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公开(公告)号：EP4226624A1
公开(公告)日：2023-08-16
申请号：EP20956471.5
申请日：2020-10-06
IPC分类号： H04N19/597 , H04N19/186 , H04N19/91 , H04N19/96 , G06T9/40
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公开(公告)号：EP3896657A1
公开(公告)日：2021-10-20
申请号：EP20196651.2
申请日：2020-09-17
摘要： A method for encoding and decoding, an encoder and decoder for a point cloud is disclosed. The method for encoding a point cloud to generate a bitstream of compressed point cloud data, wherein the point cloud's geometry is represented by an octree-based structure with a plurality of nodes having parent-child relationships by recursively splitting a volumetric space containing the point cloud into sub-volumes each associated with a node of the octree-based structure, comprises: Determining an occupancy pattern for a parent node based on the occupancy of its child nodes; Determining a planar context information for at least one of the child nodes, wherein the planar context information of a present child node is determined according to the occupancy pattern of the present parent node and the occupancy pattern of at least one neighboring parent node positioned directly next to the present parent node; and Entropy encoding/decoding the occupancy pattern parent node based on the determined planar context information to produce encoded/decoded data for the bitstream.
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公开(公告)号：EP4364416A1
公开(公告)日：2024-05-08
申请号：EP21947675.1
申请日：2021-07-02
IPC分类号： H04N19/169
CPC分类号： H04N19/597 , G06T9/001 , G06T9/004
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公开(公告)号：EP3929874A1
公开(公告)日：2021-12-29
申请号：EP20196653.8
申请日：2020-09-17
IPC分类号： G06T9/40
摘要： A method for encoding and decoding, an encoder and decoder for a point cloud is disclosed. The method for encoding a point cloud to generate a bitstream of compressed point cloud data, wherein the point cloud's geometry is represented by an octree-based structure with a plurality of nodes having parent-child relationships by recursively splitting a volumetric space containing the point cloud into sub-volumes each associated with a node of the octree-based structure, comprising the steps of: Determining a coding mode, wherein the coding mode includes planar coding mode and angular coding mode; Obtaining coding context information for a present child node, wherein if the coding mode is the planar coding mode, coding context information includes planar context information, wherein planar context information of the present child node is determined according to the occupancy pattern of the present parent node and the occupancy pattern of at least one neighboring parent node positioned directly next to the present parent node; and if the coding mode is the angular coding mode, the coding context information of a present child node includes planar information of the present parent node and the occupancy of the vertical parent neighbor adjacent to the present parent node. At last entropy encoding the occupancy of the present child node based on the determined coding context information to produce encoded data for the bitstream.
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5.发明公开
公开(公告)号：EP4413537A1
公开(公告)日：2024-08-14
申请号：EP21819716.8
申请日：2021-11-04
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公开(公告)号：EP3929873A1
公开(公告)日：2021-12-29
申请号：EP20196648.8
申请日：2020-09-17
IPC分类号： G06T9/40
摘要： Method for encoding and decoding attributes of a point cloud, as well as encoder and decoder. Therein, the method for encoding attributes of points of a point cloud to generate a bitstream of compressed point cloud data, wherein the point cloud's geometry is represented by a voxel-based structure with a plurality of nodes having parent-child relationships by recursively splitting a volumetric space containing the point cloud into sub-volumes each associated with a node of the voxel-based structure, comprises the steps of: Determining a true transform coefficient by applying Region-Adaptive Hierarchal Transform, RAHT, to the attributes of a present node; Determining a difference between the attributes of a present parent node and each node of a first set of nodes sharing a face or an edge with the present node, wherein the present parent node is the parent node of the present node; Selecting a second set from the first set of parent nodes according to the difference, wherein preferably the second set of parent nodes includes the present parent node; Determining a predicted value for the attributes of the present node according to the attributes of the second set of parent nodes; Determining a predicted transform coefficient by applying RAHT to the predicted value of the attributes of the present node; Determining a residual from the true transform coefficient and the predicted transform coefficient; and Encoding the residual to produce encoded data of attributes of the point cloud for the bitstream.
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