Orange

B-com

France Telecom

Joel Jung

Felix Henry

Bappaditya Ray

Elie Mora

Patrick Boissonade

Pavel Nikitin

Antoine Dricot

Jean Marc Thiesse

Kartik Viswanathan

Marco Cagnazzo

Beatrice Pesquet-Popescu

Charlene Mouton

Guillaume Laroche

Stephane Pateux

Jean-Marc Thiesse

Dang Khoa Vo Nguyen

A process for coding an image of a view from among a plurality of views, including the following steps: selecting a first or a second coding method to code image data from the image; generating a data signal containing information indicating whether it is the first or the second coding method that has been selected, and, if it is the first coding method, coding the original image data so as to provide coded original data, and, if it is the second coding method, coding processed image data from the image obtained by image processing of the original image data so as to provide coded processed data; and coding information describing the image processing which has been applied.

Coding and decoding of an omnidirectional video

A method and a device for decoding a data stream representative of a multi-view video. Syntax elements are obtained from at least one part of the stream data, and used to reconstruct at least one image of a view of the video. Then, at least one item of metadata in a predetermined form is obtained from at least one obtained syntax element, and provided to an image processing module. Also, a method and a device for processing images configured to read the at least one item of metadata in the predetermined form and use it to generate at least one image of a virtual view from a reconstructed view of the multi-view video.

Method and device for multi-view video decoding and method and device for image processing

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.

Method for encoding and decoding images according to distinct zones, encoding and decoding device, and corresponding computer programs

A method and a device for decoding a data stream representative of a multi-view video. Syntax elements are obtained from at least one part of the stream data, and used to reconstruct at least one image of a view of the video. Then, at least one item of metadata in a predetermined form is obtained from at least one obtained syntax element, and provided to an image processing module. Also provided are a method and a device for processing images configured to read said at least one item of metadata in the predetermined form and use it to generate at least one image of a virtual view from a reconstructed view of the multi-view video.

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.

Method for encoding and decoding images, encoding and decoding device, and corresponding computer programs

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.

Methods and devices for encoding and decoding a multi-view video sequence representative of an omnidirectional video

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.

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.

Derivation of disparity motion vector, 3D video coding and decoding using such derivation

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.

Method and device for coding and decoding a multi-view sequence

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.

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Le Mesnil Saint Denis, France

Joel Jung