Abstract: Methods and systems for encoding and decoding data, such as point cloud data. The methods may include using a coder map to map a range of discrete dependency states to a smaller set of binary coders each having an associated coding probability. The selection of one of the discrete dependency states may be based on a contextual or situational factors, which may include a prediction process, for a particular symbol, such as an occupancy bit. The coder map is updated after each symbol is coded to possibly alter to which binary coder the selected discrete dependency state maps.

Abstract: This method for encoding a 3D point cloud comprises: —segmenting the point cloud into first patches (2); —determining inverse projection parameters of the patches (4); —projecting the first patches to planes using the inverse projection parameters (10); —encoding the planes (12); —determining sparse points in the point cloud not belonging to any patch (HC, 18); and—encoding the sparse points using an octree-decomposition (20).

Abstract: The present principles relate to a method and device for context-adaptive binary arithmetic coding a sequence of binary symbols representing a syntax element related to video data or a syntax element relative to a video data.

Abstract: The present disclosure generally relates to a device and a method of decoding a color picture from a bitstream.

Abstract: Methods and devices for encoding a point cloud. A predictor-copy coding mode is described in which an encoder copies the predicted points for a sub-volume rather than encoding the occupancy data for the original points in the sub-volume. A predictor-copy coding mode flag is coded in the bitstream to signal to the decoder whether predictor-copy coding mode is active or inactive. The predictor-copy coding mode flag may only be coded for sub-volumes that are eligible to use the mode. Eligibility may be based on depth within the coding tree and/or size of the sub-volume. Predictor-copy coding mode has the result of early termination of a branch of the coding tree. Instead of decoding the occupancy for the remainder of the branch, a decoder copies the predicted points that are positioned within the sub-volume as the reconstructed points of the point cloud for that sub-volume.

Abstract: Network equipment for establishing a manifest to be provided to a requesting terminal configured to receive a multimedia content divided into segments from a network equipment, each segment being available in one or more representations, said manifest listing available representations for the multimedia content and specifying a plurality of adaptation sets, each adaptation set defining a spatial object of the multimedia content, the spatial objects of the adaptation sets defining a whole spatial object is described. The network equipment includes at least one memory and at least one processing circuitry configured to define, in the manifest, a type of mapping of the multimedia content to the whole spatial object and a point of reference in one adaptation set of reference amongst the adaptation sets, and associate depth information with each adaptation set.

Abstract: Methods and devices for lossy encoding of point clouds. Rate-distortion optimization is used in coding an occupancy pattern for a sub-volume to determine whether to invert any of the bits of the occupancy pattern. The assessment may be a greedy evaluation of whether to invert bits in the coding order. Inverting a bit of the occupancy pattern amounts to adding or removing a point from the point cloud. A distortion metric may measure distance between the point added or removed and its nearest neighbouring point.

Abstract: The present principles generally relate to encoding and decoding of a point cloud representing the geometry of a point cloud representing a 3D object. According to the invention, prediction is used in the encoding process of the splitting information of the local octree-based structure and/or in the 10 encoding process of the occupancy information of the leaf cubes of the local octree-based structure. A predictor of the local octree-based structure is used for determining the context of the context-dependent entropy encoding in order to reduce the number of bits needed for the octree encoding.

Abstract: The present principles relates to a method and device for tone-mapping an input picture by using a parametric tone-adjustment function. The method is characterized in that the method comprises determining at least one parameter of said tone-adjustment function modulated by a brightness level of the input picture.

Abstract: The present disclosure generally relates to a method and device of encoding a color picture having color components (Ec) comprising obtaining (11) a luminance component (L) and two chrominance components (C1, C2) from the color picture to be encoded. The method for encoding a color picture having color components comprising obtaining at least one chrominance component from the color picture to be encoded, characterized in that the method further comprises: determining a first factor based on the value of each pixel (i) of said luminance component; obtaining at least one final chrominance component by scaling said at least one chrominance component by said first factor; and encoding (13) said at least one final chrominance component.

Abstract: Methods and devices for encoding a point cloud. A bit sequence signalling an occupancy pattern for sub-volumes of a volume is coded using binary entropy coding. For a given bit in the bit sequence, a context may be based on a sub-volume neighbour configuration for the sub-volume corresponding to that bit. The sub-volume neighbour configuration depends on an occupancy pattern of a group of sub-volumes of neighbouring volumes to the volume, the group of sub-volumes neighbouring the sub-volume corresponding to the given bit. The context may be further based on a partial sequence of previously-coded bits of the bit sequence.

Abstract: Methods and devices for encoding or decoding a point cloud. A bit sequence signaling an occupancy pattern for sub-volumes of a volume is coded using entropy coding. For a current sub-volume, probabilities of respective entropy coders for entropy coding the occupancy pattern may be selected based on occupancy data for a plurality of neighbouring sub-volumes of the current sub-volume and on occupancy data for subdivisions of the neighbouring sub-volumes.

Abstract: Methods and devices for encoding a point cloud. A predictor-copy coding mode is described in which an encoder copies the predicted points for a sub-volume rather than encoding the occupancy data for the original points in the sub-volume. A predictor-copy coding mode flag is coded in the bitstream to signal to the decoder whether predictor-copy coding mode is active or inactive. The predictor-copy coding mode flag may only be coded for sub-volumes that are eligible to use the mode. Eligibility may be based on depth within the coding tree and/or size of the sub-volume. Predictor-copy coding mode has the result of early termination of a branch of the coding tree. Instead of decoding the occupancy for the remainder of the branch, a decoder copies the predicted points that are positioned within the sub-volume as the reconstructed points of the point cloud for that sub-volume.

Abstract: Methods and devices for encoding a point cloud, where occupancy data for child sub-volumes is context-adaptively encoded based on contexts selected, at least in part, using an occupancy score determined for each child sub-volume. The occupancy score for each child sub-volume of a parent sub-volume is determined based on the occupancy status of a plurality of neighbouring sub-volumes neighbouring the parent sub-volume and a respective weight assigned to each of the neighbouring sub-volumes vis-à-vis that child sub-volume, and wherein the respective weight reflects a strength of correlation between occupancy of that neighbouring sub-volume and occupancy of that child sub-volume.

Abstract: Methods and devices for lossy encoding of point clouds. Rate-distortion optimization is used in coding an occupancy pattern for a sub-volume to determine whether to invert any of the bits of the occupancy pattern. The assessment may be a greedy evaluation of whether to invert bits in the coding order. Inverting a bit of the occupancy pattern amounts to adding or removing a point from the point cloud. A distortion metric may measure distance between the point added or removed and its nearest neighbouring point.

Abstract: Methods and devices for encoding a point cloud. A bit sequence signaling an occupancy pattern for sub-volumes of a volume is coded. Predictive coding is used to find a set of predicted points, from which a corresponding predicted occupancy pattern may be determined. The predicted occupancy pattern may be used to determine the contexts for entropy coding the occupancy pattern. The determination may include determining for each sub-volume, whether it contains a predicted point or not and, in some cases, the count of predicted points within the sub-volume. Various threshold numbers of predicted points may cause the selection of different context sets for coding the occupancy pattern. The predictive coding may be enabled by determining that the prediction of occupancy of a parent volume to the volume met a threshold level of accuracy.

Abstract: A decoding method including decoding one standard dynamic range (SDR) luminance component and two SDR chrominance components from a bitstream produced by an encoder and color converting the SDR luminance component and the two decoded SDR chrominance components. A dynamic expansion function is applied on the color converted SDR luminance component to obtain a high dynamic range (HDR) luminance component, wherein the dynamic expansion function is the inverse of a dynamic reduction function applied on the HDR luminance component on the encoder's side. A color transfer operation is applied on the color converted SDR chroma components to obtain an HDR chrominance component and an HDR chrominance component in XYZ color space. A color conversion matrix is applied on the HDR luminance component, the HDR chrominance component and the HDR chrominance component to obtain an HDR picture in RGB color space.

Abstract: Methods and devices for encoding a point cloud. A bit sequence signaling an occupancy pattern for sub-volumes of a volume is coded. Predictive coding is used to find a set of predicted points, from which a corresponding predicted occupancy pattern may be determined. The search for and selection of a coding mode for generating the set of predicted points may include a geometric distortion metric for evaluating how closely the geometry of the predicted set of points aligns with the geometry of the set of points to be coded. The geometric distortion metric may include a sum of absolute value distance between each point and its nearest predicted point. The metric may sum a logarithm of the distances to match more closely with coding rate cost.

Abstract: The present principles generally relate to encoding and decoding of a point cloud representing the geometry of a point cloud representing a 3D object. According to the invention, prediction is used in the encoding process of the splitting information of the local octree-based structure and/or in the 10 encoding process of the occupancy information of the leaf cubes of the local octree-based structure. A predictor of the local octree-based structure is used for determining the context of the context-dependent entropy encoding in order to reduce the number of bits needed for the octree encoding.

Abstract: Methods and devices for encoding a point cloud. A bit sequence signaling an occupancy pattern for sub-volumes of a volume is coded. Predictive coding is used to find a set of predicted points, from which a corresponding predicted occupancy pattern may be determined. The search for and selection of a coding mode for generating the set of predicted points may include a geometric distortion metric for evaluating how closely the geometry of the predicted set of points aligns with the geometry of the set of points to be coded. The geometric distortion metric may include a sum of absolute value distance between each point and its nearest predicted point. The metric may sum a logarithm of the distances to match more closely with coding rate cost.