Patent application number | Description | Published |
20090219988 | METHODS OF ENCODING AND DECODING AN IMAGE OR A SEQUENCE OF IMAGES, CORRESPONDING DEVICES, COMPUTER PROGRAM AND SIGNAL - A method is provided of coding an image or a sequence of images, generating a data stream, each image being split into at least two images blocks, wherein each of which is associated a transformed block comprising a set of coefficients. The coefficients of a transformed block are distributed into group(s) of coefficients according to a predetermined path for reading the transformed blocks. The method includes, for each of the transformed blocks: a step of coding a series of coefficients corresponding to at least one group of coefficients, the series being determined on the basis of a type of series of coefficients that is selected from at least two possible types, and a step of inserting into the data stream a cue representative of the type of series of coefficients that is selected for the image or the sequence of images, or for a portion of the image. | 09-03-2009 |
20100150224 | METHOD AND DEVICE FOR CODING DATA IN A SCALABLE STREAM - The invention relates to a method of and a device for coding data in a scalable stream organized in units, characterized in that an indication is given in the header of an SVC NAL unit as to whether this NAL unit can be truncated or not in an adaptation operation for the scalable stream concerned | 06-17-2010 |
20100189172 | 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. | 07-29-2010 |
20100278444 | 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. | 11-04-2010 |
20100322529 | Device And Method For Scalable Encoding And Decoding Of Image Data Flow And Corresponding Signal And Computer Program - 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, characterized in that said method comprises at least 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 said associated parameter for at least one block of said at least one group of blocks a second value, so that for said at least one bloc, the first and second values given for said parameter can be combined during decoding in order to provide a value assigned to said parameter. | 12-23-2010 |
20110007977 | 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. | 01-13-2011 |
20110103487 | 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. | 05-05-2011 |
20110188768 | 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. | 08-04-2011 |
20110255601 | PREDICTION OF AN IMAGE BY COMPENSATION DURING FORWARD MOVEMENT - A method is provided for predicting an image by compensation during forward movement from at least one reference image. For at least one block of a reference image, referred to as a reference block, the prediction method includes the following steps: determining at least one piece of movement information, representing a movement between said reference block and a matching block in the image to be predicted; determining at least one enlarged block, including the reference block and at least one point of a block adjacent to said reference block in the reference image; and determining a prediction value for at least one point of the image to be predicted from the at least one enlarged block and from the movement information determined for the reference block. | 10-20-2011 |
20110261888 | 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. | 10-27-2011 |
20110286521 | METHOD AND DEVICE FOR ENCODING AN IMAGE USING A PREDICTION MASK DECODING METHOD AND DEVICE AND CORRESPONDING SIGNALS AND COMPUTER PROGRAMS - A method is provided for encoding at least one image, divided into macroblocks, one macroblock including a set of blocks de pixels. The method includes, for at least one current macroblock of a current image, at least two iterations of the following steps: allocation of a priority level for encoding to at least one pixel of the current macroblock, selection of a pixel with the highest priority level called the priority pixel, prediction of a set of pixels including the priority pixel and a step of encoding a remainder from prediction for a region made up of predicted pixels of the macroblock, called the predicted region, the encoding step being used as and when the predicted region meets a predetermined encoding criterion. | 11-24-2011 |
20120106646 | METHOD FOR ENCODING AND DECODING IMAGES, ENCODING AND DECODING DEVICES, CORRESPONDING DATA STREAMS AND COMPUTER PROGRAM - A method and apparatus are provided for encoding an image sequence. The method includes the following steps, for at least one group of blocks of an image: determining, for each block, at least one parameter characteristic of said block; forming at least one cluster including the blocks having at least one similar characteristic parameter; encoding the blocks of said cluster, the similar characteristic parameter(s) associated with said cluster being encoded only once; encoding the blocks that do not belong to any cluster, the characteristic parameter(s) associated with each of said blocks not being encoded; generating a data stream; and inserting into said stream, at least one piece of information on the partitioning of the group(s), in order to identify the outer block(s) within a group. | 05-03-2012 |
20120183070 | METHOD OF CODING AND DECODING IMAGES, CORRESPONDING DEVICE FOR CODING AND DECODING AND COMPUTER PROGRAM - A method and apparatus are provided for coding a signal from images, the images being split into sub-blocks of pixels. The method includes grouping at least two sub-blocks into at least one block of larger size, when the sub-blocks comply with at least one predetermined grouping criterion. A prediction is performed by applying at least one mode of motion prediction using at least two distinct motion prediction vectors, for at least one block of larger size, the motion prediction vectors being associated respectively with sub-sets of the block of larger size, comprising at least one of the sub-blocks of the block of larger size. The sub-sets are predefined and distinct. | 07-19-2012 |
20120219066 | DATA SUBSTREAM ENCAPSULATION METHOD, DE-ENCAPSULATION METHOD, AND CORRESPONDING COMPUTER PROGRAMS - A method and apparatus are provided for encapsulating a plurality of data substreams encoded in a bit stream, wherein the encoded data substream is obtained by entropy encoding of a symbol subsequence representing an image or a series of images. The method includes grouping data substreams into substream pairs according to an iterative traversal order predetermined from the plurality of substreams, and on the basis of a pair of the substreams, obtaining a symmetrical pair by reversing a data order making up the second substream of the pair. The obtained pairs are then concatenated within a sequence. The binary stream is created by encapsulating the sequence and information related to a number of substreams and related to the sizes of pairs of symmetrical substreams. | 08-30-2012 |
20120263232 | METHODS FOR ENCODING AND DECODING IMAGES, CORRESPONDING ENCODING AND DECODING DEVICES AND COMPUTER PROGRAMS - A method is provided for encoding an image represented by a sequence of symbols. The method includes the following steps: defining subsequences within the sequence; and going through the subsequences applying the following sub-steps for a routine subsequence: determining an adjacent routine encoded group including two previously encoded subsequences, one of which belongs to an adjacent encoded group associated with a subsequence that is separate from the routine subsequence; initializing a routine probability of occurrence of a symbol, taking into account two known probabilities of occurrence of the symbol, relating to two previously encoded subsequences of the adjacent routine encoded group; the consecutive entropic encoding of the symbols, and updating the routine probability of occurrence; and storing the routine probability of occurrence after encoding the last symbol. | 10-18-2012 |
20130034163 | METHODS AND DEVICES FOR ENCODING AND DECODING AN IMAGE SEQUENCE IMPLEMENTING A PREDICTION BY FORWARD MOTION COMPENSATION, CORRESPONDING STREAM AND COMPUTER PROGRAM - A method and apparatus for encoding a sequence of images by predicting at least one current image by forward motion compensation from at least one reference image. Prediction implements, for at least one current block of the current image: forward projection of a block of the reference image on the current image, delivering a projected block at least partially overlapping the current block; partitioning the current block delivering a sub-block at least partially overlapped by at least one projected block; and at least one iteration of the following steps for at least one overlapped sub-block: checking that the overlapped sub-block complies with a predetermined allotting criterion; with a positive check, allotting, to the overlapped sub-block, one of the projected motion vectors; and with a negative check, and so long as a predetermined minimum size is not reached for the overlapped sub-block: partitioning of the overlapped sub-block. | 02-07-2013 |
20140269900 | 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. | 09-18-2014 |
20140269925 | 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. | 09-18-2014 |