Abstract: A method for decoding a data stream representing a multi-view video, including coded data representative of at least one sub-image, including texture data and depth data associated with the texture data, the sub-image including at least one zone, referred to as a useful zone, for generating an image of a view. An indicator is decoded, indicating whether the sub-image is coded according to a first method or a second method. When the indicator indicates that the sub-image is coded according to the first method, a binary map is decoded indicating for at least one pixel of the sub-image whether the pixel belongs to the useful zone. When the indicator indicates that the sub-image is coded according to the second method, the texture and depth data of the sub-image are decoded. The depth data of the sub-image for the pixels situated outside the useful zone includes a decoded depth value.

Abstract: Synthesis of an image of a view from data of a multi-view video. The synthesis includes an image processing phase as follows: generating image synthesis data from texture data of at least one image of a view of the multi-view video; calculating an image of a synthesised view from the generated synthesis data and at least one image of a view of the multi-view video; analysing the image of the synthesised view relative to a synthesis performance criterion; if the criterion is met, delivering the image of the synthesised view; and if not, iterating the processing phase. The calculation of an image of a synthesised view at a current iteration includes modifying, based on synthesis data generated in the current iteration, an image of the synthesised view calculated during a processing phase preceding the current iteration.

Abstract: A method of predicting an objective quality score of an image or a video includes obtaining at least one selection feature associated with the image or video, and selecting, based on the at least one selection feature, a set of parameters among a plurality of sets of parameters of a learning based prediction model (LBPM). The selected set of parameters results from training the LBPM using training images or videos having the at least one selection feature. The method further includes determining the objective quality score of the image or video by applying the LBPM configured with the selected set of parameters, based on at least one qualifying feature associated with the image or video.

Abstract: 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.

Abstract: A method of encoding includes receiving a polygon mesh comprising a plurality of faces and a plurality vertices; separating the polygon mesh into a left side half mesh and a right side half mesh by a plane; extracting the left side half mesh comprising a first plurality of vertices in-plane and on a left side of the polygon mesh; remapping the plurality of faces to represent a new vertices order in order to generate a plurality of remapped faces; extracting the plurality of remapped faces; compressing the left side half mesh by a codec; predicting a location of a second plurality of vertices on the right side half mesh using a symmetry based prediction on the compressed left side half mesh; and connecting the left side half mesh and the right side half mesh.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Some aspects of the disclosure provide a method of media processing. The method includes encoding, by processing circuitry of a server device, first media data of a basic view of a scene and second media data of an alternate view of the scene into a bitstream. The second media data lacks reflectance information for one or more non-diffuse objects of the scene in the alternate view. The method further includes generating non-diffuse data that indicates the reflectance information for the one or more non-diffuse objects of the scene and transmitting the bitstream and the non-diffuse data to a client device. The non-diffuse data includes a first number of data pieces that indicate the reflectance information, the first number is smaller than a second number for pixels in the one or more non-diffuse objects. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: A method of synthesizing an image includes receiving a coded video stream corresponding to different views of a scene acquired by a plurality of cameras, and identifying one or more derivable depth blocks of a target depth map corresponding to an image of the coded video stream. The method further includes determining a corresponding operation to derive a depth of each of the one or more derivable depth blocks, the operation being applied to a depth of a reference depth block included in a depth map of a reference image in the coded video bitstream. The method further includes obtaining the target depth map corresponding to the image by executing the corresponding operation of the respective derivable depth block, and synthesizing a new image according to the target depth map and at least one decoded image from the coded video stream.

Abstract: Aspects of the disclosure provides a method for updating an objective quality score of a video flow. The method includes determining the objective quality score of the video flow that is generated based at least on a game scenario. The objective quality score can indicate a quality of the video flow. The method further includes updating the objective quality score based on a mapping function parameterized by at least one update parameter. The at least one update parameter can be dependent on at least one characteristic of the game scenario and at least one characteristic of a video encoder that is configured to encode the video flow. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: A method for decoding a data stream representing a multi-view video, including coded data representative of at least one sub-image, including texture data and depth data associated with the texture data, the sub-image including at least one zone, referred to as a useful zone, for generating an image of a view. An indicator is decoded, indicating whether the sub-image is coded according to a first method or a second method. When the indicator indicates that the sub-image is coded according to the first method, a binary map is decoded indicating for at least one pixel of the sub-image whether the pixel belongs to the useful zone. When the indicator indicates that the sub-image is coded according to the second method, the texture and depth data of the sub-image are decoded. The depth data of the sub-image for the pixels situated outside the useful zone includes a decoded depth value.

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 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 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.

Abstract: A method for decoding a data stream representing a multi-view video, including coded data representative of at least one sub-image, including texture data and depth data associated with the texture data, the sub-image including at least one zone, referred to as a useful zone, for generating an image of a view. An indicator is decoded, indicating whether the sub-image is coded according to a first method or a second method. When the indicator indicates that the sub-image is coded according to the first method, a binary map is decoded indicating for at least one pixel of the sub-image whether the pixel belongs to the useful zone. The texture and depth data of the sub-image are decoded, when the indicator indicates that the sub-image is coded according to the second method, the depth data of the sub-image for the pixels situated outside the useful zone including a decoded depth value.

Abstract: 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.

Abstract: A method for processing multi-view video data including, for at least one block of an image of a view encoded in an encoded data stream representing the multi-view video, obtaining at least one information item, which specifies a mode for obtaining a synthesis data item, from among first and second obtaining modes. The synthesis data item is used to synthesize at least one image of an intermediate view of the multi-view video, the intermediate view not being encoded in the encoded data stream. The first obtaining mode involves decoding an information item representing the synthesis data item from the encoded data stream, the second obtaining mode involves obtaining the synthesis data item from at least the reconstructed encoded image. At least one part of an image of the intermediate view is synthesised from at least the reconstructed encoded image and the synthesis data item obtained by the specified mode.

Abstract: Synthesis of an image of a view from data of a multi-view video. The synthesis includes an image processing phase as follows: generating image synthesis data from texture data of at least one image of a view of the multi-view video; calculating an image of a synthesised view from the generated synthesis data and at least one image of a view of the multi-view video; analysing the image of the synthesised view relative to a synthesis performance criterion; if the criterion is met, delivering the image of the synthesised view; and if not, iterating the processing phase. The calculation of an image of a synthesised view at a current iteration includes modifying, based on synthesis data generated in the current iteration, an image of the synthesised view calculated during a processing phase preceding the current iteration.

Abstract: A method for synthesizing an image of a view from images of N (N>2), implemented by an image synthesis device. The method includes: projecting, to a position corresponding to the image of the view to be synthesized, N depth maps associated with the N views, respectively; for at least one given pixel of at least one projected depth map, for which a depth value has been associated on completion of projection, modifying the depth value of the at least one given pixel if an item of reliability information associated with the depth value is at a certain value, the modification using the depth value of a pixel whose position corresponds to that of the at least one given pixel, in at least one other projected depth map, which generates at least one modified projected depth map.