Verfahren und Gerät zur Bildreproduktion mittels Grautondruck

"Write white" Druck-System mit Mehrfachzentren-Halbton-Maske

Verfahren zur Erzeugung gerasterter Halbtonbilder

Multi-stage module-width determination with selectable screen/grid-width and screen/grid-angle, involves storing grid values in threshold value matrices for comparison with color tone value of half-tone image

A digital method for providing the module width of a half-tone image with any desired screen-width (raster-width) and any desired screen-angle (raster-angle) requires that the threshold values of the second given grid, the first grid being assigned a coordinate system with x,y addresses, is stored in several threshold value matrices (10) and the threshold value read from each matrix (10) is compared with the color tone value of the half-tone image, and from the comparison result a print value for a multi-stage printing process is determined.

EINRICHTUNG ZUM ERZEUGEN EINES RASTERBILDES DURCH PUNKTWEISES ABTASTEN EINER HALBTONVORLAGE

Bildverarbeitungsverfahren und -gerät

System und Verfahren zur Konzeption von digitalen anamorphen Linienrastern

Image processing apparatus, image processing method, and program

An image processing apparatus comprises pseudo halftone processing means configured to perform processing by dithering with respect to an input image to generate a halftone image constituted by a plurality of dots, a threshold matrix used for the pseudo halftone processing comprises thresholds arranged such that dots formed 601-604 depending on a density of the input image are not rotationally symmetric on a 90° basis and their orientations differ from each other in the density region. The dots may be orientated in four different directions. The dots may be rotationally symmetric at 180°, ideally if there are an even number of pixels in each dot. The image processing apparatus may be configured to perform rotation processing with respect to the halftone image. The image processing apparatus may be a copier or printer.

HALF-TONE FACSIMILE SYSTEM

An image processing apparatus comprises an input device for inputting an image data, a first converter circuit for converting the input image signal to an analog image output and a second converter circuit for converting the input image data to a digital image output. The first converter circuit controls the analog image output in accordance with the output of the second converter circuit. The second converter circuit produces different digital signals in accordance with the input image data and has a threshold matrix to be compared with the input image data.

Halftone method employing 1 to 1 screening

Image distortion in a halftoning process is reduced by maintaining specific relationships between the halftone pattern and the phase and resolution of the input image. Tiled arrays (Figs. 4b, 5b, 6b and 8a-i) of threshold matrices can be used across the area of the image being halftoned. The pattern of the tiled arrays does not bias tone reproduction with respect to the location of the input image pixels. Moire patterns are avoided, and the reproduction of edges and image details is improved.

A method for recording a halftone picture electronically

A method for recording electronically a halftone picture for plate making is disclosed. A plurality of halftone data corresponding to a plurality of picture elements of a vignette halftone screen dot is simultaneously read out of a digital memory 21 in synchronization with digital picture signals E1 the halftone data and the picture signals are compared at 22 to obtain recording signals, and according to the recording signals a plurality of optical shutters 13 for light beams 5 for exposure of photosensitive material 4 on drum 3 are controlled to be open or closed, thereby recording a halftone picture. The number of the light beams included in a recording scanning width is selected depending on a required screen pitch, and then the selected light beams are controlled according to the recording signals. ...

A method of producing a halftone picture

A spot of light is formed upon a photosensitive material which is moved in a scanning direction, and the spot is vibrated to and fro along a vibration direction at a considerable angle to the scanning direction, and the amplitude of vibration, and the center of the vibration path, are controlled so that the spot exposes areas on the photosensitive material which form half-tone dots.

ELECTRONIC SCREENING

... 1492748 Copying by scanning PRINTING DEVELOPMENTS Inc 6 Nov 1974 [12 Nov 1973] 08437/77 Divided out of 1492747 Heading H4F The description is substantially identical to that of the parent Specification, but the claims are directed to the use of three photo-cells for determining tone density gradients.

ELECTRONIC SCREENING

... 1492747 Copying by scanning PRINTING DEVELOPMENTS Inc 6 Nov 1974 [12 Nov 1973] 47914/74 Heading H4F In a system for producing a half tone image in the form of a generally regular array of dots of a size determined by the photo-electric scanning of an original, indications of the presence and type of tone density gradients and edges in the original are obtained by comparing the outputs of additional photo-electric devices directed respectively to an area including the instantaneously scanned point, and to at least one adjacent area, and in response thereto the recorded dots are moved from their nominal positions towards the denser part of the image so that they are better aligned at tone density transitions. As described, the original and recording medium are mounted on drums for synchronous helical scanning. A line of light parallel to the drum axis is transmitted or reflected by the original to a beam splitter. One output of the splitter is sharp-masked in the fast scan direction and unsharp-masked ...

ELEKTOFOTOGRAFI IMAGING DEVICE AND PROGRAM PRODUCT OF IT FOR IMAGING

PROCEDURE FOR OFFSET AND SIMILAR PRINTING PROCESSES

PROCEDURE AND MECHANISM FOR THE PRODUCTION OF SCREENED PRINTING FORMS.

Improvements relating to halftone patterns

ELECTRONIC HALFTONE GENERATOR

ELECTRONIC HALFTONE GENERATOR Method and apparatus for scanning a document original, either black and white or color, and reproducing a corresponding halftone reproduction thereof either locally or at a remote location. A halftone signal is generated by pulse width modulating or comparing the scanned, or video, signal with a periodic signal having two frequencies and phases to create a dot pattern output which is a function of the frequency and phase of the two combined modulating signals. The halftone reproduction generated has variable dot configurations that are controllable to enable both rotation of the dot pattern (screen angle) and geometric modifications of the dot pattern. If the document original is in color, light of three different colors is caused to scan the document, each resultant video signal being processed in a manner as set forth hereinabove. In a preferred embodiment, different screen angles are utilized for each color that comprises the reproduction.

ELECTRONIC HALFTONE GENERATOR

COLOR-CONSISTENT THREE LEVEL DIFFERENTIAL GLOSS IMAGES

A method for creating a differential gloss image includes providing first and second anisotropic halftone structures. The first and second anisotropic structures have different orientations. One of the first and second anisotropic structures is applied to image data in a first region of an image to be halftoned. The other of the first and second anisotropic structures may be applied to image data in a second region of an image to be halftoned. A mixture of the first and second anisotropic structures is applied to image data in a third region of the image to be halftoned, whereby when printed, the three regions each have a gloss characteristic which differs from that of the other two regions.

HALFTONE DOT PATTERNS

HALFTONE DOT PATTERNS The dot patterns which may be used to reduce dot gain and moiré effects in halftone images involve printing areas which have inwardly curved edges and variable elongation. Colored images having screens which use these patterns may be printed with the screens at 45.degree. relative angular separations. Alternatively the dot patterns may be regarded as reversed variable oval patterns with varying elongation of the generally oval shaped non-printing areas. Figure 4b ...

APPARATUS AND TECHNIQUE FOR GENERATING A SCREEN REPRODUCTIONOF AN IMAGE

A technique for screening an image for half-tone repro- duction by image reproduction apparatus including a marking device which is operative to mark a medium along a multiplicity of parallel marking lines including the steps of providing a digital representation of density values of an original image, storing dot shape information representative of a screen function in a line-by-line, input density-by-input density arrangement and extracting the dot shape information from storage for the density values in the form of information that designates on and off points for each marking line. Apparatus for carrying out the technique is also disclosed.

METHOD AND APPARATUS FOR IMAGE REPRODUCTION

Apparatus and a technique for generating a screened reproduction of an image is disclosed. The technique includes several steps. The first step involves providing a representation of an original having input density values of the original. The second step involves storing information representing a plurality of desired dot configurations, corresponding to various possible density values. In the third step, for each coordinate pair in a given region, containing a multiplicity of coordinate pairs, a determination of whether the given region includes a part of a dot corresponding to the input density of the original is performed. In the fourth step, for regions which are determined to include a part of a dot, a determination is made whether a coordinate pair lies within the boundary coordinates of the dot. The fifth step involves operating the plotter to write only if the coordinate pair lies inside the boundary coordinates of the dot, thereby to produce the multiplicity of screen dots of ...

APPARATUS FOR GENERATING A SCREENED REPRODUCTION OF AN IMAGE

ABSTRACT A technique for generating a screened reproduction of an image is disclosed. The technique includes the steps of providing a representation of an original having input density values of the original, storing information representing a plurality of contours of desired dot configurations, corresponding to various possible density values for a multiplicity of screened dots, determining, for each coordinate pair of a plotter, whether the coordinate pair lies inside or outside of the contour of a dot corresponding to the input density value of the original and operating the plotter to write only if the coordinate pair lies inside the contour, thereby to produce the multiplicity of screen dots of sizes representing the input density values of the original. Apparatus employing the method is also provided.

PROCEDURE FOR THE PRODUCTION OF SCREENED PRINTING FORMS.

PROCEDURE AND DEVICE FOR THE PRODUCTION OF SCREENED PRINTING FORMS.

METHOD FOR PRODUCING A PARTICULAR ELEMENT ON ELECTROPHOTOGRAPHIC AND APPARATUS FOR CARRYING OUT SAID METHOD.

Photographic system of reproduction

Screen printer

An improved method of line screen printing. Instead of screening the image with only one set of lines, the image is also screened with a second set of lines, which are substantially orthogonal to those of the first set. (FIGURE 3). The screening is accomplished with two types of cells, horizonal cells and vertical cells. The pixels are classified according to their distance from the nearest line in the horizontal cells. This process is repeated tone curves, which map input pixel values to output pixel values, are associated with different pixel classifications.

METHOD FOR PRINTING A COLOUR PIXEL MATRIX ON A PHYSICAL MEDIUM BY PRINTING OBLIQUE LINES AND ASSOCIATED CONTROL DEVICE

A method is designed to allow the printing of a matrix (MPC) of pixels, in N colours defining a colour coding system, on a selected part of a physical medium (MP). That method comprises a stage in which colour pixels are printed in at least one pass along oblique lines in relation to the physical medium (MP), wherein the pixels of an oblique line are all in the same colour selected from the N colours and different from that used for the previous oblique line, in order to generate a matrix (MPC) of M horizontal lines comprising P pixels each in the N colours successively in a selected order, and wherein each horizontal line other than the first one comprises a first pixel that is identical to the second pixel of the previous horizontal line.

Apparatus and method for digital halftone reproduction

Apparatus and method of producing a halftone image reproduction of a continuous tone photograph. Scanning means is provided to scan the photograph to be reproduced along a series of scan lines. Incremental control parameters are provided in accordance with a reproduction ratio to define predetermined scan sample points for each scan line. Control means is provided for controlling the scanning means to produce successive sets of digital sharp and unsharp gray level data signals at the predetermined scan sample points proportional to the light reflected from successive concentric sharp and unsharp areas with the sharp area at each scan sample point corresponding to the general area of a predetermined portion of a halftone cell. The successive sets of digital sharp and unsharp gray level data signals are combined in accordance with a sharpness factor having a predetermined value in accordance with the original image being scanned to produce a succession of digital resultant gray level data ...

Method and apparatus for half-tone reproduction of a varying tone original image

Sequential scanned scaled density data representing a varying tone image is electronically screened to form binary element data that when imaged to form an array of orthogonally arranged binary elements on a member produces screened color separation plates of that original image suitable for use as the printing plates in a lithographic printing press. Screening occurs by comparing sequential density data with selected screen matrix data contained in a memory. The matrix data is ordered with density values increasing outwardly from the matrix center to the corners and edges. The matrix data is selected from matrix locations related to the desired screen frequency and angle with the selected matrix locations being determined by the application of fundamental right triangle trigonometric relationships to the matrix. Screening and imaging occurs sequentially with two density data being compared to matrix data simultaneously. The binary elements of the several plates are produced in one pass ...

TECHNIQUE FOR PRODUCING A FINE GRAINED DITHERED HALFTONE IMAGE HAVING AN INCREASED NUMBER OF GRAY LEVELS

Halftoning system

A method for mapping a point (pixel) outside a halftone cell to a point inside the halftone cell by determining the size of a rectangle which is tiled exactly by the halftone cell. If the size of the rectangle permits, a threshold array is employed to render the pixel. Otherwise, the pixel is rendered by calculating four potential solutions and selecting one of the four potential solutions based on the where the four potential solutions are located with respect to the halftone cell.

Multi-bit rendering method and arrangement for continuous tone picture representation and printing

A method and arrangement for reproducing an original image, scans and digitizes an original image into pixels of a digitized image. A dot template, a bit-depth, and a dot type structure are selected. A set of gray dot patterns are generated from the dot template, pixel bit-depth and dot type structure that are selected. A 4-quadrant tone reproduction on the set of gray dot patterns is then performed to produce a set of thresholding values at each pixel of the digitized image. A first signal corresponding to a gray level halftoned representation of the digitized image using the thresholding values is then produced. From the first signal, a gray level halftoned reproduction of the original image is printed.

GRAY LEVEL HALFTONE PROCESSING

An image processing method and apparatus for generating a gray level rendered pixel value that has been subjected to a halftoning process. In the method and apparatus a gray level pixel value of the pixel to be rendered by the halftoning process is provided as one input to a lookup table. A coordinate value that is determined from a pixel location in the image of the pixel to be rendered by the halftoning process is also provided as a second input to the lookup table. The first and second inputs represent an address in the lookup table of a rendered halftone value for halftone rendering of the pixel having the input gray value and the pixel location in the image.

Relief plates, platemaking masters therefor, and methods for producing such platemaking masters and plates

A relief plate, e.g., flexographic plate for printing an image, a platemaking master for producing a relief plate, and a method for producing a platemaking master. The image includes an area to be printed solid. The plate includes in the area to be printed solid a set of line pattern perforations designed to not carry ink on the plate. The line pattern perforations include at least one of the set of patterns consisting of a line screen pattern, a jagged line pattern, a wavy line pattern, a line pattern wherein the lines are not of constant thickness, a cross-hatch pattern, and a periodic pattern of circular lines. In one version, the relief plate including at least one area intended for reproducing a minimum non-zero gray-level using a first halftone pattern of dots. The platemaking master for the relief plate provides exposure in the well-regions between the halftone, such that the wells in the plate are shallower than if no exposure is provided, thereby providing for smaller halftone ...

Halftone dot patterns

The dot patterns which may be used to reduce dot gain and moiré effects in halftone images involve printing areas which have inwardly curved edges and variable elongation. Colored images having screens which use these patterns may be printed with the screens at 45° relative angular separations. Alternatively the dot patterns may be regarded as reversed variable oval patterns with varying elongation of the generally oval shaped non-printing areas.

Apparatus for generating a screened reproduction of an image

A technique for generating a screened reproduction of an image is disclosed. The technique includes the steps of providing a representation of an original having input density values of the original, storing information representing a plurality of contours of desired dot configurations, corresponding to various possible density values for a multiplicity of screened dots, determining, for each coordinate pair of a plotter, whether the coordinate pair lies inside or outside of the contour of a dot corresponding to the input density value of the original and operating the plotter to write only if the coordinate pair lies inside the contour, thereby to produce the multiplicity of screen dots of sizes representing the input density values of the original. Apparatus employing the method is also provided. ...

Method for enhanced print quality on print engines with at least one high resolution dimension

Information or data in the form of a mathematical representation of an area to be covered by a desired gray level, is sent, for example in floating point format, to a printer, e.g. a laser printer, for processing by the printer processor. The area to be covered is converted to a representation of pixels with the gray level converted to a digital value such as an eight bit value. Supercell representations with a gray level threshold matrix is provided, with each of the supercell array cells having threshold levels associated therewith whereby if the selected gray level is either above or below the threshold, one of print/no-print conditions are met for that pixel. Alternatively, if the level is the opposite and greater than a preselected range of values, the print/no-print condition will be opposite. If the gray level selected is in the direction of print, relative to the threshold level but is less than the full print level but within the range of values, then a look up table is entered ...

HALF-TONING DEVICE AND IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To actualize a screen for half-toning of large size with a small- capacity memory. SOLUTION: To actualize the screen 7 for half-toning of N×N pixel size, N gamma converting cells 10 for converting a pixel value of one pixel to a dot signal are prepared. Then the N gamma converting cells are applied repeatedly in specific order pattern (#4, #3, #5, #2, and #1) to N×N pixels so that dots are grown on an N×N pixel screen around the N growth kernels 9. COPYRIGHT: (C)2000,JPO ...

Gerät zur Erzeugung einer gerasterten Reproduktion eines Bildes

Halftone method employing 1 to 1 screening

Improvements in or relating to printing

... 1,097,735. Copying by scanning. D. J. KYTE. Sept. 16, 1965 [Sept. 23, 1964], No. 38781/64. Heading H4F. To produce a screened photographic reproduction of a monochrome or coloured original 4 an image of the face of a cathode-ray tube 11 is focused on to a sheet of moving unexposed film 13, the light spot on the face of the tube being deflected in a periodic series of patterns such that a regular array of dots are exposed on the film, the size and/or the brightness of the light spot being altered according to a photo-electric signal produced by the scanning of the original. The original 4 and unexposed film 13 are on rotating drums 1 and 2 driven by shaft 3, and the original is scanned by a light source 5 and scanning system 7, the resultant electrical signals from the photo-cells in the scanning system being fed to a computer 8 which performs the functions of contrast alteration, tonal correction, colour masking &c. The output of the computer represents a function of the optical density ...

Producing hybrid halftone images

A system (100) provides a halftone image having reduced moir’ patterns by applying a screen function of the type having a first function exhibiting symmetry about a point and a second function exhibiting symmetry about a line. In a progression of tone levels, such a screen function creates first dots (600), then lines (800), then dots (1000). For example, a screen function may include the sum of a first function of the type (1-cos(pi*(x+y))*cos(pi*(y-x))) and a second function being a piecewise linear function of x, where x,y is a coordinate location in a unit cell (506) mapped to a halftone cell (504) mapped to the image pixel grid (510). In other embodiments, a unit cell (1104) is defined on the grid by a vector. The vector has a component along an axis of the grid. The component has a noninteger length. Unit cells of the type so defined implement rational tangent angles not possible with conventional halftone cells.

ELECTRONIC SCREENING

... 1448112 Copying by scanning INTERNATIONAL PUBLISHING CORP Ltd 11 Feb 1974 [13 Feb 1973] 7116/73 Heading H4F Electronic screening apparatus generates a screened video signal representing dots, each dot being formed during a plurality of line scans, the amplitude of the received video signal being determined, either repetitively or continuously, during the formation of each dot, the screened video signal being up-dated in response to each such determination of the received video signal amplitude. In a first embodiment, Fig. 2, each dot is formed by a 4 x 16 matrix of elements (Fig. 1, not shown) the received video signal being passed to an amplitude discriminator which provides one of 60 outputs to a coding unit 2 which provides on 64 output lines the signals to produce the desired dot which are fed to four line selectors 3 (one per row of the element matrix) and thence to a row selector 4. The timing of read-out of signals from line selectors 3 and row selector 4 is controlled by a pattern ...

A device for reproducing a halftone picture by scanning

A device for reproducing a halftone picture by scanning, representing a marked simplification over conventional devices of this type. The recording beam is controlled by two deflection means and an aperture of simple shape and the control means allows dot patterns with a screen angle to be produced very simply.

HALFTONE REPRODUCTION

... 1476558 Copying by scanning LOGETRONICS Inc 21 May 1975 [15 July 1974] 21893/75 Heading H4F Half-tone reproduction apparatus comprises line-scanning means 15, with line spacing considerably less than the size of a dot in the half-tone screen, which scanning means outputs an electrical video signal to means for continuously weighting the signal with a second signal representing the position of an elemental area within a dot in the half-tone screen, and means for passing only those parts of the weighted signal above a certain threshold value. Co-ordinate transformation element 35 presents memory address signals (dependant on screen ruling and angle data input on lines 28 and 32 and horizontal and vertical sync. information on line 30) to read-only memory 34 which is pre-programmed with positional identification data for every element within the dot-matrix. This data is output to attenuator 20 so that at positions outside the area of the dot the video is so attenuated that it is not passed ...

APPARATUS FOR DIGITAL HALFTONE REPRODUCTION

PRODUCING HALFTONE DOTS

A method for producing halftone dots in a halftone plate recording apparatus

A method for producing halftone dots in a halftone plate recording apparatus is disclosed. A photosensitive material is scanned with a purality of light beams and a plurality of minute dots in lattice-like arrangement are exposed in the range of the halftone dots areas of the halftone plate. Distribution of the quantity of light beams for recording the minute dots is gradually reduced from the center to the periphery thereof, and the intensity of exposure light beams on the minute dots is controlled by the degree of conformity of the minute dots or the pattern of their arrangement with the halftone dot areas.

ELECTRONIC DEVICE FOR THE HALF-TONE GRID OF GRAPHIC COLLECTING MAINS

EQUIPMENT FOR THE PRODUCTION OF A SCREENED REPRODUCTION OF A PICTURE

ELECTRONIC DEVICE FOR THE HALF-TONE GRID OF GRAPHIC COLLECTING MAINS, WHICH SUPPRESSES MORE MOIREMUSTER, WITH USE OF TO PSEUDOCOINCIDENTAL CHARACTER SET SELECTION.

PROCEDURE FOR THE PRODUCTION OF A GREY CLAY/TONE TEMPLATE

PROCEDURE FOR THE PRODUCTION OF PHOTOGRAPHS ON ELECTROPHOTOGRAPHIC MATERIAL, IN PARTICULAR FUER THE PRODUCTION FROM PRESSURE PLATES AND DEVICE TO THE EXECUTION OF THE PROCEDURE

Methods and apparatus for dynamically soft proofing halftone images

Halftone dot patterns

SCREEN PRINTING BLOCKS

System and method for enhancing graphic features produced by marking engines

Screening method

ELECTRONIC SCREENING

GLOSSMARK IMAGE SIMULATION

A method of simulating a differential gloss image includes providing a background and a gloss effect image. The gloss effect image is configured for controlling the selective application of first and second halftones to the background image for creation of a differential gloss image when the background image is printed. A mask based on the background image is formed in which regions of mid--tone gray level are accentuated. An edge effect filter may be applied to the gloss effect image to form a filtered gloss effect image. The mask is applied to the filtered gloss effect image to generate a background modified filtered gloss effect image. The background modified filtered gloss effect image is applied to the background image to generate a representation which simulates the differential gloss image.

GLOSSMARK IMAGE SIMULATION

A method of simulating a differential gloss image includes providing a background and a gloss effect image. The gloss effect image is configured for controlling the selective application of first and second halftones to the background image for creation of a differential gloss image when the background image is printed. A mask based on the background image is formed in which regions of mid--tone gray level are accentuated. An edge effect filter may be applied to the gloss effect image to form a filtered gloss effect image. The mask is applied to the filtered gloss effect image to generate a background modified filtered gloss effect image. The background modified filtered gloss effect image is applied to the background image to generate a representation which simulates the differential gloss image.

VARIABLE ANGLE ELECTRONIC HALFTONE SCREENING

VARIABLE ANGLE ELECTRONIC HALFTONE SCREENING An electronic signal representing the density of a scanned image is electronically halftoned by combining the pictorial signal with a rectangular array of halftone screen values to form an electronic halftone image. The electronic screen function represented by the array of halftone screen values is rotated at variable angles to the original electronic image by defining a repetitive rectangular matrix representative of any predetermined halftone cell approximating a parallelogram and incorporating a shifting parameter for the repetitive rectangular matrix. An efficient, high speed, partial-dot halftoning technique is performed by indexing the screen function rectangular array, under the supervision of the shifting parameter, against the scanned image values for a realtime serial combination of the functional values.

ELECTRONIC HALFTONE SCREENING WITH HALFTONE CELLS APPROXIMATING A PARALLELOGRAM

ELECTRONIC HALFTONE SCREENING WITH HALFTONE CELLS APPROXIMATING A PARALLELOGRAM An electronic signal representing the density of pixels in a scanned line in an original image and containing pixels in whole number multiples of a single line of halftone screen partial dot values plus a predetermined extension parameter is electronically halftoned by comparing the pictorial signal with the single line of halftone screen partial dot values to form an electronic halftone image. An electronic screen function represented by the single line of halftone screen values, produces automatically a rotated halftone screen at a predetermined angle to the original electronic image when the number of pixels in the input, scanned line of the original document is set equal to a whole number multiple of the number of partialdot values plus a predetermined extension parameter. Under these conditions, the scanned input is automatically halftone screened electronically into halftone cells approximating a parallelogram ...

DIGITAL LASER PLATEMAKER AND METHOD

Method and apparatus for imaging charged electrophotographic member by electrostatic techniques using information which is derived from a source of binary data. The binary data may be achieved by imaging a pattern or may he synthesized electrically to represent that which it is desired to reproduce on the electrophotographic member. The binary data is applied to a pixel generator which is constructed and arranged to produce an output in the form of signals for driving an electro-optical deflector that in turn deflects a laser beam to form a composite of rays. The composite of rays represent the columns of a pattern to be applied to each pixel which is generated, the rows of the pixel being produced by a shaft encoder that is synchronized with the rotation of a cylinder carrying the electrophotographic member. The pixel generator produces hexagonal pixels and the pattern in each pixel represents density information derived from the binary data originally received by the pixel generator.

METHOD OF DESIGNING HALFTONE SCREENS USING NON-ORTHOGONAL SUPERCELLS

A method of constructing a halftone screen includes selecting a frequency and screen angle of interest. A subcell having spatial vectors which satisfy the selected frequency and screen angle of interest is identified. A supercell comprising an array of the subcells is formed. An integer relationship potentially having numerous solutions exists between the supercell and the subcell. The integer relationship is solved for values of the integers and then tested against the values for the subcell spatial vectors. Although the solution may in some cases be the null set, in many cases there will be numerous solutions. Each resulting solution, if any, is then tested according to any additional constraints or tolerances specified for the particular halftone screen. If any of the resulting supercell solutions satisfies the tests, that supercell may be used to create a halftone screen.

SCREEN GENERATION FOR HALFTONE SCREENING OF IMAGES

A halftone screen pattern generation system for computing halftone screened images with rotated screens including multiple angle and ruling combinations, including irrational tangent angles, is disclosed. A screen pattern is generated by storing a plurality of strips from an ideal angled screen pattern, and then concatenating a sequence comprising a selected order of the plurality of strips in a sequence. The error between the actual generated screen and ideal desired screen is computed. Each subsequent strip is selected from the plurality of strips so as to reduce the accumulated error. In one embodiment, a screen pattern is generated by storing one strip of an ideal angled screen pattern, and then concatenating a selected sequence comprising the strip and substrips of the strip. In accordance with another aspect of the present invention, the measure of error between the actual generated screen and the ideal angled screen is the length of a vector in a transformed UV space between the actual screen sample point and the idealized screen sample point. The error is determined by vector addition of the accumulated error, from strip to strip, which is added to the present error contribution from the present strip.

WEAVE FOR the INSCRIPTION Of IMAGES IN HALF-TONES

ELECTRONIC SCREENING

DEVICE OF ELECTRONIC PRODUCTION OF SCREEN OF HALF-TONES Of VARIABLE ANGLE

Laser beam producing printing blocks - synchronously scans and modulates for line and half tone structures using sawtooth pulse generator and comparator

PROCEDE ET APPAREIL DE TRAMAGE DE SIMILIGRAVURE ELECTRONIQUE

Un signal électronique représentant la densité d'éléments d'image d'une ligne analysée dans une image originale et contenant un nombre d'éléments d'image égal à la somme d'un multiple entier du nombre de valeurs de point partiel d'une unique ligne de trame de demi-teinte et d'un paramètre d'extension prédéterminé est transformé électroniquement en signal de reproduction en similigravure par comparaison du signal d'image avec l'unique ligne de valeurs de point partiel de la trame de similigravure pour former une image en demi-teintes électronique. Une fonction de trame électronique représentée par l'unique ligne de valeurs de point partiel produit automatiquement une trame de similigravure déplacée angulairement jusqu'à un angle prédéterminé par rapport à l'image électronique originale lorsque le nombre d'éléments d'image de la ligne analysée du document original est rendu égal à la somme d un multiple entier du nombre de valeurs de point partiel et d'un paramètre d'extension prédéterminé ...

PROCESS AND CONVERSION EQUIPMENT Of an ELECTRICAL SIGNAL AND THEIR APPLICATION TO the REPRODUCTION Of IMAGES

A METHOD FOR PRODUCING POINTS OF HALF-TONE IN a DEVICE Of RECORDING OF PLATES OF HALF-TONE

PROCEEDED OF CLOTHES INDUSTRY Of ONE IMITATION STEREOTYPES, INTENDS TO BE USES IN a MACHINE TO REPRODUCE IMAGES

DANS UN PROCEDE PERMETTANT DE CONFECTIONNER UN CLICHE SIMILI DIRECTEMENT A PARTIR D'UN ORIGINAL A MODELE CONTINU ET DESTINE A ETRE UTILISE DANS UNE MACHINE A REPRODUIRE DES IMAGES OU UN ORIGINAL 3 EST ENREGISTRE SUR UNE MATIERE PHOTOSENSIBLE 4 AU MOYEN D'UN CERTAIN NOMBRE DE FAISCEAUX LUMINEUX D'EXPOSITION QUI SONT MODULES INDEPENDAMMENT PAR DES SIGNAUX D'IMAGE G OBTENUS PAR BALAYAGE DE L'ORIGINAL, UNE AIRE DE POINT DE SIMILI EST DIVISEE EN ELEMENTS D'IMAGE EN FONCTION D'UN ANGLE DE TRAME PROCHE DE L'ANGLE DE TRAME DESIRE ET DONT LA TANGENTE EST UN NOMBRE RATIONNEL, DES NOMBRES FORMANT ADRESSES SONT ATTRIBUES DANS UN ORDRE PRE-ETABLI AUX ELEMENTS D'IMAGE, DES DONNEES RELATIVES A DES PROPORTIONS DE SURFACE DE POINT DE SIMILI ET A DES FORMES DE MOTIFS DE POINT DE SIMILI SONT EMMAGASINEES A DES ADRESSES DE MEMOIRES A ADRESSER PAR UNE ADRESSE COMMUNE ET L'UNE DES MEMOIRES EST SELECTIONNEE EN FONCTION DES SIGNAUX D'IMAGE, LES DONNEES ETANT LUES DANS LA MEMOIRE SELECTIONNEE ET LES FAISCEAUX LUMINEUX D'EXPOSITION ETANT COMMANDES PAR LES DONNEES LUES. IN A PROCESS FOR MAKING A SIMILI CLICHE DIRECTLY FROM AN ORIGINAL WITH A CONTINUOUS MODEL AND INTENDED TO BE USED IN A MACHINE FOR REPRODUCING IMAGES WHERE AN ORIGINAL 3 IS RECORDED ON A PHOTOSENSITIVE MATERIAL 4 IN THE AVERAGE OF A CERTAIN EXPOSURE LIGHT BEAMS THAT ARE INDEPENDENTLY MODULATED BY G IMAGE SIGNALS OBTAINED BY SCAN OF THE ORIGINAL, AN AREA OF SIMILI POINT IS DIVIDED INTO IMAGE ELEMENTS BASED ON A FRAME ANGLE CLOSE TO THE ANGLE OF DESIRED FRAME AND WHOSE TANGENT IS A RATIONAL NUMBER, NUMBERS FORMING ADDRESSES ARE ASSIGNED IN A PRE-ESTABLISHED ORDER TO IMAGE ELEMENTS, DATA RELATING TO SIMILI POINT SURFACE PROPORTIONS AND FORMS OF STITCH PATTERNS OF SIMILI ARE STORED AT MEMORY ADDRESSES TO BE ADDRESSED BY A COMMON ADDRESS AND ONE OF THE MEMORIES IS SELECTED ACCORDING TO THE IMAGE SIGNALS, THE DATA BEING READ IN THE SELECTED MEMORY AND THE BEAMS EXPOSURE LIGHTS BEING ...

PROCESS AND DEVICE Of INSCRIPTION TRAMEE BY POINTS AND LINE OF SIGNALS Of IMAGE OBTAINED BY EXPLORATION Of IMAGES HALF-TONE, WITH UND WEAVE TURNED COMPARED TO the DIRECTION Of INSCRIPTION

HALFTONE IMAGE REPRODUCTION WITH AUTOMATIC GAMMA CORRECTION

A method and apparatus for halftoning over a region of output pixels by defining large, or macro, halftone cells corresponding to regions of contiguous pixels and partitioning the macro halftone cells into smaller halftone cells. The gray, or hue, level within a macro halftone cell is determined by the number of pixels which are darkened within the macro halftone cell. Selection of the number of pixels to be darkened in response to input data can be effected in a manner to achieve automatic gamma correction. In one embodiment the pixels in each macro halftone cell are ranked according to a non-linear function.

Method of and apparatus for obtaining halftone image

Three or more conversion functions are prepared. Only a part of the conversion functions are extracted therefrom to specify provisional conversion functions. A reference solid-pixel number and imaginary solid-pixel numbers for each provisional conversion function are computed through an imaginary exposure for a quarter halftone-dot block on a scanning line. The imaginary solid-pixel numbers are computed in response to new image signals which are obtained by converting an image signal through the respective provisional conversion functions. Then, each of the imaginary solid-pixel numbers is compared with the reference solid-pixel number, thereby a most-approximate conversion function, which gives a solid-pixel number most approximate to the reference solid-pixel number, is selected among the conversion functions. An exposure control signal is generated by comparing an image signal which is obtained by converting the image signal through the most-approximate conversion function with a corresponding ...

Method and arrangement for producing rastered color separations and printing forms

A method and an arrangement for producing rastered printing forms having rasters with arbitrary raster angles on the basis of at least one recording beam moving across a recording medium. The recording beam is switched on or, respectively, off corresponding to the size and position of raster dots. A switch signal for the recording beam is generated by a signal comparison between the image signal, which represents the tonal values of an original, and stored raster thresholds, which represent the periodic basic structure of a raster mesh. Coordinate increments corresponding to the proceeding recording are accumulated dependent on the screen angle to form coordinate values. A plurality of most significant binary places of the coordinate values form addresses for reading out the stored raster thresholds. Random numbers are superimposed on the coordinate values.

Multiple layer cluster dither matrix for reducing artifacts in printed images

A technique for reducing image artifacts is described. The technique includes utilizing a clustered-dot dither matrix having a plurality of layers with each of the layers arranged in one of a plurality of complementary patterns within the dither matrix. By using a dither matrix which generates layers of dots in complementary patterns, image banding artifacts and ink bleeding characteristics resulting from a printer generating a halftone image using a clustered-dot dithering technique are reduced.

Systems and methods for designing zero-shift supercell halftone screens

Conventional design tools were not developed for designing square zero-shift supercells. Conventionally, solutions that enable square zero-shift supercells were found by trial and error or by exhaustive analysis. According to a first design criterion of this invention, a non-square supercell in a first frame of reference has a diagonal that is equal in length to the diagonal of a square supercell in a second frame of reference rotated at a desired screen angle to the first frame of reference. The screen angle is a function of the lengths of the sides of the non-square supercell in the first frame of reference. According to a second design criterion, if the area of the corresponding square supercell in the second frame of reference is an integer, a square zero-shift supercell can be designed based on the lengths of the sides of the non-square supercell in the first frame of reference.

Tile map based multi-level supercell screening

This invention is a screening method. The input image is divided into a plurality of supercells. These supercells are divided into a plurality of individual cells. An expanded cell is defined larger than each of the individual cells. A map of an input gray scale tone to an output gray scale tone is defined for each pixel of the expanded cell. The screening takes place for each pixel of the input image. First the method determines a pixel of the expanded cell corresponding to the input pixel. Then the output gray scale tone corresponding to the pixel of the expanded cell is recalled.

Halftone image recording method and apparatus

A halftone image recording apparatus has an interpolating function for interpolating previously obtained first halftone pattern data in the main scanning direction to obtain second halftone pattern data. Comparisons between input image signals and the second halftone pattern data per pixel are made to expose a photosensitive material on the basis of the results of the comparisons thereby to create a halftone plate. Through the interpolation, the recording density in the main scanning direction is increased in response to the rate of increase in pixel density.

Method and apparatus for producing rastered printed forms

A method and apparatus for producing rastered printing forms, in which an image pattern is opto-electronically scanned to obtain an image signal, and the printing form production is effected by means of an energy beam recording device controlled by the image signal, whereby the raster points are recorded in a raster network having arbitrary raster angles, by means of relative motion between the printing form and the recording device, in which the pattern to be reproduced is scanned to simultaneously provide image signals for a plurality of adjacent image points of such a pattern, following which, for the control of the recording device, the image signal of that image point is selected whose local position on the image pattern is congruent with the local position of the raster point to be presently recorded, in the formation of the desired raster angles.

System and method for estimating continuous tone values from rendered binary input

A method and system for estimating continuous tone values associated with input pixels in a color image are provided. The method includes receiving binarized halftone image data representing a color image, wherein the color image has a plurality of input pixels; and estimating the continuous tone values associated with each of the input pixels by: establishing a window comprising a pixel of interest and neighboring pixels in the binarized halftone image data, wherein the window comprises a plurality of sub-window's and wherein each sub-window has a plurality of predetermined number of rows and columns of pixels; and processing the binarized halftone image data in both a process direction and a cross-process direction using the window such that the processing is performed for one of the pixels in each of the rows within the sub-window and the processing is skipped for the remaining pixels in that row of that sub-window.

Image forming apparatus, image forming method, and storage medium storing program for forming image

An image forming apparatus includes a screen processing part that performs a screen processing on image data, a correction processing part that divides the image data subjected to the screen processing into plural regions, determines a correction parameter for each of the regions in response to a characteristic of the screen processing, and performs the correction processing, and an image formation part that forms an image based on the image data subjected to correction processing.

Method and device for controlling differential gloss of high-density areas and print item produced thereby

The invention describes a method to control differential gloss of high-density halftone areas. It is an objective of this invention to provide a method that allows producing digital watermarks on paper without being limited in area density, in the gloss properties of the toner, the paper or/and in the selected fusing technology. The present invention relates to a method producing high-density watermarks using Glossmark technology. Glossmark technology is for controlling the differential gloss of an image using the steps selecting a first halftone image having a first anisotropic structure, selecting a second halftone image having a second structure different from that of the first halftone, applying the first halftone to at least some portion of the halftone image and applying the second halftone to another portion of the halftone image.

Color-consistent three level differential gloss images

Thermal transfer image forming apparatus

A thermal transfer image forming apparatus comprises: a recording head (6) having a plurality of heating resistor elements arranged in a line; a mechanism (3,10,11) for carrying a sheet (1) of recording paper and an ink sheet (9) at a predetermined pitch; a microcomputer including an image data reading means (31) for continuously reading N-lines' pixel data (N being an integer of N 2) constituting input pixel data, a sampling means (33) for sampling the N-lines' pixel data to a matrix of N x N pixels, a gamma conversion means (34) having a first gamma characteristic conversion function for outputting print data to form main dots by performing gamma conversion proportionally in a range of from a low density to a high density, a second gamma characteristic conversion function for outputting print data being lower in density than the first gamma characteristic conversion function to form subsidiary dots, and third and fourth gamma characteristic conversion functions to form no dot in a large ...

Halftone screen density data structures and method and apparatus for utilizing the same

A plurality of halftone screen density data structures utilizing halftone dot patterns which arrays the halftone dots at preselected screen angles and at a preselected distance to create a screened halftone separation. By arraying the halftone dots at preselected screen angles, the human eye is confused into perceiving continuous patterns and is less likely to perceive any Moiré pattern than when using conventional methods. The data structures are created by arranging for every halftone dot in at least one halftone dot pattern of the data structures to be surrounded by a plurality of dots having their dot centers at preselected screen angles and at a preselected distance from the dot center of the center halftone dot. The halftone dots are superimposed over a plurality of bits arranged as a bit map which is representative of a pixel format utilized to produce screens wherein each bit in the bit map is assigned a value in a predetermined fashion. The values are utilized when binary representations ...

AN ELECTRONIC GRAPHIC ARTS SCREENER THAT SUPPRESSES MOIRE PATTERNS USING PSEUDO-RANDOM FONT SELECTION

METHOD FOR HALFTONE DOT MESHING REPRODUCTION FOR IMAGE AND SYSTEM THEREFOR

PURPOSE: To enable halftone dot meshing the reproduction of a image by making a plotter perform a write operation only when each coordinate pair of the plotter exists inside an outline. CONSTITUTION: A rotated screen exists along a certain coordinate axis, and demarcates many second cells rotated by a given angle with respect to another coordinate axis. The mesh of the rotated screen defines the sizes of cell and dot, it provides an output dot having a typical resolution of dot in an output image, so that the internal coordinates of each cell are given. Each output dot consists of many 3rd dots generated by a laser plotter 26 that moves along coordinate axes. Then, the laser plotter 26 is controlled to perform writing to all the positions inside the dot outline defined by a lookup table 22 and not to perform writing at all the positions outside the dot outline. COPYRIGHT: (C)1993,JPO ...

DOT THRESHOLD VALUE DATA GENERATING METHOD

PROBLEM TO BE SOLVED: To provide a dot threshold value data generating method by which production of tone jump can be avoided and visibility of moire stripe can be lowered in a dot image output device with low output resolution and many numbers of screen lines. SOLUTION: At least C, M and Y color versions among C, M, Y and K color versions are generated on the basis of dot threshold value data according to a condition of irrational tangent so as to avoid production of a tone jump and set a desired screen angle with high accuracy, then production of the moire stripes can be suppressed to the utmost in the case of superimposing the C, M, Y and K color versions. COPYRIGHT: (C)2003,JPO ...

HALF TONE METHOD ADOPTING ONE TO ONE SCREENING

PROBLEM TO BE SOLVED: To provide a desirable method to prevent production of artifact by minimizing distortion of an image through half-toning processing because aliasing in the half-toning processing causes distortion in image contents such as loss of sharpness, production of moire and deteriorated image noise. SOLUTION: The method of this invention includes a step (1) where a set of scaled matrix values is generated to each of source pixels and a step (2) where a set of scaled target pixels is generated on the basis of a confirmative half-tone relation between the source pixels and each of sets of the scaled matrix values. Then the step (2) is repeated by arranging a set of the scaled matrix values to all the source pixels so as to generate a confirmative half-tone pattern denoting a desired repetitive pattern. COPYRIGHT: (C)2001,JPO ...

Amplification Modulation Screening Method And Apparatus

An amplitude modulation screening method is provided. The method comprises a step of utilizing regular hexagon screen dots to form a threshold matrix for amplitude screening. In embodiments of the present application, an amplitude modulation screening apparatus is also provided. The apparatus may comprise a matrix module configured to constitute a threshold matrix for amplitude screening using regular hexagon screen dots. Due to the threshold matrix formed with regular hexagon screen dots, the method and apparatus of the present application resolve the problem of the screen dots in the prior art, and improve the printing quality.

MEMORY DEVICE COMPRISING COEFFICIENTS FOR HALFTONING

In some examples, a printing device component includes a memory device comprising compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table. The memory device further includes healing parameter values specifying a healing process to apply to a reconstructed halftone table produced using the coefficients. 1. A printing device component comprising: compressed coefficients that, when decompressed by a printing device, form difference entries, wherein a difference entry of the difference entries represents a difference of a value of a corresponding entry of a halftone table and a value of a corresponding entry of a reference table; and', 'healing parameter values specifying a healing process to apply to a reconstructed halftone table produced using the coefficients,, 'a memory device comprisingwherein the coefficients and the healing parameter values are accessible by the printing device to reconstruct a halftone table used in halftone printing by the printing device.2. The printing device component of claim 1 , wherein the memory device further comprises a minimum pulse width modulation (PWM) value for a pixel claim 1 , and a maximum pulse width modulation (PWM) value for a pixel.3. The printing device component of claim 2 , wherein the healing parameter values specify use of one or both of the minimum PWM value and the maximum PWM value by the healing process.4. The printing device component of any preceding claim claim 2 , wherein the healing process specified by the healing parameter values enforces monotonicity in an increase in PWM values for controlling a pixel.5. The printing device of any preceding claim claim 2 , wherein the memory device further comprises geometry information defining a halftone cell.6. The printing device component of ...

Recording data generating apparatus, image recording apparatus, recording data generating method and storage medium

There is provided a recording data generating apparatus that generates recording data used for reproducing a gloss of an image by recording inclined structures on a recording medium, the recording data generating apparatus including: a conversion unit that converts gloss data with a first resolution having an inclined structure as one pixel into inclined structure data representing a combination ratio of a predetermined number of kinds of inclined structures; a halftone processing unit that generates N-value quantization data representing one of the predetermined number of kinds of inclined structures by performing a halftone process of the inclined structure data of each pixel with the first resolution, N being equal to the predetermined number of kinds; and a recording data generating unit that generates recording data used for recording one of the predetermined number of kinds of inclined structures for each pixel with the first resolution based on the quantization data.

IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND PROGRAM

An image processing apparatus which performs image processing for print processing, including: a pseudo halftone processing unit configured to perform pseudo halftone processing by dithering with respect to an input image, and generate a halftone image constituted by plural dots, and a threshold matrix holding unit configured to hold a threshold matrix used for the pseudo halftone processing, wherein in the threshold matrix, thresholds are arranged such that the halftone image has a density region in which dots to be formed depending on a density of the input image are not rotational symmetric on a 90° basis, and orientations of the dots differ from each other in the density region. 1. An image processing apparatus which performs image processing for print processing , comprising:a halftone processing unit configured to perform halftone processing by dithering with respect to an input image, and generate a halftone image constituted by plural dots, anda threshold matrix holding unit configured to hold a threshold matrix used for the halftone processing.2. A method for performing halftone processing by dithering with respect to an input image , and generating a halftone image constituted by plural dots , whereinin a threshold matrix used for the halftone processing, thresholds are arranged such that the halftone image has a density region in which dots to be formed depending on a density of the input image are not rotational symmetric on a 90° basis.3. A non-transitory computer readable storage medium storing a program for causing a computer to perform a method for controlling an image processing apparatus which performs halftone processing by dithering with respect to an input image , and generates a halftone image constituted by plural dots , the control method comprising the steps of;in a threshold matrix used for the halftone processing, thresholds are arranged such that the halftone image has a density region in which dots to be formed depending on a density of ...

HALFTONE SCREENS

A method comprises forming a halftone screen set comprising first, second and third halftone screens. A first regular halftone screen for the screen set is selected. A second regular halftone screen is determined, using a processor, by performing a regularity invariant transformation on the first regular halftone screen. A third halftone screen is determined based on at least one predetermined condition being satisfied between the first, second and third halftone screens. 1. A method comprising:selecting a first regular halftone screen;determining a second regular halftone screen, using a processor, by performing a regularity invariant transformation on the first regular halftone screen; anddetermining a third halftone screen to form a halftone screen set comprising the first screen, the second screen and the third screen, wherein the third halftone screen is determined based on at least one predetermined condition being satisfied between the first, second and third halftone screens.2. The method according to wherein the regularity invariant transformation performed on the first regular halftone screen to determine the second regular halftone screen is a rotation by an angle of 90 degrees minus twice the screen angle of the first regular halftone screen.3. The method according to wherein selecting the first halftone screen comprises iterating over a plurality of screens until a screen is found having a regularity index equal to 1 and having a number of lines per inch within a predetermined range.4. The method according to wherein the third halftone screen is determined based on a condition that each of a plurality of moiré frequencies between the first claim 1 , second and third halftone screens is above a predetermined threshold.5. A method according to wherein the third halftone screen is determined based on a computed regularity index of the third halftone screen being less than or equal to a predetermined threshold.6. A method according to wherein the third ...

Halftone screens

In an example, a halftone screen is generated. A plurality of amplitude-modulated dot clusters is arranged in correspondence with a grid. Each of the amplitude-modulated dot clusters comprises a plurality of frequency-modulated dots.

Image processing apparatus, image processing method, and program

An image processing apparatus which performs image processing for print processing, including: a pseudo halftone processing unit configured to perform pseudo halftone processing by dithering with respect to an input image, and generate a halftone image constituted by plural dots, and a threshold matrix holding unit configured to hold a threshold matrix used for the pseudo halftone processing, wherein in the threshold matrix, thresholds are arranged such that the halftone image has a density region in which dots to be formed depending on a density of the input image are not rotational symmetric on a 90° basis, and orientations of the dots differ from each other in the density region.

HALFTONE IMAGE CREATION

Example implementations relate to halftone image creation. An example non-transitory machine-readable medium can include instructions executable to determine a highlight core shape and a shadow core shape of a microcell within a supercell. The instructions can be executable to determine growth sequences for a plurality of pixels within the highlight core and the shadow core and between the microcell and other microcells within the supercell, divide each of the plurality of pixels into a plurality of subpixels, and create a halftone image for an unequal resolution printing device using a constrained direct binary search model and based on the highlight core shape, shadow core shape, growth sequences, and the plurality of subpixels. 1. A non-transitory computer readable medium containing instructions executable by a processing resource to cause the processing resource to: 'wherein the microcell comprises a plurality of pixels;', 'determine a highlight core shape and a shadow core shape of a microcell within a supercell,'}determine growth sequences for the plurality of pixels within the highlight core and the shadow core and between the microcell and other microcells within the supercell;divide each of the plurality of pixels into a plurality of subpixels; andcreate a halftone image for an unequal resolution printing device using a constrained direct binary search (DBS) model and based on the highlight core shape, shadow core shape, growth sequences, and the plurality of subpixels.2. The medium of claim 1 , further comprising the instructions executable to cause the processing resource to simulate the unequal resolution of the printing device using the plurality of subpixels.3. The medium of claim 1 , wherein the constrained DBS model comprises a constrained circular convolution DBS model.4. The medium of claim 1 , wherein the constrained DBS model comprises a DBS model constrained by a centroid rule.5. The medium of claim 1 , wherein the constrained DBS model ...

IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND STORAGE MEDIUM

An image forming apparatus in which a lighting position of a dot to be firstly generated by screen processing is changed, in a vertical direction, between a first sub-matrix and a second sub-matrix that are included in a dithering matrix and that are adjacent to each other in a lateral direction, in order not to generate a region where no dot exists in a main scanning direction. 1. An image forming apparatus comprising:a screen processing unit configured to perform screen processing on image data based on a result of comparison between a value of a pixel in the image data and a threshold of a dithering matrix corresponding to the pixel; anda determination unit configured to determine whether a pixel of interest is included in a halftone image in the image data having been subjected to the screen processing by the screen processing unit, based on a pixel value in a region having a predetermined length in a lateral direction from the pixel of interest,wherein the dithering matrix includes a plurality of sub-matrices,wherein out of the plurality of sub-matrices, a first sub-matrix and a second sub-matrix that have a same number of pixels in a vertical direction and in the lateral direction are adjacent to each other in the lateral direction,wherein a threshold at a growth center in the first sub-matrix and a threshold at a growth center in the second sub-matrix are located at different positions in the vertical direction, andwherein the predetermined length is larger than that corresponding to the number of pixels in the lateral direction of the first sub-matrix.2. The image forming apparatus according to claim 1 , wherein a threshold secondly growing in the first sub-matrix and the threshold at the growth center in the second sub-matrix are located at a same position in the vertical direction in the dithering matrix.3. The image forming apparatus according to claim 1 , wherein the threshold at the growth center and a threshold secondly growing in the first sub-matrix ...

IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND STORAGE MEDIUM

An image processing apparatus including: a halftone processing unit configured to generate halftone image data represented by a halftone dot corresponding to a density value by performing halftone processing using a dither matrix for input image data; a phase change processing unit configured to correct a deviation of a laser beam scan line that is used in forming an image in accordance with the input image data on a printing medium by performing phase change processing to shift the phase of a pixel in the halftone image data in a sub scanning direction; and a pseudo high-resolution processing unit configured to convert the halftone image data after the phase change processing into halftone image data with a lower resolution by performing pseudo high-resolution processing, and in the dither matrix, threshold values are arranged so that the number of pixels in the sub scanning direction, which make up the halftone dot, is always even. 1. An image processing apparatus comprising:a halftone processing unit configured to generate halftone image data represented by a halftone dot corresponding to a density value by performing halftone processing using a dither matrix for input image data;a phase change processing unit configured to correct a deviation of a laser beam scan line that is used in forming an image in accordance with the input image data on a printing medium by performing phase change processing to shift a phase of a pixel in the halftone image data in a sub scanning direction; anda pseudo high-resolution processing unit configured to convert halftone image data after the phase change processing into halftone image data with a lower resolution by performing pseudo high-resolution processing, whereinin the dither matrix, threshold values are arranged so that a number of pixels in the sub scanning direction, which make up the halftone dot, is always even.2. The image processing apparatus according to claim 1 , whereinin the halftone image data after the pseudo ...

IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

An image processing apparatus includes processing circuitry. The processing circuitry is to acquire image data including primary color image data for primary color and spot color image data for spot color; generate primary color halftone data representing the primary color image data as a group of halftone dots, using a primary color screen specifying cyclic arrangement of lines of halftone dots; and generate spot color halftone data representing the spot color image data as a group of halftone dots, using a spot color screen having a second phase that is different from a first phase represented by the cyclic arrangement of lines specified in the primary color screen.

Image forming apparatus, image forming method, and storage medium

An image forming apparatus comprises an output unit to output output data converted from input data by a halftone process with a first or second matrix in accordance with attribute information on pixels of the input data. The thresholds in the first matrix, whose thresholds are arranged to express the tone level of output data by the number of dots or dot area modulation for input data, and the second matrix, whose thresholds are arranged to express the tone level of output data by dot area modulation for the input data, are arranged such that the average dot size of output data obtained by the halftone process with the second matrix on input data with the first density is smaller than the average dot size of output data obtained by the halftone process with the first matrix on the input data with the first density.

ROSETTE-FREE PRINTING

In an example implementation, a method of rosette-free printing includes, in a printing device whose color plane misregistration is less than 15 percent of a screen ruling of a halftone screen, printing multiple color planes of a multicolor image using the halftone screen. 1. A method of rosette-free printing comprising:in a printing device whose color plane misregistration is less than 15 percent of a screen ruling of a halftone screen, printing multiple color planes of a multicolor image using the halftone screen.2. A method as in claim 1 , wherein printing multiple color planes of a multicolor image using the halftone screen comprises:printing a first color plane with a first screen that has a first screen ruling and a first screen angle; andprinting a next color plane with a second screen having the first screen ruling and the first screen angle.3. A method as in claim 1 , wherein printing multiple color planes of a multicolor image using the halftone screen comprises:printing first dots of a first color plane using the halftone screen; and,printing second dots of a second color plane directly on top of the first dots using the halftone screen.4. A method as in claim 1 , wherein printing multiple color planes of a multicolor image using the halftone screen comprises:printing first dots of a first color plane using the halftone screen; and,printing second dots of a second color plane at locations that are shifted from locations of the first dots using the halftone screen.5. A method as in claim 1 , wherein printing multiple color planes of a multicolor image using the halftone screen comprises:printing first dots of a first color plane in a first order using the halftone screen; and,printing second dots of a second color plane in a second order using the halftone screen.6. A printer for rosette-free printing comprising:a stable color registration print engine;a screen generator to create a halftone screen; anda screen manager to use the halftone screen for ...

METHOD FOR PRINTING A COLOUR PIXEL MATRIX ON A PHYSICAL MEDIUM BY PRINTING OBLIQUE LINES AND ASSOCIATED CONTROL DEVICE

A method designed to allow the printing of a matrix (MPC) of pixels, in N colours defining a colour coding system, on a selected part of a physical medium (MP). That method comprises a stage in which colour pixels are printed in at least one pass along oblique lines in relation to the physical medium (MP), wherein the pixels of an oblique line are all in the same colour selected from the N colours and different from that used for the previous oblique line, in order to generate a matrix (MPC) of M horizontal lines comprising P pixels each in the N colours successively in a selected order, and wherein each horizontal line other than the first one comprises a first pixel that is identical to the second pixel of the previous horizontal line. 1. A method for printing a matrix (MPC) of M*P pixels in N colours defining a colour coding system on a selected part (PC) of a physical medium (MP) , comprising a stage during which colour pixels are printed in at least one pass along oblique lines in relation to said physical medium , wherein the pixels of an oblique line are all in the same colour selected from said N colours , different from that used for the previous oblique line , in order to generate a matrix (MPC) of M horizontal lines comprising P pixels each in said N colours successively in a selected order , with the possible repetition of said order when P is greater than N , and wherein each horizontal line other than the first one comprises a first pixel that is identical to the second pixel of the previous horizontal line.2. A method according to claim 1 , further comprising a preliminary stage wherein said physical medium (MP) is turned by a selected angle so as to make up the matrix (MPC) along oblique lines slanted to said selected angle claim 1 , where all the pixels in each of them are in the same colour.3. A method according to any of or claim 1 , wherein said printing is carried out using the ink jet process.4. A method according to any of or claim 1 , wherein ...

HALFTONE SCREENS ASSOCIATED WITH MOIRÉ EFFECTS BELOW A THRESHOLD

In an example, a method includes determining, using a processor, a set of halftone screens each comprising tiles spanning a plurality of cells, wherein at least one screen is a non-orthogonal screen and the cells comprise parallelograms being defined by a first vector having a first length and second vector having a second length. A first and a second fundamental frequency may be determined for each of the screens using a projection of the first and of the second vector into each axis of a print apparatus reference frame, the first length and the second length. Using the first and second fundamental frequencies, it may be determined which screens are associated with moiré effects below a threshold. 1. A method comprising:determining, using a processor, a set of halftone screens each comprising tiles spanning a plurality of cells, wherein at least one screen is a non-orthogonal screen and the cells comprise parallelograms being defined by a first vector having a first length and second vector having a second length;determining, using a processor, for each of the screens, first and second fundamental frequencies using a projection of the first and of the second vector into each axis of a print apparatus reference frame, the first length and the second length; anddetermining, using a processor and the first and second fundamental frequencies, which screens are associated with moiré effects below a threshold.2. A method according to wherein determining the first fundamental frequency comprises using the first length and the projections of the first vector into the axes of the print apparatus reference frame and determining the second fundamental frequency comprises using the second length and the projections of the second vector into the axes of a print apparatus reference frame.4. A method according to wherein determining the first and second fundamental frequencies comprises multiplying each projection of the first vector by a first factor to provide a first non- ...

Halftone image recording method

Variable glossmark

The present invention relates to the segmentation of an image into a main area and a image segment for variable glossmark data. By selectively applying halftones with anisotropic structure characteristics which are significantly different in orientation while remaining identical in density to the image segment, a variable glossmark may be superimposed within an image with reduced processing and storage requirements.

Screen system used to produce halftone picture

(57)【要約】 【課題】 本発明は黒から白までのグレーシェードレン ジ又は色分解を含む連続調画像シミュレーション手段を 提供するデジタル化された画像について用いるアルゴリ ズムの提供を目的とする。 【解決手段】 本発明の中間調画像再生に用いられるス クリーン装置は、各々１つの印刷色に対応する少なくと も２枚の部分的スクリーンと、点の集合により規定され たドットの列及び行により規定されており該ドットは前 記多色印刷の色調値のための印刷ドットを規定される各 部分スクリーンと、互いに幾何学的に直交せず、行間間 隔が列間間隔と同じ寸法でないような列と行を有する少 なくとも１枚の前記部分スクリーンと、を含み、ドット の中心が中間調セルアレイ内のアドレス可能な点の上に 直接存在せずに、構成される。

Method of producing halftone copied matter

Halftone image forming method

Halftone image recording method and apparatus

Halftone dot recording device

Method for screening color separations of a lenticular image and method for producing a lenticular image on a printing material

本发明涉及一种用于通过观察光栅图像所需的光栅透镜(10)的光栅频率对该光栅图像的分色加网的方法。对于这些分色中的每一个在一个加网角度下通过一个加网频率计算调幅加网图像，其中，该加网角度的正切是有理数。对于一个确定的分色确定一个以相对于该光栅图像的图像条垂直的方向为参考的加网角度，确定一对整数(n，m)，这对整数的商(m/n)等于该加网角度的正切，计算出该分色的加网频率作为该光栅频率与这两个整数的平方和的平方根的乘积。为了在承印物上制造光栅图像，按照该方法计算出的分色可分别在一个印版上曝光并且经曝光的印版在一个印刷机中套印地在承印物上印刷，由此，在该承印物上形成一个多色的光栅图像。

Address generating method of dot generator

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Dither image processing method

내용 없음. No content.

Multi-tone recording method

Method of and apparatus for recording half tone images and halfton images produced thereby

내용 없음. No content.

Signal processing method

Multiple stage rasterization with rasters of any raster width and raster angle

讲述一种利用具有任意网格宽度和任意网格角度的网格(6)而对半色调图像进行数字式多级扫描的方法，其中，通过读出阈值和将所读出的阈值与半色调图像的色调值相比较来进行扫描。为此采用一些阈值矩阵，其中的阈值代表给定的网格(3)的一个或多个网目点，用该给定的网格(3)近似所希望的网格宽度和所希望的网格角度。在读出所述的阈值期间求出所希望网格(6)和给定的网格(3)的坐标之间的误差，一旦所述的误差超出给定的极限值，则通过修正阈值矩阵的读出地址来补偿所述的误差。也可以采用印刷值矩阵来代替阈值矩阵，在该印刷矩阵中存储了对于一个色调值适用的要印刷的印刷值分布。

Dot screen forming method

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Halftone screens

In an example, a halftone screen is generated. A plurality of amplitude-modulated dot clusters is arranged in correspondence with a grid. Each of the amplitude-modulated dot clusters comprises a plurality of frequency-modulated dots.

METHOD AND APPARATUS FOR CONVERTING AN ELECTRIC SIGNAL AND THEIR APPLICATION TO IMAGE REPRODUCTION

METHOD FOR FORMING AN IMAGE ON AN ELECTROPHOTOGRAPHIC MEMBER AND APPARATUS FOR USE THEREOF

L'INVENTION CONCERNE UN APPAREIL POUR FORMER UNE IMAGE SUR UN ORGANE ELECTROPHOTOGRAPHIQUE, AU MOYEN D'UN FAISCEAU D'ENERGIE RAYONNANTE. SELON L'INVENTION, UN DISPOSITIF 122 MODULE ET DEVIE LE FAISCEAU ET LE DIVISE EN RAYONS 36, DIRIGES SUR L'ORGANE ELECTROPHOTOGRAPHIQUE 38, ET UN MOYEN 26 FORME DES ELEMENTS D'IMAGE D'ELEMENTS CHARGES ET DECHARGES SUR L'ORGANE 38, LES ELEMENTS CHARGES POUVANT REPRODUIRE LES INCREMENTS D'UNE IMAGE GRAPHIQUE AYANT UNE CERTAINE DENSITE, ET LES ELEMENTS DECHARGES REPRODUISANT LE FOND BLANC. L'INVENTION S'APPLIQUE NOTAMMENT A LA PREPARATION DE PLAQUES D'IMPRESSION POUR LITHOGRAPHIE. THE INVENTION RELATES TO AN APPARATUS FOR FORMING AN IMAGE ON AN ELECTROPHOTOGRAPHIC ORGAN, BY MEANS OF A RADIANT ENERGY BEAM. ACCORDING TO THE INVENTION, A DEVICE 122 MODULATES AND BECOMES THE BEAM AND DIVIDES IT INTO RAYS 36, DIRECTED ON THE ELECTROPHOTOGRAPHIC BODY 38, AND A MEANS 26 SHAPES IMAGE ELEMENTS OF CHARGED AND UNLOADED ELEMENTS ON THE BODY 38, THE LOADED ELEMENTS THAT CAN REPRODUCE THE INCREMENTS OF A GRAPHIC IMAGE HAVING A CERTAIN DENSITY, AND THE LOADED ELEMENTS REPRODUCING THE WHITE BACKGROUND. THE INVENTION APPLIES IN PARTICULAR TO THE PREPARATION OF PRINTING PLATES FOR LITHOGRAPHY.

Method for setting frequency rate and angle difference between screens in which does not generate moire pattern

모아레 패턴이 발생하지 않는 스크린간의 주파수 비율 및 각도 차이 설정방법이 개시된다. 본 발명에 따른 스크린의 주파수 비율 및 각도 차이 설정방법은 중첩된 두개 이상의 스크린을 이용하여, 이진영상을 형성하는 단계, 이진영상을 저주파 통과 필터링(low pass filtering)하여, 평균반사도를 산출하는 단계, 산출한 평균반사도를 이용하여, 이진영상에 대한 주파수 성분(cost)을 산출하는 단계, 그리고, 주파수 성분에 기초하여, 이진영상에 대한 모아레(moire) 패턴 발생여부를 판단하는 단계 포함한다. 이에 따라 모아레 패턴이 발생하지 않는 이진영상을 형성할 수 있게 된다. A method of setting a frequency ratio and an angle difference between screens in which a moiré pattern does not occur is disclosed. The method for setting the frequency ratio and angle difference of the screen according to the present invention comprises the steps of: forming a binary image using two or more overlapping screens; low pass filtering the binary image to calculate an average reflectance; Calculating a frequency component of the binary image using the calculated average reflectivity, and determining whether a moire pattern is generated for the binary image based on the frequency component. Accordingly, it is possible to form a binary image in which the moiré pattern does not occur. 스크린(screen), 모아레(moire), 이진영상, 평균분산도, 주파수 성분, 인-페이즈(in-phase), 카운터-페이즈(counter-phase), 슬라이틀리 오프(slightly off), 싱귤러(singular), 스테이블(stable) Screen, moire, binary image, average variance, frequency component, in-phase, counter-phase, slitly off, singular , Stable

Engraving method and apparatus for engraving an engraving area using a molding signal

(57)【要約】 シリンダ（１４）の表面に多数のセルを彫刻する方法及び装置である。この方法及び装置は、複数の画像データの処理することに関し、画像データの少なくとも一部分を修正し、修正された画像データに応じた信号を発生する。次いで、彫刻領域のパターンを彫刻するために、信号に応じて彫刻デバイス（２２）を起動する。この方法及び装置は、前記複数の彫刻領域の少なくとも１つの特性と前記複数の彫刻領域のその他の１つの特性と、例えば、彫刻領域に不規則な間隙を与えるて、変化させるために、複数の彫刻領域の少なくとも１つの特性を容易に修正する。この方法及び装置は、望ましい形状を持つ彫刻領域を作成するため、彫刻される領域に相当する画像データの修正に用いられる成形信号を発生させるため成形信号発生器を提供している。

IMAGE PROCESSING APPARATUS

High resolution halftone dot generator system including led array

ABSTRACT OF THE DISCLOSURE A dot generator system is provided wherein an LED microchip array having staggered rows of LED's imaged onto the surface of a rotating exposure drum is controlled to create a multiple exposure beam microdot image on the drum surface in a microdot line by microdot line and scanline by scanline exposure scan. Picture values are compared to microdot density values recalled from a dot density profile array using address values incremented with microdot, flyback and scanline increment values in order to produce exposure data bits indicating whether each active LED on the array is to be turned on. Exposure data bits are accumulated into an exposure data word equal in length to the number of active LED's on the LED array and stagger compensation time delays are applied to exposure bits corresponding to the second and subsequent staggered LED rows to create a timed microdot line exposure on the drum surface.

Method of making colour-separation arrays for reproducing colour images

Halftone tiling and halftoning for annular rasters

An aspect of the present disclosure provides a halftoning method for annular rasters comprising: using annular rasters with uniformly spaced raster lines and uniformly spaced pixels within the raster lines; angularly tiling wedge shaped halftone cells around at least a partial circumferential print medium wherein an integer number of wedge tiles fills a disc space; wherein the annular rasters are considered in arcs and wherein pixel thresholds in the wedge shaped halftone cells are considered in arcs so as to conform to the annular rasters upon tiling the wedge shaped halftone cells; and, setting the number of pixel thresholds in each arc raster of the cell to an integer value near a desired writing resolution to enable seamless tiling wherein the number of thresholds increase as a function of a wedge cell radius.

Gray level halftone processing

An image processing method and apparatus for generating a gray level rendered pixel value that has been subjected to a halftoning process. In the method and apparatus a gray level pixel value of the pixel to be rendered by the halftoning process is provided as one input to a lookup table. A coordinate value that is determined from a pixel location in the image of the pixel to be rendered by the halftoning process is also provided as a second input to the lookup table. The first and second inputs represent an address in the lookup table of a rendered halftone value for halftone rendering of the pixel having the input gray value and the pixel location in the image.

Imaging by varying the placement of elements in the pixels

A digital laser platemaker for imaging an electrophotographic member by electrostatic techniques using information which is derived from a source of binary data. The binary data may be achieved by scanning a pattern or may be synthesized electrically to represent that which it is desired to reproduce on the electrophotographic member. The binary data is applied to a pixel generator which is constructed and arranged to produce an output in the form of signals for driving an acusto-optic deflector that in turn deflects a laser beam to form a composite of rays. The composite of rays represent the columns of a pattern to be applied to each pixel which is generated, the rows of the pixel being represented by the output of a shaft encoder that is synchronized with the rotation of a cylinder carrying the electrophotographic member. The pixel generator produces hexagonal pixels and the pattern in each pixel represents density information derived from the binary data originally received by the pixel generator. The patterns in the pixels are arranged to prevent undesirable moire effects. The electrophotographic member receives the composite rays from a carriage which moves in synchronism with the rotation of the cylinder and the rate at which the composite rays are applied. The resulting latent image is toned and fused on the cylinder. Thereafter it may be used as the printing plate after certain processing.

Method of generating halftone threshold data

Dot cells are made up of halftone threshold data of color images of C, M, Y, K. At least the dot cells of color images of C, M, K are set under the condition of a non-rational tangent. Halftone screen periods and screen angles of said three color images of C, M, K are set such that a period and an angle of a primary moiré pattern produced when two of the three color images of C, M, K are superposed are substantially equal to a halftone screen period and a screen angle of the remaining one of the three color images of C, M, K. A halftone image is generated using dot cells thus produced.

Method of and apparatus for recording halftone images and halftone images produced thereby

A printed image (I t4 ) is produced with halftone images for respective color printers while so-called rosette moire and a color shift from an original image are prevented. Halftone dots (H m4 , H c4 , H k4 ) are formed in linear shapes extending in respective prescribed directions, thereby forming parallel lines with respective intervals (d m4 , d c4 , d k4 ). These extensional directions and intervals of parallel lines are so established that they effectively prevent the rosette moire and the color shift.

System and method for producing color shifting or gloss effect and recording medium with color shifting or gloss effect

An ultraviolet image pattern and a gloss effect pattern are created on a recording medium having florescence properties and being a first color by electronically creating a first electronic pattern ink, the first electronic pattern ink including a second color, holes, and a first pattern, the holes representing areas in the first electronic pattern ink wherein the second color is absent; electronically creating a second electronic pattern ink, the second electronic pattern ink including the second color, holes, and the first pattern, the holes of the second electronic pattern ink representing areas in the second electronic pattern ink filled with a third color, the third color being equal to the first color; electronically creating an electronic image region having a background and a foreground; electronically painting, using the first electronic pattern ink, the background of the electronic image region; electronically painting, using the second electronic pattern ink, the foreground of the electronic image region; and rendering, using marking materials, the electronic image region on a recording medium such that only the florescence properties of the recording medium are only visible through the holes when viewing the recording medium using ultraviolet illumination and such that the electronic image region is visible when a relative angle between an observer's viewing angle and an angle of illuminating the recording medium by an illumination source is a first angle, the electronic image region not having the predetermined portion of the holes painted with the third color being not visible when the relative angle between the observer's viewing angle and the angle of illuminating the recording medium by the illumination source is a second angle, the second angle being not equal to the first angle.

Methods of assigning pixels to cells of a halftone grid

Patent FR2084832A5

Method of generating a threshold matrix for producing a color separation, the matrix having a varied intensity distribution, method of reproducing a color image using the threshold matrix, apparatus for producing the color separation, and the threshold matrix

Threshold matrixes for a C-separation and an M-separation of main colors are used to convert a continuous-tone image subjected to color separation into dot patterns for the C-separation and the M-separation. The dot patterns are binary images in which no screen ruling or screen angle is defined. Then, a color image is reproduced by overlaying the dot patterns for the C-separation and the M-separation. When the dot patterns for the C-separation and the M-separation are converted into patterns in the frequency domain, main frequency components obtained by the conversion have a substantially-constant predetermined pattern frequency for all angles, and the intensity distribution of the main frequency components is varied based on the C-separation and the M-separation.

Method of forming halftone image

METHOD AND ARRANGEMENT FOR THE PRODUCTION OF GRID ANGLE IN DIGITAL PRINTING TECHNOLOGY

Patent DE3320691C2

Halftoning with uniformly dispersed dot placement

In general, in one aspect, the invention features a method for reproducing a contone image as a halftone image on a recording medium, using threshold values in a threshold matrix, including the steps of providing a base supercell suitable for periodically tiling a plane, which has a plurality of microdots and a plurality of virtual halftone dot centers; assigning an ordering sequence consisting of a series of numbers on the virtual halftone dot centers in the base supercell; assigning threshold values to microdots in response to the ordering sequence thereby generating the threshold matrix in the base supercell; and using the threshold matrix in combination with the contone image to generate a screened halftone image on the recording medium. The step of assigning an ordering sequence includes: (i) assigning a first number in the ordering sequence to a first virtual halftone dot center in the base supercell; (ii) assigning a second consecutive number in the ordering sequence to a second virtual halftone dot center in the base supercell; (iii) calculating a value of an aggregate distance function for each virtual halftone dot center in the base supercell not already included in the ordering sequence; (iv) selecting a next virtual halftone dot center in the base supercell in response to the calculated aggregate distance function, the next virtual halftone dot center having one of the least values of the calculated aggregate distance function; (v) assigning the next consecutive number in the ordering sequence to the selected next virtual halftone dot center in the base supercell; and then repeating steps (iii), (iv), and (v), until each virtual halftone dot center in the base supercell is included in the ordering sequence.

Method and apparatus for making dot patterned plate

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Spot function endtone noise and growth

A method of preventing Moire patterns in a halftone image includes creating a digital screen including a collection of cells having pixels with threshold values according to a spot function, and dithering the threshold values corresponding with the endtones while not dithering the midtone gray values. Preferably, the amount of dither increases with the difference between the threshold value of the pixels from the midtones. The growth of the spot due to increasing gray values is controlled such that all cells grow at the same rate at the endtone gray values, and some cells grow at different rates at the midtone gray values.

Image forming apparatus, image forming method, and method of producing printed material for generating a parallel line pattern of uniform concentration

An image forming apparatus includes: a pseudo-halftone processing unit that processes input image data to output image data of first resolution; a resolution converting unit that converts the image data of the first resolution into image data of second resolution that is higher than the first resolution; a modulation-signal generating unit that generates a modulation signal obtained by modulating the image data of the second resolution according to a clock signal; and a light-source driving unit that drives a light source according to the modulation signal. The pseudo-halftone processing unit converts a region of pixels having the same pixel value into a parallel line pattern that is formed with a plurality of parallel lines oblique relative to a direction of arrangement of pixels. The resolution converting unit generates the image data o in which each edge of the lines forming the parallel line pattern is smoothed.

Image processing unit, image processing system, and method for generating image processing screen

(57)【要約】 【課題】 プリンタ等の画像出力装置に対して、スーパ ータイル方式でスクリーンを生成する画像処理装置にお いて、高い線数を保持しつつ低周波の周期構造の発生を 防止する。 【解決手段】 各スーパータイルには閾値マトリクスパ ターンが適用され、入力画像データとこの閾値との比較 結果に応じて、ドットパターン（二値画像データ）が生 成される。また、各スーパータイルは、複数（３×３） のハーフトーンセルに分割され、このハーフトーンセル 毎にドットパターンが形成される。本発明においては、 同一形状を有する複数の閾値マトリクスパターンＰ１〜 Ｐ１０を用意し、適用されるパターンをランダムに選択 する。これらのパターンは、例えば、図８（ａ）に示す ように割り当てられる。これにより、各ハーフトーンセ ル毎にドットの重心がばらつくから、同図（ｂ）に示す ように、周期構造は現れない。

Halftone image reproducing method and system by automatic gamma correction

(57)【要約】 隣接画素の領域に対応する大きなまたはマクロのハーフトーンセルを画定しかつこのマクロハーフトーンセルをより小さなハーフトーンセルに区分することにより、出力画素の領域全般におけるハーフトーン処理のための方法および装置を提供する。マクロハーフトーンセル内のグレイまたは色相レベルは、このマクロのハーフトーンセル内で暗くされる画素の数により決定される。入力データに応じて暗くすべき画素の数の選択については、自動ガンマ補正を行う方法で実施することができる。一実施形態においては、各々のマクロハーフトーンセル内の画素は、非線形関数にしたがって等級づけされる。

Multi-stage screening with mesh screen of arbitrary dot width and dot angle

(57)【要約】 ここに記載されているのは、任意の所望の網点幅（rwsoll）および任意の所望の網点角度（αsoll）とを有する網目スクリーン（６）によってハーフトーン画像をディジタル式に多段階でスクリーニングする方法であり、ここでは閾値を読み出し、またこの読み出された閾値と、上記のハーフトーン画像の色階調値とを比較することによってスクリーニングが行われる。このために閾値行列が使用され、ここでこの閾値行列において閾値は、上記の所望の網点幅および所望の網点角度を近似する所定の網目スクリーン（３）の１つまたは複数の網点を表す。閾値を読み出す間に上記の所望のスクリーン（６）の座標と、所定の網目スクリーン（３）の座標との間の誤差が求められ、この誤差があらかじめ設定した境界値を上回るとただちに、この誤差が閾値行列に対する読み出しアドレスの補正によって補償される。閾値行列の代わりに印刷値行列を使用することも可能であり、この印刷値行列には、印刷すべき印刷値の、色階調値に当てはまる分配が記憶される。

Increased functionality for holladay halftoning

This is a halftone circuit which, in addition to the usual counting and addressing mechanisms, has control over the phase, angle and direction of the addressing circuitry of the array in memory so that regular dots, mirror images of dots and out-of-phase dots can be created from a single array, thus saving memory hardware. The mirror images can be made by counting rows in either direction, the angle can be varied by varying the number of pixels shifted between scans, and the phase can be varied by setting the starting point to any row and column. In this way, a single array can be used to create a number of dots.

Methods and apparatus for dynamically soft proofing halftone images

Methods and apparatus are provided for dynamically halftoning image data, substantially in real-time. Halftone threshold values are calculated and stored in memory, and halftone output values are calculated for the portions of the image data that will be displayed on a display device. Halftone screen parameters may be modified, and new halftone screen threshold values may be calculated for any affected halftone screens. For unaffected halftone screens, the previously stored threshold values may be retrieved from memory. In addition, the portion of the image to be displayed may be modified, and the halftone output values of the new portion may be calculated and then displayed.

Display device of intermediate tone picture

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Image processing apparatus and method intensively providing dots in halftone process

There is provided an image processing apparatus, operating as described below, employing an error distribution method to perform a halftone process intensively providing dots to achieve high resolution and a high level of tone representation simultaneously. The image processing apparatus, employing the error distribution method to convert an image represented by multiple values into an image provided in binary representation, employs a distribution weighting coefficient to distribute an error caused at a target pixel to a neighboring pixel. The distribution weighting coefficient simply decreases and ultimately attains zero as the distance from the target pixel increases, and the distance extending to attain zero is also set to vary with direction. Such a distribution weighting coefficient allows a halftone process providing dots intensively.

Halftone image generation apparatus and method for reducing defects in printed images

Apparatus and method for collectively performing tile-based image rotation, scaling and digital halftone screening

A tile-oriented technique and associated apparatus for manipulating a continuous tone (contone) image through image rotation, anamorphic scaling and digital halftone screening for use in illustratively implementing a page description language. Specifically, an incoming contone image is first partitioned into aligned non-abutting tiles (e.g. 215 1 , 215 2 ,..., 215 9 ). Overlapping blocks (e.g. 217,, 217 2 , ..., 217 9 ) are then defined which will hold output data for corresponding tiles. To effect rotation and anamorphic scaling of the contone image, two-dimensional sampling increments, in fast and slow scan directions, are defined to relate movement between successive pixels in an output block to movement between corresponding pixels in the contone image. Similar, though independent, sampling increments, also in the fast and slow scan directions and based in part upon screen angle and screen ruling, are defined for movement between successive pixels in a halftone reference cell. To generate output data for each successive pixel location in a block, incremental sampling occurs in the contone image to yield a corresponding sampled contone value. This value, in conjunction with incremental halftone sampling addresses, then defines a sampling location that is read in a halftone reference plane (e.g. 242 181 ), the resulting output of which is single bit halftone data that defines a writing spot. Each tile in the contone image is successively processed, using two nested loops (1950, 1960), with resulting output data for that tile being written into appropriate pixel locations in a corresponding block in the output image. Clipping variables, incrementally varying in two-dimensional fashion and in unison with the contone pixel sampling location, define valid output data for a contone tile that is to be written into a corresponding block.

Engraving system and method with arbitrary toolpath control

The invention is characterized in that it comprises a toolpath generating routine and system for generating a plurality of control points directly from image data representing an image to be engraved. The control points are used to generate a toolpath which, in turn, will be used to energize an engraving head such that a tool or stylus will engrave a pattern of engraved areas in response to the toolpath. An engraving system and method for engraving at least one engraved area is shown having an engraving head tuner for tuning an engraving head such that the frequency characteristic of the engraving head defines a substantially constant gain for frequencies less than a predetermined frequency. The invention is further characterized in that it incudes a system and method for interactively or automatically tuning the engraving head, interactively adjusting the filter characteristics (including the filter coefficients for the filters used on the engraving head) and for being responsive to the type of image data (whether continuous tone data or linework data). The invention is characterized in that it synthesizes the screening function so as to more accurately reproduce the image to be engraved by engraving multiple frequency cells where single cells would be engraved in the past.

Methods of controlling dot size in digital halftoning with multi-cell threshold arrays

Metallic image forming method

A metallic image forming method is a method for forming a metallic image with a metallic ink containing an organic coloring agent capable of exhibiting a metallic color on a recording medium provided with an undercoat layer thereon having a black color or an opposite color to the color of diffused light from the metallic ink. The method includes applying the metallic ink onto the recording medium so as to cover at least part of the undercoat layer.

Deep engraver (versions), cell width measuring method, cell engraving method (versions), method and apparatus for engraving series of cells

Сущность группы изобретений заключается в том, что определяется величина ошибки, соответствующая разности между набором заданных установочных параметров и фактическим измерением части выгравированного участка гравировального цилиндра. Затем эта величина ошибки используется для регулировки гравировального инструмента для фактического реза линии или выемки в соответствии с набором заданных установочных параметров. Преимущество изобретения состоит в том, что имеется система обнаружения и исправления ошибок, которая может быть использована в замкнутых системах с обратной связью для гравирования цилиндра. Технический результат данной группы изобретений состоит в том, чтобы разработать гравировальную систему, которая могла бы быть быстро и легко отрегулирована для гравирования ячеек контролируемого размера на поверхности цилиндра для печати гравюр. 10 с. и 14 з.п.ф-лы, 10 ил. ОЗС с ПЧ Го (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ” 2 132 280 ' (51) МПК 13) С1 В 41С 1/02, 1/04, 1/06, Н 04 М 1/42, С 01В 11/28 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 96108261/12, 15.07.1994 (30) Приоритет: 23.09.1993 1$ 125,938 (46) Дата публикации: 27.06.1999 (56) Ссылки: МО 8100320 А\Л, 07.02.81. Ц$ 5029011 А, 02.07.91. 4$ 4944593 А, 31.07.90. ЕР 0402754 А2, 19.12.90. \!О 91/16784 АЗ, 31.10.91. \МО 9304816 АЛ, 18.03.93. $0 1419920 АЛ, 30.08.88. 5Ц 192664 А, 08.04.67. (85) Дата перевода заявки РСТ на национальную фазу: 23.04.96 (86) Заявка РСТ: 1$ 94107929 (15.07.94) (87) Публикация РСТ: М/О 95/08443 (30.03.95) (98) Адрес для переписки: 103104, Москва, Б.Палашевский пер., 3, офис 2, ЗАО Юридическая фирма Гоулинг, ЗАО Юридическая фирма Страти и Хендерсон, патентному поверенному Клюкину В.А. (71) Заявитель: Огайо Электроник Ингрэйвес, Инк. ($) (72) Изобретатель: Головко Паул Л. (ЦЗ), Сейтц Дэвид Р. (4$), Вудс Куртис (ЦЗ) (73) Патентообладатель: Огайо Электроник Ингрэйвес, Инк. (ЦЗ) (54) ГРАВИРОВАЛЬНАЯ МАШИНА ГЛУБОКОЙ ПЕЧАТИ (ВАРИАНТЫ), СПОСОБ ...

Apparatus for addressing a font to suppress Moire patterns occurring thereby and a method for use therein

Apparatus and an accompanying method for use therein are disclosed for suppressing a screener induced Moire pattern that would otherwise appear in a reproduced color image generated by a raster based marking engine (20). This Moire pattern results from successively sampling a stored bit-mapped font pattern in a grid like raster based writing pattern in order to produce a visual depiction of the stored font pattern in the image. Specifically, this Moire is suppressed by forming an address, for use in successively accessing each desired bit in the stored font pattern, in which the address is formed of at least two portions in which each portion is generated through a summation of an orthogonal positional value with a corresponding specific amount of noise. The amount is a substantially random value occurring within a noise function (1720) that is defined by a substantially uniform probability distribution occurring throughout a region, in the position domain, that has a width equal to the spacing between adjacent micro pixels that form the visual depiction and is substantially zero valued elsewhere. Use of such an amount of noise is sufficient to substantially suppress the amplitude of this screener induced Moire pattern that would otherwise occur in the reproduced image but is advantageously insufficient to inject any distinct artifacts into the image or affect image Moires.

Method, apparatus and printed matter for generating an image having a difference in gloss

Patent DE3312273C2

Digital electronic system for halftone printing

TITLE DIGITAL ELECTRONIC SYSTEM FOR HALFTONE PRINTING ABSTRACT OF THE DISCLOSURE A system for producing an image by halftone printing comprises generating halftone dots from electronic data by scanning across across a raster of write spots in a recording medium, spot-by-spot and line-by-line. Each dot is defined within a repetitive dot template containing a plurality of write spots. The system writes at selective write spots by sending a present write-spot address signal obtained from a write-spot address register to a spot-status Look-Up-Table for selecting a predetermined value for each write spot, the predetermined value determining an on-off status for the present write spot. The spot-status Look-Up-Table has a plurality of predetermined values corresponding, respectively, to addresses of write spots within the dot template. In the present invention, the selective writing step is performed by sending the write-spot address signal also to a pointer Look-Up Table for generating an address pointer signal uniquely associated with a particular write-spot address code, and transmitting the address pointer signal to the write-spot address register in order to obtain the next write-spot address signal.

Multi-tone level screening with screens of any screen width and screen angle

Engraver for defining/generating edges or edge signals

This invention provides an engraving method and apparatus for engraving a plurality of cells which define a pattern defining at least one edge on a surface of a cylinder. The method and apparatus generate an edge signal corresponding to at least edge cell situated in a pattern defining at least one edge on the surface. The system and method may utilize a tabulator for tabulating a table of data corresponding to an image and a locator for locating the edge using the data. The system and method provide a signal generator which can cause the engraving location of an engraved area to be shifted to facilitate defining the at least one edge. Moreover, the signal generator may also cause the area to be reduced in order to change a predetermined characteristic of the area in order to better define the at least one edge. Thus, the invention facilitates adjusting a characteristic of at least one of the engraved areas in order to change a spacial relationship between the engraved area and another engraved are to provide, for example, a non-regular or non-periodic spacing of engraved areas. The invention provides a shaping data generator for generating shaping data to be used to modify the image data corresponding to an area to be engraved to redefine at least a portion of the data to provide an engraved area having a desired shape.

Method and apparatus for recording halftone dot image with different repeating units

A method of, and an apparatus for, recording halftone dots on a photosensitive film by selecting halftone dots having different minimum repeating units in response to respective original image components. SPMs (103a to 103d) previously store screen pattern (SP) signals having different minimum repeating units, while address generation controllers (AGCp to AGCs) previously store address signals corresponding to the respective SP signals. Pattern selection signals (PPS) are inputted in response to respective original image components and the address signals are selected in correspondence thereto and inputted in the SPMs (103a to 103d), thereby reading the SP signals. Comparators (104a to 104d) compare pixel signals (DSa to DSd) expressing density levels of respective pixels forming a total image with the selected SP signals, to output halftone dot signals (DOTa to DOTd) in response to the result of this comparison. Thus, it is possible to select halftone dots having different minimum repeating units in response to respective original image components, to record the same on a photosensitive film.

Printing apparatus for color electronic photograph

To provide a color printing apparatus which is freed of a problem such that, if gradation conversion processing of picture data is to be implemented by hardware, the number of the registers is prohibitively increased to increase the cost if the gradation curve information required for gradation conversion processing is to be stored in its entirety in the registers. The printing apparatus includes a basic gradation curve register for storage of the basic gradation curve information and a shifting quantity register for storing the shifting quantity information. The values of the information data are calculated by the gradation curve calculation circuit to generate the gradation curve information which is stored in gradation curve information registers. The color picture data entered to the apparatus are gradation-converted, based on the gradation curve information, and are transferred to an engine part in the apparatus to output a picture.

Relief plates, platemaking masters therefor, and methods for producing such platemaking masters and plates

A relief plate, e.g., flexographic plate for printing an image, a platemaking master for producing a relief plate, and a method for producing a platemaking master. The image includes an area to be printed solid. The plate includes in the area to be printed solid a set of line pattern perforations designed to not carry ink on the plate. The line pattern perforations include at least one of the set of patterns consisting of a line screen pattern, a jagged line pattern, a wavy line pattern, a line pattern wherein the lines are not of constant thickness, a cross-hatch pattern, and a periodic pattern of circular lines. In one version, the relief plate including at least one area intended for reproducing a minimum non-zero gray-level using a first halftone pattern of dots. The platemaking master for the relief plate provides exposure in the well-regions between the halftone, such that the wells in the plate are shallower than if no exposure is provided, thereby providing for smaller halftone dots than if no exposure is provided in the well regions of said at least one area.

Multilevel clustered dot screening method with improved detail and reduced image noise

A method and a printing system are described capable of rendering more than 2 density levels at the device pixel level using precalculated rectangular screening tiles of finite size that define a spatially repetitive screening operation according to geometric clustered dot screen definitions for first, second and third separation screens that has the following characteristics: (A) the set of at least three separation screens is free of second order moiré; (B) the set of at least three separation screens consists of screens that have no internal moiré and/or screens that have a reduced sensitivity to amplification by process instability of any remaining level of intrinsic internal moiré; and (C) the screens have an optimized and balanced rosette structure leading to a reduction of visible patterning in overlays of the separation screens.

System and method for enhancing edges and the like for engraving

A method and apparatus for engraving wherein the engraver includes a merge system for merging image data to be engraved in a manner which will reduce or eliminate "halo" and/or "ghost" images. The method utilizes a processor in an engraver for creating image data comprising continuous tone data and line work data. The method further involves the steps of locating transition data corresponding to where the continuous tone data and line work data meet; and processing at least some of the image data to provide processed image data using the transition data located in the locating step. The engraver has an engraving bed; a headstock and a tailstock located on the engraving bed for rotatably supporting a cylinder to be engraved; an engraving head located on the engraving bed for engraving the cylinder; an image data generator coupled to the engraving head, the image data generator being capable of creating image data comprising continuous tone data, line work data and transition data. The image data generator comprises a locator for locating the transition data and a processor associated with the locator for processing at least some of the image data to provide processed image data using the transition data located by the locator. The system and method facilitate selectively enhancing at least one edge or area within a data set, such as either a line work data set or a continuous tone data set, while selectively avoiding enhancing other areas, such as an area between a line work area and continuous tone area of an image.

Halftone image processing system for setting density threshold values

An image processing system for converting an input pixel into n subpixels P1, P2, . . . , Pn, said system includes a comparator for comparing density threshold values D1, D2, . . . , Dn (where D1<D2<. . . <Dn) corresponding to the subpixels P1, P2, . . . , Pn with a density of the input pixel, Din; and a density setting unit for setting subpixels P1, P2, . . . , Pk corresponding to density threshold values D1, D2, . . . , Dk of the density threshold values D1, D2, . . . , Dn (where k<n) less than the density Din to a high density, setting subpixels Pk+2, . . . , Pn to a low density, and setting subpixel Pk+1 to an intermediate density.

Graphics co-processor

ABSTRACT The present invention provides an apparatus and method for rendering graphic images as bit maps. The system includes an input for receiving digital input commands, a command interpreter to interpret the input commands and convert them into commands suitable for use inside the system, and several inputand output buffers. A halftone screening section and a rendering section output data suitable for use by a raster display or marking engine. The system can render multiple output pixels during each machine iteration, typically four pixels per clock cycle. The system can also apply halftone screens or gray fills to an image, rendering multiple pixels per clock cycle. A preferred embodiment is a single-chip graphics co-processor (GCP).

Dot-matrix imaging method

Method of recording halftone dot image

Screen patterns for respective color components are represented by arrays of unit regions. The arrays for respective color components have a same array pitch and a same array orientation. Color component images are converted into color component halftone dot images through the screen patterns. When the density of the color component images is in a predetermined range, the color component halftone dot images have a plurality of linear dot elements in each unit region. The plurality of linear dot elements extend in a predetermined direction which is different for each color component.

Dither image processing method

A dither processing method comprising steps of: a) Defining a non-rectangle dither cell and a macro dither cell consisting of a plurality of the dither cells arranged in a predetermined form; b) Defining an order of magnitudes of threshold of pixels in the dither cell; c) Defining an order of magnitude of threshold of the dither cells in the macro dither cell; d) Defining a threshold for each the pixel of each the dither cell in the macro dither cell according to the order of magnitude of threshold of the pixels in the dither cell as well as the dither cells in the macro dither cell.

Method for adjusting dot size in digital halftoning with multi-cell threshold array

Apparatus for addressing a font to suppress moire patterns occurring thereby and a method for use therein

L'invention concerne un appareil supprimant une configuration moirée induite par une unité de sérigraphie et résultant de l'échantillonnage successif d'une configuration de caractère stockée à topographie binaire, dans une configuration d'écriture basée sur un réseau. On supprime ledit moiré en formant une adresse, utilisée pour accéder successivement à chaque bit désiré dans la configuration de caractère stockée. L'adresse se compose d'au moins deux parties, chacune créée par sommation d'une valeur de position orthogonale avec une quantité de bruit spécifique correspondante. La quantité est contenue dans une fonction de bruit (1720) définie par une répartition de probabilité sensiblement uniforme dans une région présentant une largeur égale à l'espace situé entre des pixels de reproduction, et représente une valeur sensiblement nulle ailleurs. An apparatus for removing a moiré pattern induced by a screen printing unit and resulting from successively sampling a binary topography stored character pattern, in a network-based write pattern. Said moiré is removed by forming an address, used to successively access each desired bit in the stored character configuration. The address consists of at least two parts, each created by summing an orthogonal position value with a corresponding specific amount of noise. The quantity is contained in a noise function (1720) defined by a substantially uniform probability distribution in a region having a width equal to the space between reproduction pixels, and represents a value substantially zero elsewhere.

Device and method for generating dot type dither pattern

(57)【要約】 【課題】 タイリングの際に網点画像にずれを生じさせ ない正方形なので複数のディザパタ−ンの組み合わせ配 置を容易にする網点型ディザパタ−ンの生成装置並びに その方法を提供する。 【解決手段】 閾値を予め決められた順にマトリクス状 に配置した単位パタ−ン２を生成する単位パタ−ン生成 手段と、網点画像がディザパタ−ン１のパタ−ンサイズ の一辺１ａに対してスクリ−ン角θ°有するように単位 パタ−ン２の閾値を配置し、ディザパタ−ン２のタイリ ングの際に網点画像にずれを生じさせない正方形のパタ −ンサイズに生成するディザパタ−ン生成手段とを備え る。

Method and device for forming image on electronic photography member

Shivering image processing method.

Image data generation device, image data generation processing program and thermal transfer recording device

An image data generation device is provided with: an image data acquisition unit for acquiring image data; a division unit for spatially dividing the acquired data by a plurality of matrices; a priority order setting element for setting the priority order for performing gradation conversion of picture elements that make up the image data that corresponds to each of the matrices, and sets the priority order so that the priority order becomes lower going from picture elements located in the center of the matrix toward picture elements located on the outside edges of the matrix; a gradation conversion member for performing gradation conversion of the picture elements according to the priority order; and an image data generation unit for generating image data for printing based on a dot pattern that is formed by the picture elements after the gradation conversion.

Image processing method and device

Method of recording a halftone picture electronically

A method for recording a halftone picture electronically, for use in a halftone picture reproducing machine for plate making is disclosed. A plurality of halftone data corresponding to a plurality of picture elements of a vignette halftone dot is simultaneously read out of a memory in which the vignette halftone dot quantized is stored, in synchronization with picture signals, and the halftone data and the picture signals are added to obtain recording signals, and according to the recording signals a plurality of light beams for exposure are controlled to be open or close, thereby recording a halftone picture. The number of the light beams included in a recording scanning width is selected depending on a screen pitch, and then the selected light beams are controlled according to the recording signals.

Method for forming halftone screen

This invention is a method for fomring halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated electrically, which comprises the steps of exposing and scanning a light spot of a predetermined sizze at a predetermined pitch to form halftone dots, and changing the number of said pitch so as to obtain an arbitrary screen line number. Further, this invention relates to a light beam scanning apparatus for forming halftone screen to prepare a multi-color separated halftone gradation image which is printable and reproducible by superposing an image signal obtained by scanning an original comprising continuous-tone color images with a halftone screen signal generated elec­trically, which comprises a first laser diode for emitting a synchronizing laser beam, a second laser diode for emitting a recording laser beam, a galvanometer for inputting the synchronizing laser beam and the recording laser beam through a collimator and a mirror, a synchronizing signal generator and an image recording section for inputting laser beams reflected and deflected by said galvanometer, a PLL multiplier for outputting a synchronizing signal by inputting an electric signal from said synchronizing signal generator, and an output controlling section for driving the second laser diode in accordance with the image signal and the synchronizing signal.

Halftone image generating apparatus

A halftone image generating apparatus for use in a halftone image generating system for generating threshold value data corresponding to positions in a main scanning direction and a subsidiary scanning direction, comprising a threshold value data generating circuit for generating the threshold value data in a matrix pattern having a variable number of lines and rows, and for converting input picture image data having chromatic gradations into binary value data by comparing the input picture image data to the threshold value data, and a circuit for forming a scanning mesh dot image corresponding to the input picture image data.

ELECTRONIC SIMILIGRAVURE SCREENING PROCESS AND APPARATUS

Un signal électronique représentant la densité d'éléments d'image d'une ligne analysée dans une image originale et contenant un nombre d'éléments d'image égal à la somme d'un multiple entier du nombre de valeurs de point partiel d'une unique ligne de trame de demi-teinte et d'un paramètre d'extension prédéterminé est transformé électroniquement en signal de reproduction en similigravure par comparaison du signal d'image avec l'unique ligne de valeurs de point partiel de la trame de similigravure pour former une image en demi-teintes électronique. Une fonction de trame électronique représentée par l'unique ligne de valeurs de point partiel produit automatiquement une trame de similigravure déplacée angulairement jusqu'à un angle prédéterminé par rapport à l'image électronique originale lorsque le nombre d'éléments d'image de la ligne analysée du document original est rendu égal à la somme d un multiple entier du nombre de valeurs de point partiel et d'un paramètre d'extension prédéterminé. Alors l'entrée analysée est automatiquement tramée électroniquement en cellules de demi-teinte présentant approximativement la forme d'un parallélogramme s'étendant suivant ledit angle prédéterminé. L'unique ligne de valeurs de point partiel a seulement besoin d'être décalée circulairement à travers un comparateur. Aucun indexage ou décalage électronique de valeurs de point partiel n'est nécessaire. An electronic signal representing the density of picture elements of a line analyzed in an original image and containing a number of picture elements equal to the sum of an integer multiple of the number of partial point values of a single line of halftone raster and a predetermined extension parameter is electronically transformed into a halftone reproduction signal by comparing the image signal with the single line of partial point values of the halftone raster to form an electronic ...

Method of generating a set of threshold matrices for producing color separations

System and method for producing color shifting or gloss effect and recording medium with color shifting or gloss effect

An ultraviolet image pattern is created on a recording medium having florescence properties and a first color by electronically creating a first electronic pattern ink, the first electronic pattern ink including a second color, holes, and a first pattern, the holes representing areas in the first electronic pattern ink wherein the second color is absent; electronically creating a second electronic pattern ink, the second electronic pattern ink including the second color, holes, and the first pattern, the holes of the second electronic pattern ink representing areas in the second electronic pattern ink filled with a third color, the third color being equal to the first color; electronically creating an electronic image region having a background and a foreground; electronically painting, using the first electronic pattern ink, the background of the electronic image region; electronically painting, using the second electronic pattern ink, the foreground of the electronic image region; and rendering, using marking materials, the electronic image region on a recording medium such that only the florescence properties of the recording medium are only visible through the holes when viewing the recording medium using ultraviolet illumination.