PROCESS AND DEVICE OF CODING Of a SEQUENCE Of IMAGES IMPLEMENTING a TEMPORAL PREDICTION, SIGNAL, DATA CARRIER, PROCESS AND DEVICE OF DECODING, AND PRODUCED COMPUTER PROGRAM CORRESPONDENTS

L'invention concerne un procédé de codage d'une séquence d'images, comprenant une étape de codage d'au moins un bloc d'une image courante de la séquence, mettant en oeuvre une prédiction (11) associant le bloc à au moins un bloc correspondant dans une image de référence. Selon l'invention, la prédiction (11) comprend les étapes suivantes, pour au moins un bloc donné de l'image courante ou de l'image de référence : - détermination (111) d'une pluralité de vecteurs de contrôle pour le bloc ; - au moins un découpage (112) du bloc en sous-blocs ; - détermination (113) d'une pluralité de vecteurs de contrôle pour les sous-blocs ; - détermination (114) d'une valeur de prédiction pour au moins un point de l'image courante. De plus, le procédé comprend une étape d'insertion, dans un signal représentatif de la séquence, d'informations de reconstruction des vecteurs de contrôle pour le bloc donné. The invention relates to a method for coding an image sequence, comprising a step of coding at least one block of a current image of the sequence, implementing a prediction (11) associating the block with at least one a corresponding block in a reference image. According to the invention, the prediction (11) comprises the following steps, for at least one given block of the current image or of the reference image: - determination (111) of a plurality of control vectors for the block ; at least one division (112) of the block into sub-blocks; determining (113) a plurality of control vectors for the sub-blocks; determining (114) a prediction value for at least one point of the current image. In addition, the method comprises a step of inserting, in a signal representative of the sequence, information of reconstruction of the control vectors for the given block.

PROCESSES AND DEVICES OF CODING AND DECODING Of a SEQUENCE Of IMAGES REPRESENTEE USING TUBES OF MOVEMENT, PRODUCTS COMPUTER PROGRAM AND CORRESPONDING SIGNAL.

L'invention concerne un procédé de décodage d'un signal représentatif d'une séquence d'images. Selon l'invention, un tel procédé comprend les étapes suivantes : - extraction dudit signal de tubes de mouvement, chacun desdits tubes étant défini par au moins les informations suivantes : - un bloc de pixels de référence comprenant des informations de texture de référence ; - des instants de début de tube et de fin de tube ; - des informations de transition ; - traitement desdites informations de transition ; - combinaison des informations associées aux blocs courants d'au moins deux desdits tubes se chevauchant dans une zone de chevauchement de ladite image courante.

Image encoding method and device implementing an improved prediction, corresponding decoding method and device, signal and computer programs

Techniques are provided for encoding and decoding image data. The techniques implement a prediction of data of a current block based on at least one already encoded block or reference block, wherein said prediction step takes into account a set of encoded blocks adjacent to said current block and including blocks that have not yet been considered according to said writing path order. Encoding includes the steps of: generating a dependence tree associating a current block with at least one reference block from which the predicted block associated with the current block has been predetermined; and inserting information representative of said dependence tree into said set of data associated with each block.

Scalable video image coding method for data transmission system, involves coding quality quantization raising level of layer by prediction from quality quantization level of lower layer different from another quality quantization level

The method involves coding a quality base level (QL0) of a layer from a set of layer by prediction from a quality quantization level (QL1) of a lower layer. Quality quantization raising level of the layer are coded by prediction from another quality quantization level (QL2) of the lower layer different from the former quality quantization level of the lower layer utilized for coding of the quality base level of the layer, for a block from a group of blocks. Independent claims are also included for the following: (1) a device for coding a video scalable image generating a data flow (2) a device for decoding a video scalable image generating a data flow (3) a computer program product comprising a set of instructions for performing a video scalable image coding method.

Data stream decoding method for e.g. set top box, involves assigning data to loads of advance video coding packet and data field when information indicates absence and presence of useful load in scalable video coding packet, respectively

L'invention concerne le décodage d'un flux de données représentatif d'une image ou d'une séquence d'images, présentant une organisation en couches de données, comprenant au moins une première couche, chaque couche comprenant un niveau de base et optionnellement au moins un niveau de rehaussement, lesdites données étant organisées en paquets de données (NALUs). Selon l'invention, le procédé de décodage comprend, pour chaque paquet d'en-tête de type SVC d'un niveau de base, les étapes suivantes : - extraction dans l'en-tête d'une information indiquant la présence d'une charge utile dans ledit paquet d'en-tête de type SVC ; - si ladite information indique une absence de charge utile : affectation des données de scalabilité dudit entête à la charge utile d'un paquet de type AVC précédant ledit paquet de type SVC ; - si ladite information indique une présence d'une charge utile : affectation des données de scalabilité de ladite entête à la charge utile dudit champ de données d'image.

Video scalable image coding method for e.g. data transmission system, involves coding information of block of image at level of layer by direct reference with information of collocated block of reference image at level of layer

Procédé de codage d'une séquence de deux images sous forme de groupes de blocs présentant une structure hiérarchique de couches de données emboîtées de niveaux successifs, le codage d'une des couches de niveau n + 1 étant fait par prédiction à partir de la couche n. Une étape consiste à coder, au niveau de la couche n, une information d'un bloc d'une image de la séquence d'images par référence directe à l'information du bloc co-localisé d'une image de référence. Puis, pour le codage de la couche n + 1, • une étape de détection du codage du bloc par référence directe au niveau de la couche n, puis • une étape de codage, au niveau de la couche n+1, de l'information du bloc de l'image de la séquence d'images par référence directe à l'information du bloc co-localisé de l'image de référence au niveau de la couche n + 1.

PROCESS, DEVICE AND PROGRAMME Of SCHEDULING Of UNITS OF DATA Of a Video stream SCALABLE, AND FINAL CORRESPONDING.

L'invention concerne un procédé d'ordonnancement d'unités (51) de données d'un flux vidéo scalable au moins dans les dimensions temporelle et de quantification, obtenues par un codage hiérarchique, comprenant une étape d'ordonnancement délivrant une liste ordonnée desdites unités de données comprenant, pour un ensemble d'unités de données à ordonner, les étapes suivantes :- introduction dans ladite liste ordonnée des unités de données de la couche de base de quantification ;- association (53), à chaque unité de données d'une couche de raffinement de quantification, d'une information d'efficacité représentative d'un accroissement de qualité et/ou d'un accroissement de débit procurés par ladite unité de données ;- ordonnancement (54) desdites unités de données de couches de raffinement de quantification en fonction desdites informations d'efficacité et d'un critère de présence, indiquant que lesdites unités de données de référence de l'unité de données considérée sont déjà présentes dans ladite liste ordonnée.

ENCODING AND DECODING AN IMAGE OR IMAGE SEQUENCE DIVIDED INTO PIXEL BLOCKS

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

Oversampling method for decoding scalable data stream in data transmission system, involves determining sub pixel position of given pixel from position of reference pixel and from offset representing distance between positions of pixels

The method involves determining the position i.e. sub pixel position, of a pixel of each of the images taken at upper resolution level. The sub pixel position is stored in an oversampling table. Another sub pixel position of a given pixel is determined by the sub pixel position of a reference pixel in lower resolution level of the image and from an offset representing the distance between positions of the given and reference pixels determined by reading the table for the image of the sequence taken at upper resolution level for a given pixel of the image. Independent claims are also included for the following: (1) a device for decoding a data stream representing an image and presenting a data layer organization, comprising an over sampling unit (2) a computer program product comprising program code instructions for implementing a method for decoding data stream (3) an over sampling method for coding an image (4) a device for coding an image, comprising an over sampling unit (5) a computer program product comprising program code instructions for implementing a method for coding an image.

Data flow decoding method for e.g. video on demand service, involves determining capacity to decode each data packets using information representative of scalability class and without reading slice header of data packets

The method involves reading an information representative of a scalability class applied to data packets of a data layer using a reading unit, where the information can be an information representative of a spatial scalability category such as spatial scalability category with determined radio. The information is read in each of a set of signaling packets. A capacity to decode each of the data packets is determined by a determining unit using the information representative of the scalability class and without reading the slice header of the data packets. Independent claims are also included for the following: (1) a device for decoding a data flow representing an image or a video sequence of images (2) a downloadable computer program product comprising a set of instructions for performing a data flow decoding method (3) a method for coding a data flow representing an image or a video sequence of images (4) a device for coding a data flow representing an image or a video sequence of images (5) a downloadable computer program product comprising a set of instructions for performing a data flow coding method (6) a signal representative of a data flow representing an image or video sequence of images (7) an information medium comprising a signal representative of a data flow representing an image or video sequence of images.

DEVICES AND PROCESSES OF CODING AND DECODING ECHELONNABLES OF DATA FLOW Of IMAGES, SIGNAL, COMPUTER PROGRAM AND MODULE Of ADAPTATION OF QUALITY Of IMAGES CORRESPONDENTS

L'invention concerne un procédé de codage d'une image ou d'une séquence d'images, générant un flux de données présentant une structure hiérarchique de couches de données emboîtées de niveaux n successifs, où n est entier, chacun desdits niveaux n correspondant à au moins un des éléments parmi la liste suivante : une résolution prédéterminée desdites images, un pas de quantification desdites images et une fréquence temporelle desdites images, ledit procédé comprenant une étape de codage d'au moins l'une desdites couches, de niveau n+1, par prédiction, au moins à partir de ladite couche de niveau n. Selon l'invention, ce procédé de codage est tel que, pour au moins un bloc d'image de différence de la couche de niveau n+1, ladite étape de codage est effectuée selon un mode de codage par prédiction inter-couche partiel, n'utilisant qu'une partie d'un ensemble de coefficients associés à un bloc d'image de différence de la couche de niveau n servant à ladite prédiction et correspondant audit ...

PROCESS AND DEVICE OF PROGRESSIVE QUANTIFICATION, PROCESS AND DEVICE DEDECODAGE, COMPUTER PROGRAMS, SIGNALS AND SUPPORTS OF DONNEESCORRESPONDANTS

L'invention concerne un procédé itératif de quantification progressive de coefficients, par raffinements de quantification successifs comprenant, après une étape de quantification initiale (31) réalisée sur chacun desdits coefficients avec un pas de quantification prédéterminé et délivrant des données quantifiées, dans lequel un coefficient est dit raffiné lors d'une itération donnée si ladite valeur attribuée lors de ladite étape de raffinement est non nulle, de façon que, pour chaque itération courante, au moins jusqu'à l'avant-dernière itération, et pour chaque coefficient raffiné de ladite itération courante, lors de l'itération suivante :- l'étape de classement affecte audit coefficient le type signifiant (34) ;- les étapes suivantes de détermination d'un résidu et de raffinement ne sont pas mises en oeuvre. The invention relates to an iterative method of progressive quantization of coefficients, by successive quantization refinements comprising, after an initial quantization step (31) performed on each of said coefficients with a predetermined quantization step and delivering quantized data, in which a coefficient is said refined during a given iteration if said value assigned during said refinement step is non-zero, so that for each current iteration, at least until the penultimate iteration, and for each refined coefficient of said current iteration, during the following iteration: the classifying step assigns to said coefficient the type (34), the following stages of determination of a residue and refinement are not implemented.

PROCEEDED OF DECODING COMPLEXITY VARIABLE Of a SIGNAL Of IMAGES, TERMINAL OF DECODING HAS, PROCESS OF CODING, DEVICE OF CODING, SIGNAL AND CORRESPONDING COMPUTER PROGRAMS

L'invention concerne un procédé de décodage d'un signal d'images numérique dans un terminal de décodage, mettant en oeuvre un décodage à complexité variable, permettant, pour au moins une étape du décodage, une sélection d'au moins un outil de décodage, parmi au moins deux outils de décodage disponibles. Le procédé comprend les étapes suivantes : - identification, parmi lesdites images, de premières images, dites images de contrôle, et de secondes images, dites images intermédiaires ; - application, à chacune desdites images de contrôle, pour au moins une étape du décodage, d'au moins un outil de décodage prédéterminé, imposé par ledit signal ; - application, à au moins une desdites images intermédiaires, pour au moins une étape du décodage, d'au moins un outil de décodage sélectionné par ledit terminal de décodage, non imposé par ledit signal.

Method of and device for coding a video image sequence in coefficients of sub-bands of different spatial resolutions

A video image sequence including coefficients of frequency sub-bands with different spatial resolutions is coded. A data stream including at least one restitution level (Niv N2, Niv N1, Niv N) is formed. The restitution levels have coefficients of frequency sub-bands whose spatial resolution equals a spatial resolution of the restitution level. There are inserted, in at least one restitution level, coefficients of frequency sub-bands with a spatial resolution higher than the spatial resolution or resolutions of the restitution level.

PROCESS AND DEVICE OF THICKENING OF FIELD OF MOVEMENT

La présente invention concerne un procédé et un dispositif de densification de champ de mouvement entre une image de destination et une image source à partir d'un champ de mouvement entre l'image source et l'image de destination, dans lequel on détermine des connexions entre les pixels ou sous-pixels (X11, X111, X12, X121) de l'image source et les pixels ou sous-pixels (B, C', E, F) de l'image de destination, on détermine, pour chaque pixel ou sous-pixel de l'image de destination connecté à un pixel ou sous-pixel de l'image source, un espace d'association (Fen) du pixel ou du sous-pixel comprenant au moins un pixel ou sous-pixel de l'image de destination et on associe chaque pixel ou sous-pixel compris dans l'espace d'association (A, A', B, B', C, C') au pixel (X11) de l'image source connecté audit pixel ou sous-pixel pour former un champ de mouvement dense entre l'image de destination et l'image source. The present invention relates to a method and a device for densifying a field of motion between a destination image and a source image from a field of motion between the source image and the destination image, in which connections are determined. between the pixels or sub-pixels (X11, X111, X12, X121) of the source image and the pixels or sub-pixels (B, C ', E, F) of the destination image, it is determined, for each pixel or sub-pixel of the destination image connected to a pixel or sub-pixel of the source image, an association space (Fen) of the pixel or of the sub-pixel comprising at least one pixel or sub-pixel of the destination image and each pixel or sub-pixel included in the association space (A, A ', B, B', C, C ') is associated with the pixel (X11) of the source image connected to said pixel or subpixel to form a dense field of motion between the destination image and the source image.

Encoding and decoding an image or image sequence divided into pixel blocks

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

Method and Device for Coding a Sequence of Video Images

A video image sequence is coded or decoded. By motion compensated temporal filtering, using discrete wavelet decomposition, the discrete wavelet is decomposed by dividing the video image sequence into source and destination groups of images. An image in the destination group is determined from at least one image including pixels in the first group of the source group. The representative image includes pixels and subpixels determined from pixels and subpixels obtained by upsampling at least one image in the source group.

Generation of a video mosaic

A method for generating a first video stream representative of a mosaic of videos, referred to as a video mosaic, from a set of at least two second video streams each consisting of a video associated with header data and encoded video data representative of images. During the course of the method: the encoded video data of the second video streams are stored during the generation of the first video stream, a header associated with said video mosaic is generated, said header being representative of an assembly of the encoded video data from the second video streams, and comprising: first header data which are legacy header data from each of the videos of the set of second video streams, second header data which are generated separately from the header data of the second video streams. Associated computer program, storage media and terminal.

Method and device for coding an image sequence implementing blocks of different size, and decoding method and device

METHOD AND DEVICE FOR DENSIFYING A MOTION FIELD

The invention relates to a method and device for densifying a motion field between a destination image and a source image on basis of a motion field between the source image and the destination image, wherein the inventive method consists in determining connections between the pixels or subpixels (X11, X111, X12, X121) of the source image and the pixels and subpixels (B, C', E, F) of the destination image, in determining, for each pixel or subpixel of the destination image connected to the pixel or subpixel of the source image, a pixel or subpixel association space (Fen) comprising at least one pixel or subpixel of the destination image and in associating each pixel or subpixel contained in said association space (A, A', B, B', C, C') to the pixel (X11) of the source image connected to said pixel or subpixel in such a way that a dense motion field is formed between the destination and source images. © KIPO & WIPO 2007 ...

METHOD AND DEVICE FOR ENCODING A VIDEO A VIDEO IMAGE SEQUENCE

The invention relates to a method and device for encoding a video image sequence by motion-compensated temporal filtering with the aid of a digital wavelet decomposition (110), wherein said digital wavelet decomposition consists in dividing the video image sequence into image groups and in determining (112, 113, 114, 115) the representative image of a group called a destination group on the basis of at least one image composed of pixels of the image group called a source group. Said invention is characterised in that the representative image comprises pixels and sub-pixels which are determined on the basis of pixels and sub-pixels obtainable by sampling (110, 111) of at least one image of the source group. A decoding method and associated decoders are also disclosed. © KIPO & WIPO 2007 ...

Method and device for encoding a video image sequence into frequency subband coefficients of different spatial resolutions

The present invention relates to a method for encoding a video image sequence into sub-wave band coefficients at different spatial resolutions, wherein, at least a data stream (18) composed of at least a recovery level (N-2 level, N-1 level, N level) is formed, and the recovery level comprises some sub-wave band coefficients, at a spatial resolution equal to a spatial resolution of the recovery level; the method is characterized in: for at least a recovery level, some sub-wave band coefficients at a spatial resolution higher than the spatial resolution of the recovery level is inserted into the recovery level. The present invention further relates to a relevant device.

Encoding and decoding an image or image sequence divided into pixel blocks

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

METHOD AND DEVICE FOR DOWNLOADING AUDIOVISUAL CONTENT

A method and a device for downloading an audiovisual content from a data network. A description file describing the sub-dividing of the audiovisual content into a set of segments includes at least two pieces of information representative of respectively two segment download paths, each piece of information representative of a download path being associated with a network interface, and at least two network interfaces being distinct. The downloading device obtains at least one piece of information on distribution of requests for downloading segments by network interface, and for at least one segment of the audiovisual content to be downloaded, it selects a network interface from among the network interfaces associated with the download paths included in the description file, as a function of the information on distribution of requests obtained. A segment download request is then sent via the selected network interface.

MEHTOD AND DEVICE FOR ENCODING A VIDEO IMAGE SEQUENCE INTO FREQUENCY SUBBAND COEFFICIENTS OF DIFFERENT SPATIAL RESOLUTIONS

The invention relates to a method for encoding a video image sequence into frequency subband coefficients of different spatial resolutions consisting in forming at least two data flows (13) consisting of at least one rendering level (Niv N-2, Niv N-1, Niv N) which comprises frequency subband coefficients whose spatial resolution is equal to the rendering level spatial resolution. Said invention is characterised in that the inventive method also consists in inserting frequency subband coefficients of a spatial resolution which is greater than the rendering level spatial resolution(s) into at least one rendering level. © KIPO & WIPO 2007 ...

Method and device for encoding images using improved prediction, and corresponding decoding method and device, signal and computer software

The invention relates to a technique for encoding image data, and to a corresponding decoding technique. The invention comprises implementing a prediction of data of a current block (2) based on at least one already encoded block (1, 6) or reference block, wherein said prediction step takes into account a set of encoded blocks adjacent to said current block and including blocks that have not yet been considered according to said writing path order. The encoding includes the steps of: generating a dependence tree associating a current block with at least one reference block from which the predicted block associated with the current block has been predetermined; and inserting information representative of said dependence tree into said set of data associated with each block.

Method And Device For Densifying A Motion Field

A motion field between a destination image and a source image is densified on the basis of the motion field between the source image and the destination image. Connections between the source image pixels or subpixels (X 11 , X 111 , X 12 , X 121 ) and the destination image pixels or subpixels (B, C', E, F) are determined. For each pixel or subpixel of the destination image connected to a pixel or subpixel of the source image, a pixel or subpixel association space (Fen) including one pixel or subpixel of the destination image is determined. Each pixel or subpixel in the association space (A, A', B, B', C, C') is associated with the source image pixel (X 11 ) connected to the pixel or subpixel to form a dense motion field between the destination and source images.

Method and devices for coding and decoding an image sequence represented with the aid of motion tubes, corresponding computer program products and signal

The invention relates to a method of decoding a signal representative of an image sequence. According to the invention, such a method comprises the following steps: extraction from said signal of motion tubes, each of said tubes being defined by at least the following information: a block of reference pixels comprising reference texture information; start of tube and end of tube instants; transition information; - processing of said transition information; combining of the information associated with the current blocks of at least two of said tubes overlapping in a zone of overlap of said current image.

ENCODING AND DECODING AN IMAGE OR IMAGE SEQUENCE DIVIDED INTO PIXEL BLOCKS

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

METHOD FOR THE VARIABLE-COMPLEXITY DECODING OF AN IMAGE SIGNAL, CORRESPONDING DECODING TERMINAL, ENCODING METHOD, ENCODING DEVICE, COMPUTER SIGNAL AND PROGRAMS

A method is provided decoding a digital image signal in a decoding terminal that uses a variable-complexity decoding, enabling, for at least one step in the decoding, selection of at least one decoding tool from at least two available decoding tools. The method includes the following steps: identifying from the images control images and intermediate images; applying to each of the control images, for at least one step of the decoding, at least one predetermined decoding tool imposed by the signal; applying to at least one of the intermediate images, for at least one step of the decoding, at least one decoding tool selected by the decoding terminal and not imposed by the signal.

METHODS AND DEVICES FOR CODING AND DECODING AN IMAGE SEQUENCE REPRESENTED WITH THE AID OF MOTION TUBES, CORRESPONDING COMPUTER PROGRAM PRODUCTS AND SIGNAL

A method and apparatus are provided for decoding a signal representative of an image sequence. The method includes extracting motion tubes from the signal, each of the tubes being defined by at least the following information cues: a block of reference pixels comprising reference texture information cues; start-of-tube and end-of-tube instants; and transition information cues. The method further includes processing the transition information cues and combining the information cues associated with the current blocks of at least two of the tubes overlapping in an overlap zone of the current image.

Encoding and decoding an image or image sequence divided into pixel blocks

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

Methods and devices for coding and decoding an image sequence represented with the aid of motion tubes, corresponding computer program products and signal

A method and apparatus are provided for decoding a signal representative of an image sequence. The method includes extracting motion tubes from the signal, each of the tubes being defined by at least the following information cues: a block of reference pixels comprising reference texture information cues; start-of-tube and end-of-tube instants; and transition information cues. The method further includes processing the transition information cues and combining the information cues associated with the current blocks of at least two of the tubes overlapping in an overlap zone of the current image.

Inheritance of universal resource identifier (URI) parameters

A method is provided for accessing a multimedia content containing at least one data segment. This data segment is accessible via a document describing the content. The method includes a first step of obtaining the document describing the content, from which document at least a first universal address of a segment is generated; a second step of obtaining at least one parameter associated with the universal address of the document describing the content; a step of reading at least one address generator rule in the document describing the content; and as a function of the address generator rule, of the first universal address of the segment, and of the parameter that has been obtained, a last step of generating the second universal address for the segment. Also provided is a method of generating a document that is suitable for use in the context of the access method.

Method for the variable-complexity decoding of an image signal, corresponding decoding terminal, encoding method, encoding device, computer signal and programs

A method is provided decoding a digital image signal in a decoding terminal that uses a variable-complexity decoding, enabling, for at least one step in the decoding, selection of at least one decoding tool from at least two available decoding tools. The method includes the following steps: identifying from the images control images and intermediate images; applying to each of the control images, for at least one step of the decoding, at least one predetermined decoding tool imposed by the signal; applying to at least one of the intermediate images, for at least one step of the decoding, at least one decoding tool selected by the decoding terminal and not imposed by the signal.

METHOD OF PROCESSING AN ERROR DURING THE RENDERING OF A DIGITAL CONTENT

A method is provided for processing an error during restitution of digital content during a multimedia session on a terminal. The session offers a plurality of representations of the digital content which are described in a medium carrying information describing the multimedia session and transmitted independently of the representation data. The method includes, following the obtaining of the description-carrying medium, acts of obtaining, for at least one representation indicated in the description information-carrying medium, at least one item of information regarding guarantee of availability of the data of the representation on a server; of comparing the information regarding guarantee of availability of the data of the representation on the server with at least one predetermined value; of selecting a fallback representation as a function of the result of the comparison, and upon detecting a restitution error, of toggling to the fallback representation selected. 1. A method for processing an error in the course of the rendering of a digital content during a multimedia session on a terminal , said session offering a plurality of representations of said digital content described in a descriptive information medium for the multimedia session transmitted independently of the representation data , wherein the method comprises the following acts performed after obtaining the descriptive medium:for at least one representation indicated in the descriptive information medium, obtaining at least one item of information regarding guarantee of availability of the data of the representation on a server,comparing the information regarding guarantee of availability of the data of the representation on the server with at least one predetermined value,selecting a fallback representation according to a result of the comparison, andon detection of a rendering error, switching to the selected fallback representation.2. The method as claimed in claim 1 , wherein the fallback ...

IMAGE ENCODING METHOD AND DEVICE IMPLEMENTING AN IMPROVED PREDICTION, CORRESPONDING DECODING METHOD AND DEVICE, SIGNAL AND COMPUTER PROGRAMS

Techniques are provided for encoding and decoding image data. The techniques implement a prediction of data of a current block based on at least one already encoded block or reference block, wherein said prediction step takes into account a set of encoded blocks adjacent to said current block and including blocks that have not yet been considered according to said writing path order. Encoding includes the steps of: generating a dependence tree associating a current block with at least one reference block from which the predicted block associated with the current block has been predetermined; and inserting information representative of said dependence tree into said set of data associated with each block.

Method and device for coding an image sequence implementing blocks of different size, signal, data medium, decoding method and device, and computer programs corresponding thereto

A method is provided for coding an image sequence, including splitting a current image into blocks of standard size, termed macroblocks. For at least one current macroblock of the current image, the method further includes: constructing at least one block of greater size than the current macroblock, termed a large block, which includes the current macroblock and at least one neighbor macroblock in the current image, taking account of characteristics of the current image; coding the large block, delivering base coding information, making it possible to reconstruct a base layer of said current image, and for at least one large block, determining enhancement information associated with at least one macroblock present in the large block.

Device and method for scalable encoding and decoding of image data flow and corresponding signal and computer program

A method of coding an image or a sequence of images generating a flow of data in the form of groups of blocks, at least one group of blocks containing image blocks having a resolution and a quality level of identical quantification, the method including the following steps for the at least one group of blocks, of a) a first coding so that each block of the at least one group of blocks has at least one associated parameter that is given a first value, and b) a second coding for giving the associated parameter for at least one block of the at least one group of blocks a second value, so that for the at least one block, the first and second values given for the parameter can be combined during decoding to provide a value assigned to the parameter.

Inheritance of uniform resource identifier (URI) parameters

The invention concerns a method for accessing an item of multimedia content (y) containing at least one data segment (0.mp4v, 180180.mp4v). This data segment can be accessed via a document describing the content (y.mpd). The method comprises a first step (E1, E11) of obtaining the document describing the content (y.mpd) from which at least a first universal address (HTTP://x.com/video/0.mp4v) of a segment is generated; a second step of obtaining at least one parameter (s=abd) associated with the universal address (HTTP://x.com/y.mpd s=abd) of the document describing the content (y.mpd); a step of reading at least one address generation rule (URLParameter Template) in the document describing the content (y.mpd); and, on the basis of the address generation rule (URLParameter Template), the first universal address of the segment (HTTP://x.com/video/0.mp4v) and the parameter that is obtained (s=abd), a final step (E3) of generating the second universal address of the segment (HTTP://x.com/video ...

Method and device for encoding a sequence of images implementing a temporal prediction, corresponding signal, data storage medium, method and decoding device and computer program products

A method and apparatus are provided for coding a sequence of images. The method includes a step of coding at least one block of a current image of the sequence, implementing a prediction associating the block with at least one corresponding block in a reference image. The prediction includes the following steps, for at least one given block of the current image or of the reference image: determination of a plurality of control vectors for the block; at least one splitting of the block into sub-blocks; determination of a plurality of control vectors for the sub-blocks; and determination of a prediction value for at least one point of the current image. Moreover, the method includes a step of inserting, into a signal representative of the sequence, information regarding reconstruction of the control vectors for the given block.

METHOD AND DEVICE FOR CODING AN IMAGE SEQUENCE IMPLEMENTING BLOCKS OF DIFFERENT SIZE, SIGNAL, DATA MEDIUM, DECODING METHOD AND DEVICE, AND COMPUTER PROGRAMS CORRESPONDING THERETO

A method is provided for coding an image sequence, including splitting a current image into blocks of standard size, termed macroblocks. For at least one current macroblock of the current image, the method further includes: constructing at least one block of greater size than the current macroblock, termed a large block, which includes the current macroblock and at least one neighbor macroblock in the current image, taking account of characteristics of the current image; coding the large block, delivering base coding information, making it possible to reconstruct a base layer of said current image, and for at least one large block, determining enhancement information associated with at least one macroblock present in the large block.

Method and device for coding a sequence of images implementing a time prediction, corresponding signal, data medium, decoding method and device and computer program products

The invention relates to a method of coding a sequence of images, comprising a step of coding at least one block of a current image of the sequence, implementing a prediction (11) associating the block with at least one corresponding block in a reference image. According to the invention, the prediction (11) comprises the following steps, for at least one given block of the current image or of the reference image: determination (111) of a plurality of control vectors for the block; at least one splitting (112) of the block into sub-blocks; determination (113) of a plurality of control vectors for the sub-blocks; determination (114) of a prediction value for at least one point of the current image. Moreover, the method comprises a step of inserting, into a signal representative of the sequence, information regarding reconstruction of the control vectors for the given block.

Method and device for coding an image sequence implementing blocks of different size, signal, data medium, decoding method and device, and computer programs corresponding thereto

The invention relates to a method of coding an image sequence, comprising a step of splitting (11) a current image into blocks of standard size, termed macroblocks. According to the invention, the method comprises, for at least one current macroblock of said current image, the following steps: - construction (12) of at least one block of greater size than said current macroblock, termed a large block, comprising said current macroblock and at least one neighbour macroblock in said current image, taking account of characteristics of said current image; - coding (13) of said large block, delivering base coding information, making it possible to reconstruct a base layer of said current image, and for at least one large block, determination (14) of enhancement information associated with at least one macroblock present in said large block.

Encoding and decoding of an image or image sequence divided into pixel blocks

The invention relates to a method for encoding an image or image sequence generating a data flow including data representative of pixel groups, or blocks, in one of said images (IE). The method comprises the steps of: grouping (C1) the blocks in a block cluster based on the proximity of their respective values corresponding to at least one parameter of a block to be encoded; determining (C2) a value of said parameter, said value being characteristic of said block cluster; encoding (C3) blocks of said cluster, wherein the values of said blocks for said parameter are implicitly encoded by inheritance of said characteristic value, or are encoded as refinements relative to said characteristic value, and encoding a data structure associated with said block cluster, said data structure including a piece of data associated with said characteristic value.

ENCODING AND DECODING AN IMAGE OR IMAGE SEQUENCE DIVIDED INTO PIXEL BLOCKS

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value. 111-. (canceled)12. A coding method comprising:coding, by a coding device, at least one image of a sequence of images, including grouping pixels of the at least one image into a plurality of blocks and generating a data stream that includes data representative of said blocks, wherein coding comprises:grouping at least some of the plurality of blocks in a cluster of blocks according to proximity of their respective values of movement parameter to be coded;determining a movement value characteristic of said cluster of blocks as a function of a respective value of at least one movement parameter to be coded of at least one block of said cluster of blocks;coding each of the blocks of said cluster, where the values of movement parameter of said blocks are coded implicitly by inheritance of said characteristic value or are coded as refinements relative to said characteristic value; andcoding a data structure associated with said cluster of blocks, said data structure including data associated with said characteristic value.13. The coding method according to claim 12 , wherein the movement parameter to be coded of at least one block corresponds to the movement vector of ...

ENCODING AND DECODING AN IMAGE OR IMAGE SEQUENCE DIVIDED INTO PIXEL BLOCKS

A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value. 11. A method of coding an image or a sequence of images generating a data stream (F) that include data representative of pixel groups , referred to as blocks , in one of said images (IE) , the method including the steps of:{'b': 1', '1, 'grouping (C) blocks in a cluster (G) of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; and'}{'b': 2', '1, 'determining (C) a value of said parameter, said value being characteristic of said group (G) of blocks;'}the method being characterized in that it includes the step of:{'b': 3', '1', '1, 'coding (C) blocks of said cluster (G), where the values of said blocks for said parameter are coded implicitly by inheritance of said characteristic value or are coded as refinements relative to said characteristic value, and coding a data structure associated with said cluster (G) of blocks, said data structure including data associated with said characteristic value.'}211-. (canceled) The present invention relates generally to the field of image processing and more precisely to coding and decoding digital images and sequences of digital images.Digital images and ...

INHERITANCE OF UNIVERSAL RESOURCE IDENTIFIER (URI) PARAMETERS

A method is provided for accessing a multimedia content containing at least one data segment. This data segment is accessible via a document describing the content. The method includes a first step of obtaining the document describing the content, from which document at least a first universal address of a segment is generated; a second step of obtaining at least one parameter associated with the universal address of the document describing the content; a step of reading at least one address generator rule in the document describing the content; and as a function of the address generator rule, of the first universal address of the segment, and of the parameter that has been obtained, a last step of generating the second universal address for the segment. Also provided is a method of generating a document that is suitable for use in the context of the access method. 1. A method comprising:generating a document describing a multimedia content containing at least one data segment that is accessible via a first universal address from said document, wherein generating comprises: the first universal address; and', 'at least one parameter associated with the universal address of the document describing the content., 'at least one step of writing at least one universal address generator rule in the document, said generator rule being suitable for generating a second universal address for the segment from both2. The method according to claim 1 , wherein the universal address generator rule specifies the parameters obtained that need to be taken into account in order to generate the second universal address for the segment.3. The method according to claim 1 , wherein the address generator rule indicates an order in which parameters that have been obtained need to be taken into account in order to generate the second universal address for the segment.4. A method comprising: obtaining the document describing the content, from which document at least a first universal address of ...

Generation of a video mosaic

A method for generating a first video stream representative of a mosaic of videos, referred to as a video mosaic, from a set of at least two second video streams each consisting of a video associated with header data and encoded video data representative of images. During the course of the method: the encoded video data of the second video streams are stored during the generation of the first video stream, a header associated with said video mosaic is generated, said header being representative of an assembly of the encoded video data from the second video streams, and comprising: first header data which are legacy header data from each of the videos of the set of second video streams, second header data which are generated separately from the header data of the second video streams. Associated computer program, storage media and terminal.

HERITAGE OF UNIVERSAL RESOURCE IDENTIFIER PARAMETERS (URI)

L'invention concerne un procédé d'accès à un contenu multimédia (y) contenant au moins un segment de données (0.mp4v, 180180.mp4v). Ce segment de données est accessible via un document décrivant le contenu (y.mpd). Le procédé comporte une première étape d'obtention (E1, E11) du document décrivant le contenu (y.mpd) à partir duquel est générée (E2) au moins une première adresse universelle (HTTP://x.com/video/0.mp4v d'un segment ; une seconde étape d'obtention d'au moins un paramètre (s=abd) associé à l'adresse universelle (HTTP://x.com/y.mpd?s=abd du document décrivant le contenu (y.mpd) ; une étape de lecture d'au moins une règle de génération d'adresse (URLParameterTemplate) dans le document décrivant le contenu (y.mpd) ; et en fonction de la règle de génération d'adresse (URLParameterTemplate), de la première adresse universelle du segment (HTTP://x.com/video/0.mp4v et du paramètre obtenu (s=abd), une dernière étape de génération (E3) de la deuxième adresse universelle du segment (HTTP://x.com/video/y1.mp4v?s=abd) L'invention concerne aussi un procédé de génération d'un document (y.mpd) qui peut être utilisé dans le contexte du procédé d'accès. The invention relates to a method for accessing multimedia content (y) containing at least one data segment (0.mp4v, 180180.mp4v). This segment of data is accessible via a document describing the content (y.mpd). The method comprises a first step of obtaining (E1, E11) the document describing the content (y.mpd) from which is generated (E2) at least one first universal address (HTTP://x.com/video/0 .mp4v of a segment, a second step of obtaining at least one parameter (s = abd) associated with the universal address (HTTP://x.com/y.mpd?s=abd of the document describing the content (y.mpd); a step of reading at least one address generation rule (URLParameterTemplate) in the document describing the content (y.mpd); and according to the address generation rule ( ...

METHOD AND DEVICE FOR DOWNLOADING AUDIOVISUAL CONTENT

L invention concerne un procédé et un dispositif de téléchargement d un contenu audiovisuel depuis un réseau de données. Selon l invention, un fichier de description décrivant le découpage du contenu audiovisuel en un ensemble de segments, comprend au moins deux informations représentatives respectivement de deux chemins de téléchargement des segments, chaque information représentative d un chemin de téléchargement étant associée à une interface réseau, et au moins deux interfaces réseau étant distinctes. Le dispositif de téléchargement obtient (22, 26) au moins une information de répartition de requêtes de téléchargement des segments par interface réseau, et pour au moins un segment du contenu audiovisuel à télécharger, il sélectionne (23) une interface réseau parmi les interfaces réseau associées aux chemins de téléchargement comprises dans le fichier de description, en fonction de l information de répartition de requêtes obtenue. Une requête de téléchargement du segment est ensuite envoyée (24) via l interface réseau sélectionnée. The invention relates to a method and a device for downloading audiovisual content from a data network. According to the invention, a description file describing the division of the audiovisual content into a set of segments, comprises at least two pieces of information respectively representative of two segments download paths, each piece of information representative of a download path being associated with a network interface, and at least two network interfaces being distinct. The downloading device obtains (22, 26) at least one segment download request distribution information by network interface, and for at least one segment of the audiovisual content to be downloaded, it selects (23) a network interface among the network interfaces associated with the download paths included in the description file, based on the query distribution information obtained. A request to download the segment is then sent (24) via the selected network ...

multimedia document generation process, multimedia content server, and terminal for accessing multimedia content

resumo patente de invenção: "herança de parâmetros de identificador universal de fonte (uri > iuf)". a presente invenção se refere a um processo de acesso a um conteúdo multimídia (y), contendo pelo menos um segmento de dados (0.mp4v, 180180.mp4v). esse segmento de dados é acessível via um documento que descreve o conteúdo (y.mpd). o processo comporta uma primeira etapa de obtenção (e1, e11) do documento que descreve o conteúdo (y.mpd) a partir do qual é gerado (e2) pelo menos um primeiro endereço universal (http://x.com/vídeo/0.mp4v) de um segmento, uma segunda etapa de obtenção de pelo menos um parâmetro (s=abd) associado ao endereço universal (http://x.com/y.mpd?s=abd) do documento que descreve o conteúdo (y.mpd); uma etapa de leitura de pelo menos uma regra de geração de endereço (urlparameter template) no documento que descreve o conteúdo (y.mpd); e em função da regra de geração de endereço (urlparameter template), do primeiro endereço universal do segmento (http://x.-com/video/0.mp4v) e do parâmetro obtido (s=abd), uma última etapa de geração (e3) do segundo endereço universal do segmento (http://x.com/video/yl.mp4v?s=abd). a invenção se refere também a um processo de geração de um documento (y.mpd) que pode ser utilizado no contexto do processo de acesso. abstract patent: "inheritance of universal source identifier (uri> iuf) parameters". The present invention relates to a process for accessing multimedia content (y) containing at least one data segment (0.mp4v, 180180.mp4v). This data segment is accessible via a document describing the content (y.mpd). The process comprises a first step of obtaining (e1, e11) from the document describing the content (y.mpd) from which at least one first universal address (http://x.com/video/) is generated. 0.mp4v) of a segment, a second step in obtaining at least one parameter (s = abd) associated with the universal address (http://x.com/y.mpd?s=abd) of the document describing the content (y.mpd); a ...

Method, device and programme for ordering data units of a scalable video data stream and corresponding terminal

L'invention concerne un procédé d'ordonnancement d'unités (51) de données d'un flux vidéo scalable au moins dans les dimensions temporelle et de quantification, obtenues par un codage hiérarchique, comprenant une étape d'ordonnancement délivrant une liste ordonnée desdites unités de données comprenant, pour un ensemble d'unités de données à ordonner, les étapes suivantes : - introduction dans ladite liste ordonnée des unités de données de la couche de base de quantification ; association (53), à chaque unité de données d'une couche de raffinement de quantification, d'une information d'efficacité représentative d'un accroissement de qualité et/ou d'un accroissement de débit procurés par ladite unité de données ; - ordonnancement (54) desdites unités de données de couches de raffinement de quantification en fonction desdites informations d'efficacité et d'un critère de présence, indiquant que lesdites unités de données de référence de l'unité de données considérée sont déjà présentes dans ladite liste ordonnée.

Method of processing the restitution error in respect of a digital content

The invention relates to a method of processing an error in the course of the restitution of a digital content during a multimedia session on a terminal, said session offering a plurality of representations of said digital content which are described in a medium carrying information describing the multimedia session and transmitted independently of the representation data, the method being characterized in that it comprises, following the obtaining of the description-carrying medium, steps of obtaining (208), for at least one representation indicated in the description information-carrying medium, at least one item of information regarding guarantee of availability of the data of the representation on a server; of comparing (209) the information regarding guarantee of availability of the data of the representation on the server with at least one predetermined value; of selecting (210) a fallback representation as a function of the result of the comparison, and upon detecting a restitution error, of toggling (213) to the fallback representation selected.

Encoding and decoding of an image or image sequence divided into pixel blocks

The invention relates to a method for encoding an image or image sequence generating a data flow including data representative of pixel groups, or blocks, in one of said images (IE). The method comprises the steps of: grouping (C1) the blocks in a block cluster based on the proximity of their respective values corresponding to at least one parameter of a block to be encoded; determining (C2) a value of said parameter, said value being characteristic of said block cluster; encoding (C3) blocks of said cluster, wherein the values of said blocks for said parameter are implicitly encoded by inheritance of said characteristic value, or are encoded as refinements relative to said characteristic value, and encoding a data structure associated with said block cluster, said data structure including a piece of data associated with said characteristic value.

Method of processing the restitution error in respect of a digital content

Method and device for carrying out a progressive quantization

The invention relates to an iterative method for carrying out a progressive quantization of coefficients by conducting successive quantization refinements after an initial quantization step performed on each of these coefficients with a predetermined quantization step and furnishing quantized data, in which a coefficient is called refined during a given iteration if this value attributed during the refining step is not zero in such a manner that, for each ongoing iteration, at least up to the next to last iteration, and for each refined coefficient of this ongoing iteration, during the following iteration: the ranking step assigns, to the coefficient, the significant type, and; the following steps of determining a residual and of refining are not carried out.

Inheritance of uniform resource identifier (uri) parameters

Method of and Device for Coding a Video Image Sequence in Coefficients of Sub-Bands of Different Spatial Resolutions

A video image sequence including coefficients of frequency sub-bands with different spatial resolutions is coded. A data stream including at least one restitution level (Niv N−2, Niv N−1, Niv N) is formed. The restitution levels have coefficients of frequency sub-bands whose spatial resolution equals a spatial resolution of the restitution level. There are inserted, in at least one restitution level, coefficients of frequency sub-bands with a spatial resolution higher than the spatial resolution or resolutions of the restitution level.

Génération d'une mosaïque de vidéos

Procédé de génération d'un premier flux vidéo (FV1) représentatif d'une mosaïque de vidéos (MV), dit vidéo mosaïque, à partir d'un ensemble d'au moins deux deuxièmes flux vidéo (FV2) composés chacun d'une vidéo associée à des données d'en-tête et à des données vidéo encodées représentatives d'images. Au cours du procédé : - les données vidéo encodées des deuxièmes flux vidéo (FV2) sont conservées lors de la génération du premier flux vidéo (FV1), - un en-tête associé à ladite vidéo mosaïque (MV) est généré, ledit en-tête étant représentatif d'un assemblage des données vidéos encodées des deuxièmes flux vidéo (FV2), et comprenant : - des premières données d'en-tête qui sont héritées des données d'en-tête de chacune des vidéos de l'ensemble des deuxièmes flux vidéo, - des deuxièmes données d'en-tête qui sont générées indépendamment des données d'en-tête des deuxièmes flux vidéo (FV2). Programme informatique, support de stockage et terminal associés.

Génération d'une mosaïque de vidéos

Procédé de génération d'un premier flux vidéo (FV1) représentatif d'une mosaïque de vidéos (MV), dit vidéo mosaïque, à partir d'un ensemble d'au moins deux deuxièmes flux vidéo (FV2) composés chacun d'une vidéo associée à des données d'en-tête et à des données vidéo encodées représentatives d'images. Au cours du procédé : - les données vidéo encodées des deuxièmes flux vidéo (FV2) sont conservées lors de la génération du premier flux vidéo (FV1), - un en-tête associé à ladite vidéo mosaïque (MV) est généré, ledit en-tête étant représentatif d'un assemblage des données vidéos encodées des deuxièmes flux vidéo (FV2), et comprenant : - des premières données d'en-tête qui sont héritées des données d'en-tête de chacune des vidéos de l'ensemble des deuxièmes flux vidéo, - des deuxièmes données d'en-tête qui sont générées indépendamment des données d'en-tête des deuxièmes flux vidéo (FV2). Programme informatique, support de stockage et terminal associés.

Procédé et dispositif de téléchargement de contenu audiovisuel

Method of processing an error during the rendering of a digital content

A method is provided for processing an error during restitution of digital content during a multimedia session on a terminal. The session offers a plurality of representations of the digital content which are described in a medium carrying information describing the multimedia session and transmitted independently of the representation data. The method includes, following the obtaining of the description-carrying medium, acts of obtaining, for at least one representation indicated in the description information-carrying medium, at least one item of information regarding guarantee of availability of the data of the representation on a server; of comparing the information regarding guarantee of availability of the data of the representation on the server with at least one predetermined value; of selecting a fallback representation as a function of the result of the comparison, and upon detecting a restitution error, of toggling to the fallback representation selected.

Procedimiento de decodificación de complejidad variable de una señal de imágenes, terminal de decodificación, procedimiento de codificación, dispositivo de codificación, señal y programas de ordenador correspondientes

Procedimiento de decodificación de una señal digital de imágenes en un terminal de decodificación, que implementa una decodificación de complejidad variable, permitiendo, para al menos una etapa de decodificación, una selección de al menos una herramienta de decodificación, entre al menos dos herramientas de decodificación disponibles, que comprende las etapas siguientes: - lectura, en dicha señal, de al menos una primera información de un tipo I, P o B de las imágenes de dicha señal; - lectura, en dicha señal, de al menos una segunda información de identificación entre dichas imágenes, de unas primeras imágenes, denominadas imágenes de control, señalizando dicha segunda información de identificación explícitamente que una imagen de referencia de tipo I, P o B que sirve para la predicción de otras imágenes es degradable o no; - a partir de dicha segunda información de identificación, identificación, entre dichas imágenes, de dichas imágenes de control correspondientes a las imágenes no degradables, y de unas segundas imágenes, denominadas imágenes intermedias que corresponden a las imágenes degradables; - aplicación, a cada una de dichas imágenes de control, para al menos una etapa de decodificación, de al menos una herramienta de decodificación predeterminada, impuesta por dicha señal; - aplicación, a al menos una de dichas imágenes intermedias, para al menos una etapa de decodificación, de al menos una herramienta de decodificación seleccionada por dicho terminal de decodificación, y no impuesta por dicha señal.

Procedes et dispositifs de codage et de decodage d'une sequence d'images representee a l'aide de tubes de mouvement, produits programme d'ordinateur et signal correspondants

L'invention concerne un procédé de décodage d'un signal représentatif d'une séquence d'images. Selon l'invention, un tel procédé comprend les étapes suivantes : extraction dudit signal de tubes de mouvement, chacun desdits tubes étant défini par au moins les informations suivantes : un bloc de pixels de référence comprenant des informations de texture de référence; des instants de début de tube et de fin de tube; des informations de transition; - traitement desdites informations de transition; combinaison des informations associées aux blocs courants d'au moins deux desdits tubes se chevauchant dans une zone de chevauchement de ladite image courante.

Procedimientos y dispositivos de codificación y de decodificación de una secuencia de imágenes representada por medio de tubos de movimiento, paquetes de software de ordenador y señal correspondientes

Procedimiento de decodificación de una señal representativa de una secuencia de imágenes, que se caracteriza porque comprende las siguientes etapas: extracción (31) de dicha señal de unos tubos de movimiento, comprendiendo un tubo un bloque de píxeles que pueden evolucionar de forma independiente de al menos otro tubo; dos tubos pudiendo, en un instante dado, asignar unos valores diferentes a un mismo píxel de una de dichas imágenes, estando definido cada uno de dichos tubos mediante al menos las siguientes informaciones: - un bloque de píxeles de referencia que comprende unas informaciones de textura de referencia; - unos instantes de inicio de tubo y de fin de tubo; - unas informaciones de transición, que permiten actualizar dicho bloque de referencia en al menos un instante t de dicha secuencia; tratamiento (32) de dichas informaciones de transición, que emiten un bloque actual para cada uno de dichos tubos en una imagen actual en un instante t; combinación (33) de las informaciones asociadas a los bloques actuales de al menos dos de dichos tubos que se solapan en una zona de solapamiento de dicha imagen actual, de tal modo que se reconstruyan unos píxeles optimizados en dicha zona de solapamiento.

Procedes et dispositifs de codage et de decodage d'une sequence d'images representee a l'aide de tubes de mouvement, produits programme d'ordinateur et signal correspondants

L'invention concerne un procédé de décodage d'un signal représentatif d'une séquence d'images. Selon l'invention, un tel procédé comprend les étapes suivantes : extraction dudit signal de tubes de mouvement, chacun desdits tubes étant défini par au moins les informations suivantes : un bloc de pixels de référence comprenant des informations de texture de référence; des instants de début de tube et de fin de tube; des informations de transition; - traitement desdites informations de transition; combinaison des informations associées aux blocs courants d'au moins deux desdits tubes se chevauchant dans une zone de chevauchement de ladite image courante.