公开(公告)号：US11893691B2

公开(公告)日：2024-02-06

申请号：US17345063

申请日：2021-06-11

申请人： TENCENT AMERICA LLC

发明人： Anique Akhtar ,  Wen Gao ,  Xiang Zhang ,  Shan Liu

IPC分类号： G06T17/20 ,  G06T3/40

CPC分类号： G06T17/205 ,  G06T3/40

摘要： A method, computer program, and computer system is provided for processing point cloud data. Quantized point cloud data including a plurality of voxels is received. An occupancy map is generated for the quantized point cloud corresponding to lost voxels during quantization from among the plurality of voxels. A point cloud is reconstructed from the quantized point cloud data based on populating the lost voxels.

公开(公告)号：US20240015289A1

公开(公告)日：2024-01-11

申请号：US18312675

申请日：2023-05-05

申请人： Tencent America LLC

发明人： Thuong NGUYEN CANH ,  Xiaozhong Xu ,  Xiang Zhang ,  Shan Liu

IPC分类号： H04N19/124 ,  H04N19/597 ,  H04N19/172 ,  H04N19/184

CPC分类号： H04N19/124 ,  H04N19/597 ,  H04N19/172 ,  H04N19/184

摘要： A method and apparatus comprising computer code configured to cause a processor or processors to obtain an input mesh comprising volumetric data of at least one three-dimensional (3D) visual content, derive a plurality of submeshes of the input mesh from a frame of the volumetric data, set bitdepths to a first submesh and a second submesh from the submeshes, a first bitdepth being different than a second bitdepth, quantize the first submesh and the second submesh based on respective ones of the first bitdepth and the second bitdepth, and signal a result of quantizing the first submesh and the second submesh.

公开(公告)号：US20230412849A1

公开(公告)日：2023-12-21

申请号：US18314884

申请日：2023-05-10

申请人： Tencent America LLC

发明人： Chao HUANG ,  Thuong Nguyen Canh ,  Xiaozhong Xu ,  Jun Tian ,  Xiang Zhang ,  Shan Liu

IPC分类号： H04N19/91 ,  H04N19/119 ,  H04N19/136 ,  H04N19/96

CPC分类号： H04N19/91 ,  H04N19/119 ,  H04N19/136 ,  H04N19/96

摘要： A method and apparatus comprising computer code configured to cause a processor or processors to obtain an input mesh corresponding to volumetric data of at least one three-dimensional (3D) visual content, derive a curve of a mesh sequence from the input mesh corresponding to volumetric data, the curve including a plurality of vertices of the input mesh of the mesh sequence, subdivide the derived curve of the mesh sequence by adding subdivided vertices, computing a displacement vector for each of the plurality of subdivided vertices; and entropy code the volumetric data based on the displacement vector from at least one of the subdivided vertices.

公开(公告)号：US11750839B2

公开(公告)日：2023-09-05

申请号：US17724250

申请日：2022-04-19

申请人： Tencent America LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： H04N19/597 ,  H04N19/96 ,  H04N19/169 ,  H04N19/70 ,  H04N19/46 ,  H04N19/436

CPC分类号： H04N19/597 ,  H04N19/1883 ,  H04N19/436 ,  H04N19/46 ,  H04N19/70 ,  H04N19/96

摘要： Aspects of the disclosure provide methods, apparatuses, and a non-transitory computer-readable medium for point cloud coding. In a method, when parallel octree coding is enabled for occupancy codes of nodes in an octree partitioning structure of the point cloud, syntax information of the point cloud is decoded from a coded bitstream and a bitstream offset of an octree depth is determined. The syntax information indicates a bitstream length of the octree depth at which the parallel octree coding is enabled. Parallel decoding is performed on the occupancy codes of the nodes of the octree depth based on the bitstream offset and the bitstream length of the octree depth. Further, the point cloud is reconstructed based on the occupancy codes of the nodes.

公开(公告)号：US11711545B2

公开(公告)日：2023-07-25

申请号：US17724260

申请日：2022-04-19

申请人： Tencent America LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： H04N19/597 ,  H04N19/96 ,  H04N19/169 ,  H04N19/70 ,  H04N19/46 ,  H04N19/436

CPC分类号： H04N19/597 ,  H04N19/1883 ,  H04N19/436 ,  H04N19/46 ,  H04N19/70 ,  H04N19/96

摘要： Aspects of the disclosure include a method for point cloud coding. In the method, whether decoding of occupancy codes of nodes in a range of octree partition depths in an octree partitioning structure of a point cloud reaches a minimum octree partition depth at which parallel decoding is enabled is determined. Arithmetic coding information for decoding the occupancy codes of the nodes in the minimum octree partition depth is stored based on the decoding of the occupancy codes of the nodes in the range of octree partition depths reaching the minimum octree partition depth. The parallel decoding is performed on occupancy codes of the nodes in each of the at least one remaining octree partitions depth based on the stored arithmetic coding information. The point cloud is reconstructed based on the occupancy codes of the nodes in the range of octree partition depths in the octree partitioning structure.

公开(公告)号：US11710260B2

公开(公告)日：2023-07-25

申请号：US17859548

申请日：2022-07-07

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： G06T9/40 ,  G06T7/10 ,  G06F1/03

CPC分类号： G06T9/40 ,  G06F1/03 ,  G06T7/10 ,  G06T2207/10028

摘要： A method for coding information of a point cloud comprises obtaining the point cloud including a set of points in a three-dimensional space; partitioning the point cloud into a plurality of objects and generating occupancy information for each of the plurality of objects; and encoding the occupancy information by taking into account the distance between the plurality of objects.

公开(公告)号：US11670045B2

公开(公告)日：2023-06-06

申请号：US17502973

申请日：2021-10-15

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Bing Jian ,  Lu He ,  Haichao Zhu ,  Shan Liu ,  Kelin Liu ,  Weiwei Feng

IPC分类号： G06T17/00 ,  G06T7/73 ,  G06T7/60 ,  G06T7/50 ,  G06T7/90

CPC分类号： G06T17/00 ,  G06T7/50 ,  G06T7/60 ,  G06T7/73 ,  G06T7/90 ,  G06T2200/24 ,  G06T2207/20164

摘要： Aspects of the disclosure include methods, apparatuses, and non-transitory computer-readable storage mediums for generating a three-dimensional (3D) geometry of a room from a panorama image of the room. An apparatus includes processing circuitry that determine two-dimensional (2D) positions of wall corner points of the room in the panorama image based on a user input. Each wall corner point is in one of a floor plane or a ceiling plane of the room. The processing circuitry calculates 3D positions of the wall corner points based on the 2D positions of the wall corner points, a size of the panorama image, and a distance between the floor plane and a capture position of a device capturing the panorama image, determines a room layout based on an order of the wall corner points, and generates the 3D geometry based on the room layout and the 3D positions of the wall corner points.

公开(公告)号：US20230156222A1

公开(公告)日：2023-05-18

申请号：US17977638

申请日：2022-10-31

申请人： TENCENT AMERICA LLC

发明人： Wen GAO ,  Xiang Zhang ,  Shan Liu

IPC分类号： H04N19/597

CPC分类号： H04N19/597

摘要： Methods and apparatuses of grid-based patch generation for point cloud coding are provided. The method includes obtaining an input that is a point cloud; grouping one or more voxels in the point cloud into one or more grids, the one or more grids having a cubic dimension; determining whether the cubic dimension associated with the one or more grids exceeds a threshold value; in response to determining the cubic dimension exceeds the threshold value, generating a gridded point cloud; generating one or more patches in the gridded point cloud; converting the one or more patches in the gridded point cloud to one or more patches in the input point cloud; outputting the one or more patches to one or more output devices.

公开(公告)号：US11615556B2

公开(公告)日：2023-03-28

申请号：US17231695

申请日：2021-04-15

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： G06T9/00 ,  G06T9/40

摘要： A method, computer program, and computer system is provided for decoding point cloud data. Data corresponding to a point cloud is received. A number of contexts associated with the received data is reduced based on occupancy data corresponding to one or more parent nodes and one or more child nodes within the received data. The data corresponding to the point cloud is decoded based on the reduced number of contexts.

公开(公告)号：US11582469B2

公开(公告)日：2023-02-14

申请号：US17494755

申请日：2021-10-05

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： H04N19/20 ,  H04N19/184 ,  H04N19/136 ,  H04N19/103

摘要： An apparatus for point cloud decoding includes processing circuitry. The processing circuitry receives, from a coded bitstream for a point cloud, encoded occupancy codes for nodes in an octree structure for the point cloud. The nodes in the octree structure correspond to three dimensional (3D) partitions of a space of the point cloud. Sizes of the nodes are associated with sizes of the corresponding 3D partitions. Further, the processing circuitry decodes, from the encoded occupancy codes, occupancy codes for the nodes. At least a first occupancy code for a child node of a first node is decoded without waiting for a decoding of a second occupancy code for a second node having a same node size as the first node. Then, the processing circuitry reconstructs the octree structure based on the decoded occupancy codes for the nodes, and reconstructs the point cloud based on the octree structure.