Abstract: Decoding an encoded data signal representing a multi-view video sequence representing an omnidirectional video and having a first view and a second view. The decoding includes reading from the signal parameters to obtain a homographic matrix, representing transformation of a plane of the second view into a plane of the second view. An image of the second view has an active zone including pixels which, when projected via the homographic matrix onto an image of the first view, are included in the image of the first view. An image of the second view is decoded by generating a reference image having pixel values determined from previously reconstructed pixels of an image of the first view and the homographic matrix and, for a block of the image of the second view, the reference image generated is included in the list of reference images when the block belongs to the active zone.

Abstract: A method for decoding a coded data stream representative of at least one image, the image being divided into blocks, a set of at least two prediction modes being available for predicting a current block. The method includes: obtaining at least two categories of prediction modes from the set; eliminating at least one category in accordance with at least one first predetermined elimination criterion; updating the categories not eliminated by deleting prediction modes that are common with the at least one eliminated category; and decoding, from the data stream, an information identifying for the current block a prediction mode among the modes of the updated categories.

Abstract: A method and device for encoding an image divided into blocks. The image contains two separate zones. The method implements the following: only in the event where the current block pertains to one of the zones of the image: encoding the current block using a prediction, the current block being predicted using a previously encoded and then decoded block located in the other zone of the image, the blocks of the other zone having been previously encoded and then decoded, and encoding information indicating the application of the prediction; and for any decoded block pertaining to the other zone of the image, storing the decoded block data.

Abstract: A decoding method including: decoding at a current time instant a current image having at least two views respectively representative of a same scene. The decoding includes: deriving a disparity motion vector for a current block; predictively decoding the current block according to the derived disparity motion vector; and during the deriving: constructing a plurality of lists of disparity motion vectors, including at least one list in which at least two disparity motion vectors have been derived respectively according to at least two different estimation methods; applying a first function to the at least two disparity motion vectors of the at least one list, to obtain one disparity motion vector for each of the at least one list, and applying a second function to the disparity motion vectors of the plurality of lists to deliver the derived disparity motion vector.

Abstract: A method for decoding a data stream representative of an image sequence. At least one current block of a current image in the image sequence is encoded using a predictor block of a reference image, the predictor block being identified in the reference image via location information. An information item enabling the reference image to be identified from a set of reference images is obtained. When the reference image satisfies a predetermined criterion, the location information of the predictor block is decoded using a first decoding mode, otherwise the location information of the predictor block is decoded using a second decoding mode, the first and second decoding modes including at least a different decoding parameter. The current block is then reconstructed from the predictor block.

Abstract: A method and device for encoding an image divided into blocks. The image contains separate first and second zones). The encoding implements the following, for at least one current block of the image: determining to which of the first and second zones the current block pertains; if the current block pertains to the first zone, encoding the current block by using a first encoding method; if the current block pertains to the second zone, encoding the current block by using a second encoding method including the following: from the position of the current block in the second zone, identifying a previously encoded, then decoded block located in the first zone of the image; and reproducing the value of at least one encoding parameter associated with the identified block.

Abstract: The invention concerns the encoding of at least one current integral image (IIj) captured by an image capture device, comprising the steps consisting of: —decomposing (C1) the current integral image into at least one frame (Vu) representing a given perspective of a scene and, from at least one image capturing parameter associated with the image capture device, —encoding (C2) said at least one frame, —decoding (C4) said at least one frame, —recomposing (C5) the current integral image from said at least one decoded frame by applying an inverse decomposition of said decomposition of the integral image and from said at least one image capturing parameter associated with the image capture device, said encoding method being characterised in that it implements the steps consisting of: —determining (C6) a residual integral image by comparing said at least one current integral image with said recomposed integral image, —encoding (C7) the data associated with the residual integral image and said at least one image capt

Abstract: A method is provided for decoding a current image having at least two views which are respectively representative of a same scene. The decoding method includes derivation of a disparity motion vector and, during the derivation: constructing at least one list of disparity motion vectors, in which at least two disparity motion vectors have been obtained respectively according to two different estimation methods; and applying a function to the at least two disparity motion vectors of the list. The method is applicable, for example, to a current image Ik of an MVV or MVD type.

Abstract: A method of encoding at least one image divided into blocks, implementing: encoding a first syntax element associated with a characteristic of the at least one image; encoding, for a current block to be encoded associated with at least one encoding parameter, the data of the current block; if the first syntax element is encoded according to a first predefined value representing the characteristic of the image, a second syntax element representing the value of the at least one encoding parameter is encoded only if the current block belongs to a predefined zone of the image; if the first syntax element is encoded according to a second predefined value representing the characteristic of the image, the second syntax element is encoded, whether or not the current block belongs to the predefined zone.

Abstract: A method for decoding a coded data stream representing a video having a first view and a second view different from the first view, in which a reference image of the second view is previously reconstructed. For a current block of a current image of the first view, a motion information item associated with the current block representative of a displacement of the current block in the previously reconstructed reference image, is obtained. A prediction block is obtained based on the previously reconstructed reference image of the second view and of the obtained motion information item. The current block is reconstructed based on the prediction block, a prediction residual information item decoded based on the coded data stream and a difference information item calculated between a first block associated with the first view and a second block associated with the second view and decoded based on the coded data stream.

Abstract: A method is provided for coding a current image. The method includes determining, in a first image, different from the current image, a group of k? pixels corresponding to a current group of k pixels (k??k) to be coded of the current image; calculating a motion vector between each of the k? pixels of the first image and a corresponding pixel of a second image different from the current image, on completion of which a field of k? motion vectors is obtained; and predicting the pixels or of the motion of the current group of k pixels of the current image on the basis of the field of k? motion vectors which is obtained.

Abstract: A method of decoding an encoded data stream representing at least one image subdivided into blocks. The method includes, for a current block of the image, and for each of at least two prediction modes available to predict the current block, obtaining a predictive block associated with the available mode; building a list having at least one of the available modes; for at least one mode included in the list, called a current mode, determining a distance measurement between the predictive block associated with the current mode and the other predictive blocks associated with the other available modes and obtained for the current block; modifying the list modified as a function of the determined measurement; decoding information identifying, for the current block, a prediction mode from the modified list from the encoded data stream; and rebuilding the current block from the predictive block associated with the identified prediction mode.

Abstract: A method for decoding a coded data stream representative of at least one image, the image being divided into blocks, a set of at least two prediction modes being available for predicting a current block. The method includes: obtaining at least two categories of prediction modes from the set; eliminating at least one category in accordance with at least one first predetermined elimination criterion; updating the categories not eliminated by deleting prediction modes that are common with the at least one eliminated category; and decoding, from the data stream, an information identifying for the current block a prediction mode among the modes of the updated categories.

Abstract: A method and apparatus for decoding a current view belonging to a previously coded multi-view image. The method includes: determining, in a set of views belonging to the multi-view image or to another multi-view image, a pathway of views that are necessary for the decoding of the current view, the pathway comprising at least one as yet undecoded view; decoding the at least one view not yet decoded; and decoding the current view on the basis of a set of coded data representative of at least one difference between the current view and another view of the multi-view image or of another multi-view image, and of the at least one decoded view.

Abstract: A method is provided for decoding at least one current encoded block of a first image relative to a reference block of a second image including at least one common element with the first image, wherein the reference block has been previously decoded. The method includes: filtering the decoded reference block; estimating, only on the basis of the filtered decoded reference block, at least one value of a local characteristic of the filtered decoded reference block; determining, on the basis of the estimated value of the local characteristic: a set of decoding information to be used for decoding the current block, a method for decoding the current block, on the basis of the estimated value of the local characteristic, decoding the current block on the basis of the set of determined decoding information and according to the determined decoding method.

Abstract: The invention relates to a method for predicting a movement vector (MVp1) of a partition (P1) of a current image (IN) from a plurality of n reference movement vectors associated respectively with n reference partitions that have been previously encoded and decoded. For a spatial prediction of one such vector, when the geometric shape of the current partition is different from that of k adjacent reference partitions (pr1, pr2, . . . prk), with k?n, the movement vector of the current image partition is determined from a function of at least one reference movement vector belonging to a set of k reference movement vectors associated respectively with k adjacent reference partitions.

Abstract: An encoding device and method are provided for encoding at least one image split into partitions. The method implements, for a current partition to be encoded, steps of: selecting at least one causal partition already encoded and then decoded; calculating at least one optimal encoding parameter associated with the selected causal partition, according to a predetermined criterion of encoding performance, by comparing a plurality of encoding parameters applied to the selected causal partition; and encoding the current partition by using the calculated optimum encoding parameter.

Abstract: A method for encoding a digital image, which is divided into a plurality of blocks of pixels processed in a defined order. The method includes the following acts for a current block: a) obtaining a basic motion vector of the current block with respect to a reference image previously decoded; b) obtaining a partitioning into sub-blocks of the area pointed to in the reference image by the basic motion vector and applying the partitioning obtained to the current block; and c) scanning the sub-blocks of the current block according to a predetermined scanning order and encoding the sub-blocks scanned. The encoding includes modifying the partitioning of the current block into sub-blocks according to predetermined rules, coding the sub-blocks of the modified partitioning comprising coding reporting information on the modification of the partitioning, and validating the modified partitioning by applying a rate-distortion criterion to the coded sub-blocks of the modified partitioning.

Abstract: A method is provided for decoding a signal that represents at least one image. The method implements at least one iteration of the following steps, for at least one block of the image to be decoded: determining at least one selection parameter from at least one characteristic associated with at least one reference pixel of a reference region of the image, the reference region including at least one previously encoded/decoded block and/or at least one pixel predicted in a preceding iteration; selecting at least one pixel to be predicted in the block to be decoded from the at least one selection parameter; and for at least one selected pixel to be predicted, referred to as an anchor pixel, predicting the anchor pixel from at least one reference pixel, thereby outputting a predicted pixel.

Abstract: A method for coding a current block of a first image component with respect to a reference block of at least one second image component. The first and second image components are representative of the same scene, and the reference block being previously subjected to coding by partitioning, and then to decoding. Partitioning of the reference block is performed a plurality of times until a determined level of depth of partitioning is obtained. The coding method includes, as a function of the type of the first and second image components: partitioning the current block a plurality of times until a level of depth of partitioning dependent on the level of partitioning of the reference block is obtained; or partitioning the current block on the basis of a level of depth of partitioning previously initialized by a level of partitioning depending on the level of partitioning for the reference block.