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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 63. Отображено 63.
03-04-2013 дата публикации

Multi-view video bit rate control method based on sensing

Номер: CN103024387A
Принадлежит:

The invention discloses a multi-view video bit rate control method based on sensing. The method is characterized in that bit rates of a view layer, an image group layer, a frame layer and a macro-block layer are respectively controlled, bit allocation of views is determined by pre-encoding an image group in the view layer, target bits and initial quantization parameters of the image group are calculated according to structural characteristics of layered frames B in the image group layer, target bits of each frame are determined according to predicted complexity in the frame layer, and bit allocation of macro-blocks is determined according to a visual perception characteristic modification rate distortion model in the macro-block layer. The method has the advantages that the stability of video quality and the quality of a visual sensitive area are effectively improved by the bit rate control method, the peak signal-to-noise ratio of the most visually sensitive area is increased by 0.18-0.54dB ...

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02-10-2013 дата публикации

Multi-view depth video fast coding method

Номер: CN103338370A
Принадлежит:

The invention discloses a multi-view depth video fast coding method. A coding mode complexity factor of a macro block is provided; the macro block is attributed to a simple mode zone or a complex mode zone according to the coding mode complexity factor, namely, a depth video is divided into the simple mode zone and the complex mode zone, and different fast coding mode selection strategies are adopted according to different zones; search for simple coding modes is performed for a macro block in the simple mode zone, and search for complex coding modes is performed for a macro block in the complex mode zone; and therefore, little-contributed time-consuming coding mode search in the coding process of a current coding frame can be avoided. As a result, under the premise that virtual viewpoint rendering quality is ensured and the bit rate of depth video coding is not affected, the computation complexity of multi-view depth video coding can be effectively reduced, and the coding time of the multi-view ...

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02-10-2013 дата публикации

Stereoscopic video objective quality evaluation method based on machine learning

Номер: CN103338379A
Принадлежит:

The invention discloses a stereoscopic video objective quality evaluation method based on machine learning. When spatial domain quality of luminance component images of single-frame images is evaluated, each image block of luminance component images of each frame of image in original and distorted stereoscopic videos is subjected to singular value decomposition, and dot product of singular vectors obtained from singular value decomposition is adopted to evaluate distortion degree of each frame of image in the distorted stereoscopic video. Because the singular vectors can greatly reflect structural information of images, when the dot product of the singular vectors is adopted to evaluate the quality of the images, changes of the structural information are considered, and therefore, evaluation results can reflect changes of visual quality of the stereoscopic video more objectively when the stereoscopic video is under various kinds of distortion influences. According to the stereoscopic video ...

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18-07-2012 дата публикации

Stereo image quality objective evaluation method

Номер: CN102595185A
Принадлежит:

The invention discloses a stereo image quality objective evaluation method. According to the method, a cyclopean image of a stereo image formed in a human vision system is obtained by simulating a stereo image treating process of the human vision system. The cyclopean image is composed of an occlusion region, a binocular fusion region and a binocular occlusion region. The stability is strong by representing an image attribute via an image singular value, and the distortion degree of the cyclopean image corresponding to a tested stereo image is represented via a singular value distance between the cyclopean image corresponding to the tested stereo image and the cyclopean image corresponding to a reference stereo image by combining different regional characteristics in the cyclopean image treated by the human vision system, so that the overall vision quality of the tested stereo image is finally obtained. Through the method disclosed by the invention, the change of the vision quality on the ...

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24-07-2013 дата публикации

Method for hiding loss errors of three-dimensional video macro blocks

Номер: CN103220533A
Принадлежит:

The invention discloses a method for hiding the loss errors of three-dimensional video macro blocks. According to the method, the motion and static states of the macro blocks in a lost frame are estimated by prejudging the magnitude of time domain relevance between adjacent time domain frames of the lost frame and adjacent frames among viewpoints, the macro blocks are classified into motion macro blocks and static macro blocks, and lost macro blocks are restored by adopting a direct time domain frame copying method specific to static macro blocks with high time domain relevance, so that the calculation complexity is low, and the subjective and objective quality of the type of lost macro blocks can be improved; and specific to the motion macro blocks, an optimal candidate macro block is selected from candidate macro blocks pointed by each vector in a candidate vector set of the lost macro blocks by adopting two boundary matching principles, optimally matched macro block recovery or multi-direction ...

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18-07-2012 дата публикации

Method for error concealment of whole frame loss of stereoscopic video

Номер: CN102595145A
Принадлежит:

The invention discloses a method for error concealment of whole frame loss of stereoscopic video, which considers coding characteristics of the stereoscopic video sequence as well as similarities of the video sequence time domain and the inter-view video image information zone characteristics, estimates static zones and motion zones of a lost frame through image frames which are correctly decoded at a left view point and a right view point by using similarities between static zones and motion zones of images at the left view point and the right view point and static zones and motion zones of images of adjacent time at the same view point if the frame at the right view point for a time is lost, then uses inter-view global disparities to divide motion zones of the lost frame into a shielding boundary zone and a non-shielding boundary zone, restore lost information by respectively using motion compensation prediction and disparity compensation prediction for the shielding boundary zone and ...

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09-10-2013 дата публикации

Method for evaluating stereo image vision comfort level based on machine learning

Номер: CN103347196A
Принадлежит:

The invention discloses a method for evaluating a stereo image vision comfort level based on machine learning. According to the method, the important vision area mask of stereo images is extracted through the saliency map of a right viewpoint image and a right parallax image, a characteristic vector used for reflecting parallax range characteristics and parallax gradient characteristics and a characteristic vector used for reflecting space frequency characteristics are extracted through the important vision area mask, the characteristic vectors of the stereo images are obtained, training is carried out on all the stereo images in a stereo image set through support vector regression, and finally each stereo image in the stereo image set is tested through a support vector regression training model obtained in training to obtain the vision comfort level evaluation predicted value of each stereo image. The method has the advantages that the obtained characteristic vector information of the ...

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25-12-2013 дата публикации

Adaptive image quality evaluation method based on distortion type judgment

Номер: CN103475897A
Принадлежит:

The invention discloses an adaptive image quality evaluation method based on distortion type judgment. The method comprises the steps that firstly, distortion types of images are judged and are divided into a type of white Gaussian noise distortion, a type of JPEG distortion and a type of blur class distortion, wherein the blur class distortion comprises Gaussian blur distortion, JPEG2000 distortion and fast fading distortion; through the utilization of distortion judgment results, evaluation is carried out on images with the white Gaussian noise distortion by using a structural similarity model based on pixel domains, evaluation is carried out on images with the JPEG distortion by using a structural similarity model based on DCT domains, and evaluation is carried out on images with the blur class distortion by using a structural similarity model based on wavelet domains. The adaptive image quality evaluation method based on the distortion type judgment is indicated to be an objective evaluation ...

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15-05-2013 дата публикации

Stereo image objective quality evaluation method based on integration of visual threshold value and passage

Номер: CN103108209A
Принадлежит:

The invention discloses a stereo image objective quality evaluation method based on integration of a visual threshold value and a passage. The stereo image objective quality evaluation method based on the integration of the visual threshold value and the passage includes: conducting visual threshold value analysis and singular value decomposition by distributing passages on an a left viewpoint image of an undistorted stereo image and a right viewpoint of the undistorted stereo image and a left viewpoint image of a distorted stereo image and a right viewpoint of the distorted stereo image; conducting visual threshold value analysis and singular value decomposition by distributing passages on difference images of the left viewpoint image of the undistorted stereo image and the right viewpoint of the undistorted stereo image and the left viewpoint image of the distorted stereo image and the right viewpoint of the distorted stereo image, and obtaining a stereo perception evaluating measurement ...

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04-10-2016 дата публикации

Objective assessment method for stereoscopic video quality based on wavelet transform

Номер: US0009460501B1
Принадлежит: Ningbo University, UNIV NINGBO

An objective assessment method for a stereoscopic video quality based on a wavelet transform fuses brightness values of pixels in a left viewpoint image and a right viewpoint image of a stereoscopic image in a manner of binocular brightness information fusion, and obtains a binocular fusion brightness image of the stereoscopic image. The manner of binocular brightness information fusion overcomes a difficulty in assessing a stereoscopic perception quality of a stereoscopic video quality assessment to some extent and effectively increases an accuracy of a stereoscopic video objective quality assessment. When weighing qualities of each frame group in a binocular fusion brightness image video corresponding to a distorted stereoscopic video, the objective assessment method fully considers a sensitivity degree of a human eye visual characteristic to various types of information in the video, and determines a weight of each frame group based on a motion intensity and a brightness difference.

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03-04-2013 дата публикации

Three-dimensional image semi-fragile watermarking method based on binocular just-perceived distortion

Номер: CN103024375A
Принадлежит:

The invention discloses a three-dimensional image semi-fragile watermarking method based on binocular just-perceived distortion, comprising the following steps of: firstly, extracting positioning watermarks of left and right images; then, determining embedded bit positions of the positioning watermarks on the left image according to a binocular just-perceived distortion value of the left image, so as to embed the positioning watermarks of the left and right images into the left image by layers; and finally, utilizing discrete cosine transform and JPEG (Joint Photographic Experts Group) quantitative compression to embed right image recovering information into the right image; and with regard to the left image, embedding recovering information after an exposure shielding region is compressed into the left image. The three-dimensional image semi-fragile watermarking method has the advantages that the method sufficiently utilizes the matching property of the left and right images so that the ...

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02-10-2013 дата публикации

Adaptive image quality objective evaluation method

Номер: CN103338380A
Принадлежит:

The invention discloses an adaptive image quality objective evaluation method. When the adaptive image quality objective evaluation method is adopted to obtain the structural similarity between two image blocks which have the same coordinate position in an original undistorted image and a distorted image to be evaluated, not only are the brightness mean value and standard deviation of all pixels in each image block in the original undistorted image and the distorted image to be evaluated, as well as the covariance among all the pixels in two image blocks in the original undistorted image and the distorted image to be evaluated utilized, but also the distortion types of the distorted image to be evaluated are utilized in a combined manner. Thus, the adaptive image quality objective evaluation method can determine the structural similarity between two image blocks according to the distortion types of the distorted image to be evaluated in the perspective of adaptive evaluation, and therefore ...

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04-09-2013 дата публикации

Objective evaluation method for stereo image quality on the basis of image decomposition

Номер: CN103281556A
Принадлежит:

The invention discloses an objective evaluation method for the stereo image quality on the basis of image decomposition. The objective evaluation method for the stereo image quality on the basis of the image decomposition comprises the following steps: firstly, respectively decomposing the left viewpoint image of a distorted stereo image to be evaluated into a recovery image and an interference image; decomposing the right viewpoint image of the distorted stereo image to be evaluated into a recovery image and an interference image; respectively evaluating the recovery images of the left viewpoint image and the right viewpoint image by adopting the local phase characteristic and the local vibration amplitude characteristic; respectively evaluating the interference images of the left viewpoint image and the right viewpoint image by using a singular value vector; and obtaining the objective evaluation predicted value for the distorted stereo image quality to be evaluated. The objective evaluation ...

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27-11-2013 дата публикации

Three-dimensional image objective evaluation method based on visual characteristics

Номер: CN103413298A
Принадлежит:

The invention discloses a three-dimensional image objective evaluation method based on visual characteristics. Frequency responses, corresponding to different center frequencies and directivity factors, of all pixels of left and right viewpoint images of a three-dimensional image are calculated, the three-dimensional image is divided into a shielding region and a binocular fusing region according to a region detection method, the two regions are evaluated respectively through monocular vision characteristics and binocular vision characteristics, and evaluation results are integrated to obtain the predicted final objective image quality evaluation value. The three-dimensional image objective evaluation method has the advantages that the obtained frequency responses corresponding to the different frequencies and directivity factors can well reflect the visual perception characteristics of human visual systems; because monocular vision characteristics and binocular vision characteristics are ...

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03-04-2013 дата публикации

Macro block mode fast selecting method based on just noticeable distortion

Номер: CN103024381A
Принадлежит:

The invention discloses a macro block mode fast selecting method based on just noticeable distortion. A just noticeable distortion image of a time-space domain corresponding to each color image in color television video sequences to be processed is obtained, a just noticeable distortion value of each image block in the just noticeable distortion image of the time-space domain is calculated, and then an optimal macro block encoding mode of each macro block in a B-frame color time-space domain is confirmed according to the just noticeable distortion value of each image block in the just noticeable distortion image of the time-space domain. The macro block mode fast selecting method can effectively save encoding time of color videos on the premise that color video visual perception quality is guaranteed and greatly reduces the encoding complexity level of the color videos, and saved encoding time can reach to 72.7% averagely.

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13-10-2016 дата публикации

Objective assessment method for stereoscopic video quality based on wavelet transform

Номер: US20160300339A1
Принадлежит: Ningbo University

An objective assessment method for a stereoscopic video quality based on a wavelet transform fuses brightness values of pixels in a left viewpoint image and a right viewpoint image of a stereoscopic image in a manner of binocular brightness information fusion, and obtains a binocular fusion brightness image of the stereoscopic image. The manner of binocular brightness information fusion overcomes a difficulty in assessing a stereoscopic perception quality of a stereoscopic video quality assessment to some extent and effectively increases an accuracy of a stereoscopic video objective quality assessment. When weighing qualities of each frame group in a binocular fusion brightness image video corresponding to a distorted stereoscopic video, the objective assessment method fully considers a sensitivity degree of a human eye visual characteristic to various types of information in the video, and determines a weight of each frame group based on a motion intensity and a brightness difference.

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08-05-2013 дата публикации

Multi-view video rate control method based on exactly perceptible distortion

Номер: CN103096079A
Принадлежит:

The invention discloses a multi-view video rate control method based on exactly perceptible distortion. An exactly perceptible distortion value can be obtained according to characteristics of visual system of human beings. Rate control is performed quantificationally in a multi-view video, namely, according to an frame I or frame P image, a quantization parameter is determined according to an average value of quantization parameters of frame B images of a last image set and according to a Frame B image, due to calculation of the number of target bits distributed to the Frame B image in advance and calculation of the number of the target bits distributed to each macro block of the Frame B image in advance, a mean absolute error of each macro block is corrected combined with the exactly perceptible distortion value. Then according to a secondary model of a code rate-quantization parameter, a quantization parameter of each macro block is calculated. According to the code control method, under ...

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19-09-2012 дата публикации

Depth and color code rate distribution method for three-dimensional video coding

Номер: CN102685531A
Принадлежит:

The invention discloses a depth and color code rate distribution method for three-dimensional video coding. Under the condition of obtaining the optimum virtual viewpoint drawing quality, a relation model of coding quantitative step sizes of original left viewpoint color videos and original right viewpoint color videos and coding quantitative step sizes of original left viewpoint depth videos and original right viewpoint depth videos is built in a secondary fitting method, further color and depth bit distribution is described as a standard univariate cubic equation, the optimum original coding quantitative parameters after coding of the original left viewpoint color videos, the original right viewpoint color videos, the original left viewpoint depth videos and original right viewpoint depth videos under a certain code rate are obtained, and finally the optimum original coding quantitative parameters are used for coding the original left viewpoint color videos, the original right viewpoint ...

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12-09-2012 дата публикации

Stereo image objectivity quality evaluation method based on visual perception

Номер: CN102663747A
Принадлежит:

The invention discloses a stereo image objectivity quality evaluation method based on visual perception. Based on two parts of a left and right viewpoint image quality and depth perception, the left and right viewpoint image quality is used to capture multi-scale structure information so that a difference of a structure similarity of an original and distortion stereo image pair can be effectively reflected. The stereo depth perception is caused by the subtle difference existed in the image seen by left and right eyes of human beings. Through comparing a brightness distortion of original and distortion absolute difference value images, a structure distortion and a sensitivity distortion, a depth perception evaluation value can be acquired. Then, nonlinear fitting is performed on the evaluation values of the two parts so as to obtain a final stereo image quality evaluation index. Because the method combines the specific depth perception characteristic of the stereo image and a objective evaluation ...

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10-10-2012 дата публикации

Depth video coding method on basis of foveal JND (just noticeable distortion) model

Номер: CN102724525A
Принадлежит:

The invention discloses a depth video coding method on the basis of a foveal JND (just noticeable distortion) model. The depth video coding method comprises the following steps of: firstly, calculating the global JND of each pixel in each frame in a middle virtual viewpoint video obtained by carrying out middle virtual viewpoint rendering on color videos at left and right viewpoints and depth videos at left and right viewpoints; then, according to the global JND, obtaining a middle virtual viewpoint video subjected to geometrical offset; according to the geometrical offset, obtaining the maximum tolerable distortion video of the depth video at the left viewpoint; and finally, obtaining increasable coded quantization parameters of each macro block in each frame of the depth video at the left viewpoint according to the maximum tolerable distortion video. According to the method disclosed by the utility model, on the premise of maintaining the visual perception quality of virtual viewpoints ...

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11-12-2013 дата публикации

Method for quickly coding multi-view color videos based on binocular just perceptible distortion

Номер: CN103442226A
Принадлежит:

The invention discloses a method for quickly coding multi-view color videos based on binocular just perceptible distortion. The method includes the first step of utilizing parallax error information the left view video and the right view video to determine a binocular just perceptible distortion value of each macro block within a non-boundary area in each frame of right view image in the right view video, and the second step of terminating macro block mode selection in advance according to the binocular just perceptible distortion value. On the basis of not causing rate-distortion performance degradation, the method for quickly coding the multi-view color videos can effectively improve coding efficiency of the multi-view color videos. The saved coding time can reach to 66.48% to 71.90%, and saves the coding time by 68.46% on average.

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27-11-2013 дата публикации

Stereoscopic video bitrate control method based on binocular just-noticeable distortion

Номер: CN103414889A
Принадлежит:

The invention discloses a stereoscopic video bitrate control method based on binocular just-noticeable distortion. Bitrate control is performed through a viewpoint layer, a group of picture layer, a frame layer and a macro-block layer. In the viewpoint layer, a first group of picture is pre-coded to obtain bitrate allocation weight of left and right viewpoints; in the group of picture layer, the target number of bits is allocated for each group of picture according to the remaining number of bits in the viewpoints, a frame rate, the length of the groups of picture and a buffer occupancy rate, and an encoding quantization parameter of a key frame in each group of picture is determined; in the frame layer, the target number of bits is allocated for each frame except the key frame according to the remaining number of bits in the groups of picture and the buffer occupancy rate; and in the macro-block layer, the target number of bits allocated to each macro-block in each frame except the key ...

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16-10-2013 дата публикации

Boundary strength compressing image quality objective evaluation method based on DCT domain

Номер: CN103354617A
Принадлежит:

The invention discloses a boundary strength compressing image quality objective evaluation method based on a DCT domain. First, overall boundary strengths of luminance component charts of an undistorted image and a distorted image are obtained through obtaining four-direction coefficient matrixes of the luminance component charts of the undistorted image and the distorted image respectively. Second, sensitive factors of each area in the distorted image are obtained through obtaining mean value, standard deviation and variance of each 8*8 half-overlapping block in the two overall boundary strengths. Then, energy similarity of two half-overlapping blocks corresponding to the two overall boundary strengths is obtained through obtaining DCT coefficient matrixes of the both of the half-overlapping blocks in the two overall boundary strengths. Finally, a quality evaluation score of the distorted image is obtained according to the sensitive factors and the energy similarity. Since vision redundant ...

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03-04-2013 дата публикации

Free viewpoint video whole-frame loss error concealment method

Номер: CN103024402A
Принадлежит:

The invention discloses a free viewpoint video whole-frame loss error concealment method, which comprises the following steps of: performing bidirectional motion compensation restoration on each image block in a lost frame by fully utilizing a forward reference color image and a backward reference color image in the lost frame time domain according to a prediction relationship of an encoding prediction structure; performing bidirectional parallax compensation restoration on each image block in the lost frame by fully utilizing a left reference color image and a right reference color image in the lost frame viewpoint domain aiming at multiple viewpoints in the free video system; and obtaining a final restoration frame according to the bidirectional motion compensation restoration result and bidirectional parallax compensation restoration result. According to the restoration mode, the reconstruction quality of the image video after error concealment is greatly improved; and moreover, the ...

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22-06-2017 дата публикации

Image quality objective evaluation method based on manifold feature similarity

Номер: US20170177975A1
Принадлежит: Ningbo University

An image quality objective evaluation method based on manifold feature similarity is disclosed, which firstly adopts visual salience and visual threshold to remove image blocks which are unimportant to visual perception, namely, uses roughing selection and fine selection; and then utilizes the best mapping matrix after block selection to extract manifold feature vectors of image blocks which are selected from original undistorted natural scene images and distorted images to be evaluated; and then measures the structural distortion of distorted images according to manifold feature similarity; and then considers effects of image brightness changes on human eyes and obtains the brightness distortion of distorted images based on an average value of image blocks, and finally obtains quality scores according to structural distortion and brightness distortion; which allows the method of the present invention to have a higher evaluation accuracy, and also expands the evaluation capacity to various distortions. 5. The image quality objective evaluation method based on manifold feature similarity claim 3 , as recited in claim 3 , wherein in the step (A) of the step (5) claim 3 , TH=median(v) claim 3 , here claim 3 , median( ) is a median selection function claim 3 , median(v) represents selecting a mid-value of values of all elements in v.6. The image quality objective evaluation method based on manifold feature similarity claim 4 , as recited in claim 4 , wherein in the step (A) of the step (5) claim 4 , TH=median(v) claim 4 , here claim 4 , median( ) is a median selection function claim 4 , median(v) represents selecting a mid-value of values of all elements in v.7. The image quality objective evaluation method based on manifold feature similarity claim 3 , as recited in claim 3 , wherein in the step (e) of the step (5) claim 3 , a value of THis a maximum value at a former 60% position after arranging all maximum values obtained in the step (d) from big to small.8. The ...

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15-01-2014 дата публикации

Method for objectively evaluating quality of degraded reference three-dimensional picture

Номер: CN103517065A
Принадлежит:

The invention discloses a method for objectively evaluating the quality of a degraded reference three-dimensional picture. An evaluation indicator of the method is composed of two parts including left-right view point picture quality and depth sensing. According to the method, the multi-channel character after wavelet decomposition is carried out on a left view point and a right view point of the three-dimensional picture, and the character that a picture category which can be represented by a picture singular value has high stability are utilized, and singular value decomposition is carried out on sub-bands. The characteristics of the picture are extracted through the singular value obtained after decomposition serve as a characteristic value of a semi-reference model. Weighting is carried out on the characteristic values of the sub-bands due to combination of information entropy and contrast sensitivity characters, and a final result is obtained. According to the method, transmission ...

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09-10-2013 дата публикации

Method for obtaining definition of microscopic image

Номер: CN103345728A
Принадлежит:

The invention discloses a method for obtaining the definition of a microscopic image. The method for obtaining the definition of the microscopic image includes the steps of firstly, extracting a dim channel image of an original microscopic image, then obtaining a transmission attenuation image and an illumination-separated source image, and lastly, calculating and obtaining the definition of the source image on the basis of the source image through object location. By means of the method for obtaining the definition of the microscopic image, the influence of ambient illumination to the calculation of the definition of the microscopic image is eliminated effectively, and the calculated definition has a robust influence on illumination. In addition, the method for obtaining the definition of the microscopic image is low in calculation complexity.

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03-10-2012 дата публикации

Stereoscopic image objective quality evaluation method on basis of structural distortion

Номер: CN102708568A
Принадлежит:

The invention discloses a stereoscopic image objective quality evaluation method on the basis of the structural distortion, which comprises the following steps: firstly, respectively carrying out regional division on left and right viewpoint images of an undistorted stereoscopic image and a distorted stereoscopic image to obtain an eye sensitive region and a corresponding nonsensitive region and then respectively obtaining evaluation indexes of the sensitive region and the nonsensitive region from two aspects of the structural amplitude distortion and the structural direction distortion; secondly, acquiring quality evaluation values of the left and right viewpoint images; thirdly, sampling singular value difference and a mean deviation ratio of residual images of which singular values are deprived to evaluate the distortion condition of the depth perception of a stereoscopic image so as to obtain an evaluation value of stereoscopic perceived quality; and finally, combining the quality of ...

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21-11-2012 дата публикации

Method for detecting parfocality of continuous zoom stereo microscope

Номер: CN102788682A
Принадлежит:

The invention discloses a method for detecting the parfocality of a continuous zoom stereo microscope. Four definition critical functions are used for jointly obtaining four maximum definition values corresponding to multiple frames of images; according to the four maximum definition values, determining the relatively clearest position; through comparing the definition value of the clearest position and the definition value of a focus-joint position, judging whether the clearest position is the focus-joint position; and then, through adjusting the zoom ratio, obtaining the focus-joint position under finite number of dispersion zoom ratio; and finally, obtaining a parfocalization curve under continuous zoom ratio. The method disclosed by the invention can automatically realize detection of the parfocality of the stereo microscope, has high detection accuracy and can efficiently improve the production efficiency; in addition, the method disclosed by the invention requires no frequent intervention ...

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07-11-2012 дата публикации

Method for processing multi-viewpoint depth video

Номер: CN102769746A
Принадлежит:

The invention discloses a method for processing a multi-viewpoint depth video. The method comprises the steps as follows: recombination conversion operation is executed aiming at the depth video; secondly, the converted depth video is smoothly processed in a time domain; thirdly, recombination conversion operation is executed aiming at the smoothly processed depth video to obtain a pretreated depth video; fourthly, coding compression, decoding recombination operation are executed aiming at the pretreated multi-viewpoint depth video; fifthly, depth recovery and null field smooth processing are executed aiming at decoded and recombined multi-viewpoint depth video; and lastly, a virtual viewpoint video image is mapped by the processed multi-viewpoint depth video. The method has the advantages that the pretreatment method can improve the time domain relativity of a depth video sequence, and further effectively improve the coding efficiency of the depth video; as for the situation of a code ...

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29-07-2015 дата публикации

Stereoscopic video quality objective evaluation method based on wavelet transformation

Номер: CN104811691A
Принадлежит:

The invention discloses a stereoscopic video quality objective evaluation method based on wavelet transformation. Brightness value of pixel points in a left view point image and brightness value of pixel points in a right view point image in stereo images are fused by means of a binocular brightness information fusion mode to obtain a binocular fusion brightness image of the stereo images, the problem of difficult stereo perceived quality evaluation in stereoscopic video quality evaluation can be solved to a certain degree, the accuracy of stereoscopic video objective quality evaluation is effectively improved, when weighting is performed on qualities of each frame group in binocular fusion brightness image video that distorted stereoscopic video corresponds to, sensitivity level of human eye visual characteristics to all kinds of information in videos is fully considered, weight of each frame group is determined by means of sports intensity and brightness difference, and thereby, the stereoscopic ...

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22-01-2014 дата публикации

High-definition video fast coding method

Номер: CN103533354A
Принадлежит:

The invention discloses a high-definition video fast coding method. According to the method, the whole process is divided into an off-line training stage and a threshold value on-line use stage, and in the off-line training stage, the unified optimal cutting threshold value of a coding unit in the size being 64*64, the unified optimal cutting threshold value of a coding unit in the size being 32*32 and the unified optimal cutting threshold value of a coding unit in the size being 16*16 in each type of video sequence are obtained; in the threshold value on-line use stage, according to the optimal cutting threshold values and the rate-distortion generation values of coding units in the sizes being 64*64, 32*32 and 16*16 in an HEVC (high efficiency video coding) high-definition video to be processed, whether the coding units in the sizes being 64*64, 32*32 and 16*16 in the HEVC high-definition video to be processed need to be continuously cut or not is determined. The mode has the advantages ...

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25-12-2013 дата публикации

HBP coding format oriented stereoscopic video B frame loss error concealment method

Номер: CN103475884A
Принадлежит:

The invention discloses an HBP coding format oriented stereoscopic video B frame loss error concealment method. According to the method, full consideration is given to influences of loss of B frames in different levels on video quality of a decoding end, the B frames are layered and divided into a core frame, a secondary core frame and a common frame according to different positions of the B frames in decoding, then loss B frames are divided into a background region and a foreground region, the foreground region of the secondary core frame and the foreground region of the common frame are divided into a strong motion related region and a weak motion related region, and different error concealment methods are adopted to carry out error concealment on different regions. According to the method, the defect that a single method is adopted in an existing B frame loss error concealment method for B frames of different levels of significance is overcome, and quality of stereoscopic video restoring ...

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20-03-2013 дата публикации

Stereo image objective quality evaluation method base on matrix decomposition

Номер: CN102982532A
Принадлежит:

The invention discloses a stereo image objective quality evaluation method base on matrix decomposition which is designed from the aspect of structure distortion, capable of effectively using singular value stability, well representing stereo image structure information, making use of the fact that a hessian matrix can well represent of image texture or bump, making use of the fact that singular value can well represent structure information of an absolute difference value figure, fully considering sensitivity of a human eye to an area, integrating stereo image quality and depth perception quality, effectively improving relevance between stereo image objective quality evaluation result and subjective perception, accurately measuring distortion degree of the stereo image, and providing a performance evaluation criterion for an encoding method, a drawing method, an error hiding method and the like in a stereo system.

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05-06-2013 дата публикации

Processing method of multi-visual image

Номер: CN103139522A
Принадлежит:

The invention discloses a processing method of a multi-visual image. Firstly, building a color mapping relation of a source image and a target image by the adoption of a histogram matching method, and inserting a watermark image which is to be inserted into the source image according to gamma correction to obtain the source image inserted with watermark; carrying out coding transmission on the source image inserted with the watermark and the target image, and designing two methods which are color correction and copyright protection to process the source image inserted with the watermark after decoding. By the adoption of processing method, the accuracy of the color correction of the multi-visual image is guaranteed, simultaneously, the copyright protection of the multi-visual image can be effectively protected, and effectiveness of a multi-visual video system is improved.

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10-10-2012 дата публикации

H.264-based stereoscopic video code rate control method

Номер: CN102724524A
Принадлежит:

The invention discloses an H.264-based stereoscopic video code rate control method, which comprises the following steps: firstly calculating initial coding quantization parameters of stereoscopic image groups according to the useful channel bandwidth and the length of the stereoscopic image groups, then coding by directly utilizing the initial coding quantization parameters of the stereoscopic image groups aiming at a first image pair and a second image pair, enabling a third image pair, pre-distributing target bit numbers to the image pairs, calculating coding quantization parameters of left and right viewpoint images in the image pairs and updating rest bit numbers in the stereoscopic image groups. The stereoscopic video code rate control method has the advantages that through considering the coding complexity and the position importance of the images, reference characteristics between the left and the right viewpoint images and other factors, the target bit numbers are more reasonably ...

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23-10-2013 дата публикации

Three-dimensional image quality objective evaluation method based on regional importance classification

Номер: CN103369348A
Принадлежит:

The invention discloses a three-dimensional image quality objective evaluation method based on the regional importance classification. The method comprises the following steps of firstly respectively calculating a one-eyed figure of the original distortion-free three-dimensional image and a one-eyed figure of the to-be-evaluated distorted three-dimensional image, calculating a structural distortion figure between the two one-eyed figures and a three-dimensional remarkable figure of the one-eyed figure of the original distortion-free three-dimensional image, dividing the one-eyed figure of the to-be-evaluated distorted three-dimensional image into a remarkable distortion area, a remarkable non-distortion area, a non-remarkable distortion area and a non-remarkable non-distortion area to be evaluated, fusing an objective evaluation measuring value of each area to obtain an image quality objective evaluation prediction value of the to-be-evaluated distorted three-dimensional image. The method ...

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26-06-2013 дата публикации

Signal processing method of interactive three-dimensional video system

Номер: CN103179423A
Принадлежит:

The invention discloses a signal processing method of an interactive three-dimensional video system. The signal processing method comprises the following steps of: firstly, taking multiple virtual viewpoints between each two adjacent reference viewpoints as auxiliary viewpoints, obtaining the residual image of each auxiliary view point, then encoding each color image, each depth image and each residual image by using a three-dimensional video coding module of a server, transmitting each color image, each depth image and each residual image to a user side, decoding each coded image by using a viewpoint decoding module of the user side, finally generating reference viewpoint signals and auxiliary viewpoint signals by any viewpoint drawing modules, and transmitting the reference viewpoint signals and the auxiliary viewpoint signals to a video display module for display. The signal processing method has the advantages that as the server only needs to transmit the residual images containing ...

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13-03-2013 дата публикации

Multi-view video code rate control method based on key frame code rate-quantitative model

Номер: CN102970540A
Принадлежит:

The invention discloses a multi-view video code rate control method based on a key frame code rate-quantitative model. Code rate control is carried out at four layers including a view layer, a GOP layer, a frame layer and a macro block layer, and code rates among view points are allocated according to scale values of actual coding of the view points in the view layer; the total code rate of the whole GOP is allocated in the GOP layer and a coding quantization parameter of the key frame of each GOP is calculated according to the key frame code rate-quantitative model of the key frame, wherein the key frame code rate-quantitative model is obtained through analysis; code rates are allocated in the frame layer according to code rate allocation weights of B frame of different levels reasonably; and code rates of macro blocks are allocated in the macro block layer according to coding complexities of the macro blocks and coding quantization parameters of the macro blocks are solved. The multi-view ...

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11-07-2012 дата публикации

Stereo image objective quality estimation method

Номер: CN102567990A
Принадлежит:

The invention discloses a stereo image objective quality estimation method. The method comprises the following steps of: firstly, performing wavelet transformation on left and right viewpoint images of an undistorted stereo image and a distorted stereo image, extracting the minimum visible error of each sub-band, and calculating the proportion of sensitivity coefficients in an absolute difference value image matrix of each sub-band in the respective sub-band; secondly, obtaining the evaluation of three-dimensional perception quality in a linear combination way by evaluating the direction similarity and the structure similarity of the strong edge and the weak edge of an absolute difference image between the left and right viewpoint images of the undistorted stereo image and the distorted stereo image; and finally, combining the quality of the left and right viewpoint images and the three-dimensional perception quality to obtain the final evaluation result of the stereo image quality. Human ...

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07-11-2012 дата публикации

Post-processing method for depth image

Номер: CN102769749A
Принадлежит:

The invention discloses a post-processing method for a depth image. The method comprises the following steps of: coding an acquired color image and a corresponding depth image to obtain a coded code stream; acquiring a coding distortion compensation parameter of the depth image, and coding the coding distortion compensation parameter of the depth image to obtain a parameter code stream; decoding the coded code stream and the parameter code stream to obtain a decoded color image, a decoded depth image and a decoded coding distortion compensation parameter; and compensating the decoded depth image by using the coding distortion compensation parameter of the depth image to obtain a depth compensated image, and filtering the depth compensated image to obtain a depth filtered image which is used for drawing a virtual viewpoint image. The method has the advantages that the influence of coding distortion on the drawing of the virtual viewpoint image is lowered on the basis of maintaining the compression ...

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10-07-2013 дата публикации

Three-dimensional picture quality objective evaluation method based on three-dimensional visual attention

Номер: CN103200420A
Принадлежит:

The invention discloses a three-dimensional picture quality objective evaluation method based on three-dimensional visual attention. The method comprises the steps of respectively calculating an original undistorted three-dimensional picture one-eyed figure and an one-eyed figure of an anamorphic three-dimensional picture to be evaluated; calculating significant figures of the two one-eyed figures and an off-centering figure, a foreground figure and a background figure of the original undistorted three-dimensional picture one-eyed figure; obtaining a three-dimensional visual attention image, and merging objective evaluation metric values of all pixel points in the one-eyed figure of the anamorphic three-dimensional picture to be evaluated, and obtaining a picture quality objective evaluation predicted value of the anamorphic three-dimensional picture to be evaluated. The three-dimensional picture quality objective evaluation method based on the three-dimensional visual attention has the ...

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13-11-2013 дата публикации

Stereo video bitrate control method based on binocular vision characteristic

Номер: CN103391436A
Принадлежит:

The invention discloses a stereo video bitrate control method based on a binocular vision characteristic. The method is characterized in that bitrate control is conducted on a stereo image group layer, a stereo image pair layer and a frame layer respectively; in the stereo image group layer, the bit number of each stereo image group and a quantization parameter of a key frame are calculated; in the stereo image pair layer, the target bit number of each stereo image pair is calculated according to the surplus bit number and the buffer area saturation; in the frame layer, a stereo index bitrate and quantization parameter model is built according to the human eye binocular vision masking effect to optimize a stereo rate distortion model to enable more target bits to be distributed in a left image and fewer target bits to be distributed in a right image, and finally the quantization parameters of non key frames can be determined. The method has the advantage of effectively improving stereo ...

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24-04-2013 дата публикации

Preprocessing method of multi-view deep video

Номер: CN103067705A
Принадлежит:

The invention discloses a preprocessing method of a multi-view deep video. The preprocessing method of the multi-view deep video divides a deep video frames into a continuous region and discontinuous regions, then divides the continuous region into a foreground region and a background region, and then extracts the edge portions of all the regions to protect, carries out Gaussian filter processing to non-edge portions of the discontinuous regions, respectively carries out self-adaptive window filtering processing to the non-edge portions of the foreground region and the background region of the continuous region, enables all the pixel points inside a self-adaptive window to belong to a same region or an identical type, reduces errors as far as possible, and greatly improves compressed encoding efficiency of a deep video sequence, and saved code flow is up to 8.33% to 34.39%, and meanwhile a peak signal to noise ratio of drawn dummy viewpoints is averagely improved by 0.21 dB.

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22-01-2014 дата публикации

Stereo image quality objective evaluation method based on digital watermarking

Номер: CN103533343A
Принадлежит:

The invention discloses a stereo image quality objective evaluation method based on digital watermarking. The stereo image quality objective evaluation method based on the digital watermarking comprises the following steps of extracting the characteristic of a DCT domain of left and right viewpoint images of an undistorted stereo image from a sending end, and embedding a digital watermark obtained by carrying out quantization coding on the characteristic in the DCT domain; extracting the characteristic of the DCT domain of the left and right viewpoint images of the undistorted stereo image from a receiving end, detecting the digital watermark embedded in the undistorted stereo image and carrying out decoding and inverse quantization on the digital watermark; obtaining a stereo perception value and a viewpoint quality score of the undistorted stereo image according to the extracted characteristic and the characteristic obtained by carrying out the decoding and the inverse quantization; finally ...

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19-06-2013 дата публикации

Stereoscopic video whole frame loss error hiding method based on structural similarity

Номер: CN103167291A
Принадлежит:

The invention discloses a stereoscopic video whole frame loss error hiding method based on structural similarity. The stereoscopic video whole frame loss error hiding method based on the structural similarity is effectively combined with subjective perceptions from human eyes to picture structure information, respectively uses a motion compensation forecasting method or a parallax compensation forecasting method to recover errors aiming at different macro block reference modes of macro blocks in a dropped frame by judging the macro block reference modes of reference image frames of a moment before the dropped frame, and further is intensively combined with the subjective perceptions from the human eyes to picture structure similarity due to the fact that time domain pertinence and pertinences among viewpoints of traditional stereoscopic video are fully considered, and therefore not only objective quality of recovering of the dropped frame can be improved, but also subjective quality of ...

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23-10-2013 дата публикации

Post-processing method of range image

Номер: CN103369341A
Принадлежит:

The invention discloses a post-processing method of a range image. A processing process comprises the following steps of firstly, decoding to obtain a color image and a corresponding range image on a decoding end; secondly, determining a neighboring window of each pixel point in the range image obtained through decoding according to an intersection rule based on a confidence interval; thirdly, estimating a depth value of each pixel point in the range image obtained through decoding by utilizing an error of mean square of a minimum approximate polynomial so as to obtain a depth estimation image; and lastly, filtering each pixel point in the depth estimation image by utilizing a weighting mode filter so as to obtain a depth filtering image used for drawing a virtual viewpoint image. The post-processing method has the advantages that through utilizing two depth post-processing technologies including the error of mean square of the minimum approximate polynomial and the weighting mode filter ...

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04-09-2013 дата публикации

Video objective quality evaluation method based on human eye visual characteristics

Номер: CN103281554A
Принадлежит:

The invention discloses a video objective quality evaluation method based on human eye visual characteristics. According to the method, images in distortion video sequences are divided into edge, vein and smooth regions, then, distortion images can be just detected according to the time domain of images in the non-distortion video sequence, pixel points in the edge region are divided into visible and invisible distortion points, then, the visible and invisible distortion points are subjected to sensing weighting to different degrees, then, the quality marks of the images in the distortion video sequences are obtained according to the structure similarity value of each pixel point in the edge region after the sensing weighting and the structure similarity value of each pixel point in the vein region and the smooth region, finally, the total quality evaluation objective value of the distortion video sequence is obtained according to the quality mark after the low-pass filtering, in the whole ...

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01-08-2012 дата публикации

Microscopic image fusion method based on region growth

Номер: CN102622737A
Принадлежит:

The invention discloses a microscopic image fusion method based on region growth. Definition evaluation is performed on image blocks in microscopic images so as to judge fuzzy degree of the microscopic images and confirm fuzzy seed blocks, the region growth is used for gradually completing accurate division and marking of fuzzy regions and clear regions simultaneously, and finally a clear high-quality microscopic image formed by fusing a plurality of microscopic images is obtained through a fusion rule of the microscopic images. The microscopic image fusion method based on region growth has the advantage that the clear regions and the fuzzy regions of the microscopic images are divided by combining the definition evaluation of the microscopic images and performing the region growth. Microscopic image fusion results of the method show great superiority in the aspects of subjective human eye perception and objective evaluation index. The microscopic image fusion method based on region growth ...

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25-09-2013 дата публикации

Three-dimensional image fragile watermark method based on joint just noticeable distortion

Номер: CN103325084A
Принадлежит:

The invention discloses a three-dimensional image fragile watermark method based on joint just noticeable distortion and in particular relates to a three-dimensional image location tampering and restoring fragile watermark algorithm based on JJND (Joint Just Noticeable distortion). Firstly, a three-dimensional image block is divided into a relative sensitive block and a relative insensitive block according to a JJND model and the number of three-dimensional image match blocks, then discrete cosine transform and quantization compression are carried out on the image blocks to generate watermarks, and unsymmetrical watermark embedding of different type blocks of the three-dimensional image is built according to the JJND model and types of the image blocks. Restored watermarks can be used for locating the positions of the tampered portions to further improve transparency of the image. Meanwhile, copy embedding of the restored watermarks in the three-dimensional image can improve the capacity ...

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30-01-2013 дата публикации

Color correction method of colored microscopic three-dimensional image pair

Номер: CN102905140A
Принадлежит:

The invention discloses a color correction method of a colored microscopic three-dimensional image pair. Color transfer is carried out by separating color information of foreground regions and background regions in a reference image and a color-to-be-corrected image, and the wrong transfer of the color information in different regions of the image pair can be avoided, so that the precision of the color correction can be greatly improved, the color difference between the reference image and the color-to-be-corrected image is narrowed, the better foundation is built for the stereo matching of the colored microscopic three-dimensional image pair, and meanwhile, guarantees are provided to three-dimensional reconstruction and three-dimensional measurement; and furthermore, in the whole image color correction process, the intervention of a user is unnecessary, and the whole color correction process can be automatically finished.

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22-01-2014 дата публикации

Quick coding method for HEVC (high efficiency video coding)

Номер: CN103533355A
Принадлежит:

The invention discloses a quick coding method for HEVC (high efficiency video coding). A prediction maximum coding unit is subjected to quadtree structure type analysis to quickly obtain a type value which shows the depth traversal interval of the current maximum coding unit; in the process of obtaining the type value, because the current maximum coding unit and an adjacent coded maximum coding unit as well as the maximum coding units with the same coordinate position in a forward-direction reference frame and a backward-direction reference frame have big correlation, the type value of the depth traversal interval of the maximum coding unit is predicted to obtain the type value of the depth traversal interval of the current maximum coding unit; therefore, unnecessary depth traversals in the current maximum coding unit division process are avoided; on the premise of guaranteeing the video quality and the constant code rate, the coding computation complexity is effectively lowered.

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07-08-2013 дата публикации

Stereoscopic video macroblock loss error concealment method

Номер: CN103237226A
Принадлежит:

The invention discloses a stereoscopic video macroblock loss error concealment method. The stereoscopic video macroblock loss error concealment method includes firstly determining the lost macroblocks belong to a left boundary shielding area, a right boundary shielding area or a non-boundary shielding area; then classifying the lost macroblocks belonging to the non-boundary shielding area as motion macroblocks or static macroblocks according to motion and static features of the macroblocks; utilizing a human sight sensitivity feature of the macroblocks to classify the motion macroblocks as sensitive macroblocks and insensitive macroblocks; then utilizing texture and smooth features of the macroblocks to classify the sensitive macroblocks as texture macroblocks and smooth macroblocks; and utilizing manners of time domain compensation prediction, time domain frame copy, parallax compensation prediction, multi-direction interpolation and linear interpolation to restore the lost macroblocks ...

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29-08-2013 дата публикации

Microscopic image fusion method based on region growing

Номер: US20130223760A1
Принадлежит:

A microscopic image fusion method based on region growing judges the fuzzy degree of the microscopic image and determines the fuzzy seed block by evaluating the definition of every image block in the microscopic image. Then, the fuzzy region and clear region are exactly segmented by region growing and are marked. Finally, a clear and high-quality microscopic image, fused by a plurality of microscopic images, is obtained. Due to the combination of the definition evaluation of the microscopic image, and segmentation of the fuzzy region and clear region by region growing, the fusion results of the microscopic image of the present invention show great advantages at the subjective human perception and the objective evaluation. Furthermore, the present invention has simple calculation and stable result, is easy to be implemented and adapted for fusing the digital optical microscopic images which are shot by shallow depth of field. 3. The microscopic image fusion method based on region growing claim 1 , as recited in claim 1 , wherein in step (4) claim 1 , a concrete process of determining the first decision threshold Tof the definition characteristic value corresponding to every first image block in the {I(x claim 1 ,y)} comprises steps of: (4-a1) sequencing the definition characteristic value corresponding to every first image block in the {I(x claim 1 ,y)} claim 1 , finding out a maximum definition characteristic value and a minimum characteristic value claim 1 , and respectively recording the maximum definition characteristic value and the minimum characteristic value as Fand F; and (4-a2) calculating the first decision threshold T claim 1 , wherein T=F+(F−F)×w claim 1 , here claim 1 , wis a weight factor;{'sub': n', {'sub2': '—'}, '2', 'S2', 'S2', 'v2', {'sub2': '—'}, 'n', {'sub2': '—'}, 'MAX', 'v2', {'sub2': '—'}, 'n', {'sub2': '—'}, 'MIN', 'n', {'sub2': '—'}, '2', 'n', {'sub2': '—'}, '2', 'v2', {'sub2': '—'}, 'n', {'sub2': '—'}, 'MIN', 'v2', {'sub2': '—'}, 'n', {' ...

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30-01-2014 дата публикации

Method for detecting parfocality of zoom-stereo microscope

Номер: US20140029000A1
Принадлежит: Ningbo University

A method for detecting a parfocality of a zoom-stereo microscope includes: acquiring four highest definitions corresponding to a plurality of images with a cooperation of four definition judging functions, acquiring a relatively clearest position according to the four highest definitions, comparing a definition in the relatively clearest position with a definition in a parfocal position to judge whether the relatively clearest position is the parfocal position, then adjusting a magnification of the zoom-stereo microscope to acquire the parfocal positions at a finite number of the discrete magnifications, and finally fitting a parfocal curve at the continuous magnifications. The method according to the present invention implements a parfocality detection of the stereo microscope automatically and effectively and increases a productivity, and has a high detecting precision. In addition, the method according to the present invention has a good robustness, so that users needn't intervene and adjust frequently. 1. A method for detecting a parfocality of a zoom-stereo microscope , comprising:{circle around (1)} turning a magnification knob of the zoom-stereo microscope, and adjusting a magnification thereof to M;{'sub': s', 'Mθ', {'sub2': 's'}, 'k', 's', 's, '{circle around (2)} turning a focusing knob of the zoom-stereo microscope, particularly turning clockwise or counterclockwise from a benchmark position, and then acquiring Q groups of images corresponding to Q different focusing knob angles, wherein each group consists of T images, a No. k image in the T images acquired at the magnification of M and the focusing knob angle of θis denoted as I, Q≧7, T≧3, 1≦s≦Q, 1≦k≦T, when the focusing knob is turned clockwise, −5°≦θ≦0°, and when the focusing knob is turned counterclockwise, 0°≦θ≦5°;'}{circle around (3)} respectively calculating definitions of the Q×T images acquired at Q different focusing knob angles and the magnification of M, according to four definition judging ...

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06-03-2014 дата публикации

Method for objectively evaluating quality of stereo image

Номер: US20140064604A1
Принадлежит: Ningbo University

A method for objectively evaluating quality of a stereo image is provided. The method obtains a cyclopean image of a stereo image formed in the human visual system by simulating a process that the human visual system deals with the stereo image. The cyclopean image includes three areas: an occlusion area, a binocular fusion area and a binocular suppression area. Representing characteristics of the image according to the singular value of the image has a strong stability. According characteristics of different areas of the human visual system while dealing with the cyclopean image, the distortion degree of the cyclopean image corresponding to the testing stereo image is presented by the singular value distance between cyclopean images respectively corresponding to the testing stereo image and the reference stereo image, in such a manner that an overall visual quality of the testing stereo image is finally evaluated. 2. The method for objectively evaluating quality of a stereo image claim 1 , as recited in claim 1 , wherein specific process of the step {circle around (2)} comprises:{'sub': l', 'x,y', 'r', 's,t', 'l', 'x,y', 'r', 's,t, 'sup': l', 'r', 'l', 'r, '{circle around (2)}-1 denoting a pixel having a position coordinate of (x,y) in the left-view image Iof the reference stereo image as p, denoting a pixel having a position coordinate of (s,t) in the right-view image Iof the reference stereo image as p, denoting a pixel having a position coordinate of (x,y) in the left-view image Îof the testing stereo image as {circumflex over (p)}, and denoting a pixel having a position coordinate of (s,t) in the right-view image Îof the testing stereo image as {circumflex over (p)}, wherein 1≦x≦W, 1≦y≦H, 1≦s≦W and 1≦t≦H;'}{circle around (2)}-2 processing stereo matching on the reference stereo image, so as to obtain a horizontal disparity and a vertical disparity of each pixel of the reference stereo image, wherein a specific process thereof comprises:{'sub': x,y', 's,t, 'sup ...

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02-04-2015 дата публикации

Digital watermarking based method for objectively evaluating quality of stereo image

Номер: US20150093016A1
Принадлежит: Ningbo University

A digital watermarking based method for objectively evaluating quality of stereo image includes: at transmitting terminal, extracting characteristics of the left-view image and the right-view image of an undistorted stereo image in DCT domain and embedding digital watermarking obtained by processing quantization coding on the characteristics into the DCT domain; at a receiving terminal, detecting the digital watermarking embedded in the distorted stereo image and processing decoding and inverse quantization to extract the embedded characteristics of the left-view image and the right-view image of the stereo image, obtaining a stereo perception value and a view quality value of the distorted stereo image according to the embedded characteristics, and finally obtaining an objective quality score of the distorted stereo image utilizing a support vector regression model.

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19-06-2014 дата публикации

Method of color correction of pair of colorful stereo microscope images

Номер: US20140169661A1
Принадлежит: Ningbo University

A method for color correction of a pair of colorful stereo microscope images is provided, which transmits the color information of the foreground areas and the background area of the reference image to the aberrated image separately for avoiding transmission error of the color information of the varied areas of the pair of the images, thus sufficiently improves the accuracy of the color correction, reduces the difference between the color of the reference image and the color of the aberrated image, and well prepares for the stereo matching of the pair of colorful stereo microscope images as well as for the three-dimensional reconstruction and three-dimensional measurement; on the other hand, during the correction, the correcting procedure is provided automatically without manual work. 1. A method for color correction of a pair of colorful stereo microscope images , comprising steps of:{'sup': ref', 'sou, 'a) taking a first image of a pair of the colorful stereo microscope images in the RGB color space as a reference image I, and taking a second image of the pair of the colorful stereo microscope images in the RGB color space as an uncorrected image I;'}{'sup': ref', 'sou', 'ref', 'sou', 'ref', 'sou', 'ref', 'sou', 'ref', 'sou', 'ref', 'sou', 'ref', 'ref', 'sou', 'sou', 'ref', 'sou, 'sub': i′', 'i′, 'b) obtaining a first saliency map of the reference image Iand a second saliency map of the uncorrected image I, wherein the first saliency map is marked as SaliencyMapand the second saliency map is marked as SaliencyMap; obtaining a first segmentation map of the reference image Iand a second segmentation map of the uncorrected image Iwith the first saliency map of the reference image Iand the second saliency map of the uncorrected image Irespectively, wherein the first segmentation map is marked as BMapand the second segmentation map is marked as BMap, wherein the BMapand the BMapall comprise a plurality of foreground areas, the i′th foreground area of the BMapis marked ...

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10-02-2015 дата публикации

Method for objectively evaluating quality of stereo image

Номер: US8953873B2
Принадлежит: Ningbo University

A method for objectively evaluating quality of a stereo image is provided. The method obtains a cyclopean image of a stereo image formed in the human visual system by simulating a process that the human visual system deals with the stereo image. The cyclopean image includes three areas: an occlusion area, a binocular fusion area and a binocular suppression area. Representing characteristics of the image according to the singular value of the image has a strong stability. According characteristics of different areas of the human visual system while dealing with the cyclopean image, the distortion degree of the cyclopean image corresponding to the testing stereo image is presented by the singular value distance between cyclopean images respectively corresponding to the testing stereo image and the reference stereo image, in such a manner that an overall visual quality of the testing stereo image is finally evaluated.

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28-04-2015 дата публикации

Method for detecting parfocality of zoom-stereo microscope

Номер: US9019487B2
Принадлежит: Ningbo University

A method for detecting a parfocality of a zoom-stereo microscope includes: acquiring four highest definitions corresponding to a plurality of images with a cooperation of four definition judging functions, acquiring a relatively clearest position according to the four highest definitions, comparing a definition in the relatively clearest position with a definition in a parfocal position to judge whether the relatively clearest position is the parfocal position, then adjusting a magnification of the zoom-stereo microscope to acquire the parfocal positions at a finite number of the discrete magnifications, and finally fitting a parfocal curve at the continuous magnifications. The method according to the present invention implements a parfocality detection of the stereo microscope automatically and effectively and increases a productivity, and has a high detecting precision. In addition, the method according to the present invention has a good robustness, so that users needn't intervene and adjust frequently.

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28-07-2015 дата публикации

Digital watermarking based method for objectively evaluating quality of stereo image

Номер: US9094665B2
Принадлежит: Ningbo University

A digital watermarking based method for objectively evaluating quality of stereo image includes: at transmitting terminal, extracting characteristics of the left-view image and the right-view image of an undistorted stereo image in DCT domain and embedding digital watermarking obtained by processing quantization coding on the characteristics into the DCT domain; at a receiving terminal, detecting the digital watermarking embedded in the distorted stereo image and processing decoding and inverse quantization to extract the embedded characteristics of the left-view image and the right-view image of the stereo image, obtaining a stereo perception value and a view quality value of the distorted stereo image according to the embedded characteristics, and finally obtaining an objective quality score of the distorted stereo image utilizing a support vector regression model.

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16-12-2014 дата публикации

Microscopic image fusion method based on region growing

Номер: US8913848B2
Принадлежит: Ningbo University

A microscopic image fusion method based on region growing judges the fuzzy degree of the microscopic image and determines the fuzzy seed block by evaluating the definition of every image block in the microscopic image. Then, the fuzzy region and clear region are exactly segmented by region growing and are marked. Finally, a clear and high-quality microscopic image, fused by a plurality of microscopic images, is obtained. Due to the combination of the definition evaluation of the microscopic image, and segmentation of the fuzzy region and clear region by region growing, the fusion results of the microscopic image of the present invention show great advantages at the subjective human perception and the objective evaluation. Furthermore, the present invention has simple calculation and stable result, is easy to be implemented and adapted for fusing the digital optical microscopic images which are shot by shallow depth of field.

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19-05-2015 дата публикации

Method of color correction of pair of colorful stereo microscope images

Номер: US9036901B2
Принадлежит: Ningbo University

A method for color correction of a pair of colorful stereo microscope images is provided, which transmits the color information of the foreground areas and the background area of the reference image to the aberrated image separately for avoiding transmission error of the color information of the varied areas of the pair of the images, thus sufficiently improves the accuracy of the color correction, reduces the difference between the color of the reference image and the color of the aberrated image, and well prepares for the stereo matching of the pair of colorful stereo microscope images as well as for the three-dimensional reconstruction and three-dimensional measurement; on the other hand, during the correction, the correcting procedure is provided automatically without manual work.

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