公开(公告)号：US11514612B2

公开(公告)日：2022-11-29

申请号：US17203155

申请日：2021-03-16

申请人： Tencent America LLC

发明人： Sehoon Yea ,  Wen Gao ,  Xiang Zhang ,  Shan Liu

IPC分类号： G06T9/00 ,  G06T17/00 ,  H04N19/96 ,  H04N19/184 ,  H04N19/167 ,  H04N19/103

摘要： A method of point cloud geometry decoding in a point cloud decoder is provided. In the method, first signaling information is received from a coded bitstream for a point cloud that includes a set of points in a three-dimensional (3D) space. The first signaling information indicates partition information of the point cloud. Second signaling information is determined based on the first signaling information indicating a first value. The second signaling information is indicative of a partition mode of the set of points in the 3D space. Further, the partition mode of the set of points in the 3D space is determined based on the second signaling information. The point cloud is reconstructed subsequently based on the partition mode.

公开(公告)号：US11417030B2

公开(公告)日：2022-08-16

申请号：US17080044

申请日：2020-10-26

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： G06T9/00 ,  G06T9/40 ,  G06F1/03 ,  G06T7/10

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：US11381840B2

公开(公告)日：2022-07-05

申请号：US16909642

申请日：2020-06-23

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Sehoon Yea ,  Shan Liu

IPC分类号： H04N19/597 ,  H04N19/169 ,  H04N19/174

摘要： A method of point cloud geometry decoding in a point cloud decoder can include receiving a bitstream including a slice of a coded point cloud frame, and reconstructing an octree representing a geometry of points in a bounding box of the slice where a current node of the octree is partitioned with a quadtree (QT) partition or a binary tree (BT) partition.

公开(公告)号：US11223836B2

公开(公告)日：2022-01-11

申请号：US17063411

申请日：2020-10-05

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.

公开(公告)号：US20210250618A1

公开(公告)日：2021-08-12

申请号：US17085395

申请日：2020-10-30

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： H04N19/70 ,  H04N19/119 ,  H04N19/96 ,  H04N19/184 ,  H04N19/136

摘要： A method of decoding encoded information of a point cloud may be performed by at least one processor and comprises: obtaining an encoded bitstream, the encoded bitstream including encoded information of a point cloud including a set of points in a three-dimensional space; and determining a type of partitioning used to encode the information of the point cloud by at least one of parsing signals of at least three binary syntaxes or inferring at least one syntax of the at least three binary syntaxes.

公开(公告)号：US20210217205A1

公开(公告)日：2021-07-15

申请号：US17142706

申请日：2021-01-06

申请人： TENCENT AMERICA LLC

发明人： Sehoon Yea ,  Stephan Wenger ,  Shan Liu ,  Wen Gao ,  Xiang Zhang

IPC分类号： G06T9/40 ,  H04N19/96 ,  H04N19/46 ,  H04N19/597

摘要： A method of point cloud attribute coding is performed by at least one processor and includes receiving a point cloud data set comprising a bounding box. A determination is made as to whether the bounding box is symmetric or asymmetric. A quad-tree-binary-tree (QtBt) decomposition is performed on the point cloud data set based on the bounding box being asymmetric.

公开(公告)号：US12131506B2

公开(公告)日：2024-10-29

申请号：US17501779

申请日：2021-10-14

申请人： TENCENT AMERICA LLC

发明人： Xiang Zhang ,  Wen Gao ,  Shan Liu

IPC分类号： G06T9/00 ,  G06T17/00

CPC分类号： G06T9/001 ,  G06T17/00 ,  G06T2210/12 ,  G06T2210/56

摘要： Aspects of the disclosure include methods, apparatuses, and non-transitory computer-readable storage mediums for point cloud compression. An apparatus includes processing circuitry that encodes information associated with a current point of a plurality of points of a point cloud. The plurality of points is partitioned into multiple bounding boxes. The processing circuitry determines whether a first size of a hash table is greater than or equal to a predetermined maximum size of the hash table. The processing circuitry removes information associated with non-boundary points in the multiple bounding boxes from the hash table based on the first size of the hash table being greater than or equal to the predetermined maximum size of the hash table. The processing circuitry stores the encoded information associated with the current point into the hash table.

公开(公告)号：US12062206B2

公开(公告)日：2024-08-13

申请号：US17497025

申请日：2021-10-08

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： G06T7/00 ,  G06T7/73

CPC分类号： G06T7/73 ,  G06T2207/30204 ,  G06T2207/30244

摘要： A method, computer program, and computer system is provided for 3D pose graph reconstruction. 3D reconstruction of indoor buildings for VR/AR applications, such as virtual touring, digital museum, and virtual home sale, may be performed based on estimating pose graph and transformation matrix between cameras by recognizing markers on the ground in panorama images. Image data corresponding to one or more views of a first camera is received. One or more markers corresponding to a second camera are identified within the received image data. A pose graph corresponding to the one or more views of the first camera is constructed based on the identified one or more markers, the pose graph comprising at least an edge.

公开(公告)号：US11967025B2

公开(公告)日：2024-04-23

申请号：US17950836

申请日：2022-09-22

申请人： Tencent America LLC

发明人： Chao Huang ,  Xiang Zhang ,  Jun Tian ,  Xiaozhong Xu ,  Shan Liu

IPC分类号： G06T17/20 ,  G06T7/13

CPC分类号： G06T17/205 ,  G06T7/13 ,  G06T2207/20164

摘要： In some examples, an apparatus for mesh processing includes processing circuitry. The processing circuitry receives a first mesh frame with polygons representing a surface of an object, and determining that the first mesh frame is a non manifold type mesh in response to one or more singularity components in the first mesh frame. The processing circuitry converts the first mesh frame to a second mesh frame that is a manifold type mesh. The first mesh frame has first boundary loops that respectively correspond to second boundary loops in the second mesh frame. The processing circuitry detects the second boundary loops in the second mesh frame, and determines the first boundary loops in the first mesh frame according to the second boundary loops in the second mesh frame.

公开(公告)号：US20240087173A1

公开(公告)日：2024-03-14

申请号：US18312224

申请日：2023-05-04

申请人： TENCENT AMERICA LLC

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

IPC分类号： G06T9/00 ,  G06T17/20

CPC分类号： G06T9/001 ,  G06T17/20

摘要： A method of encoding includes receiving a polygon mesh comprising a plurality of original vertices. The method further includes deriving an initial base mesh from the polygon mesh, the initial base mesh including a first set of base mesh vertices. The method further includes performing a symmetrize process on the initial base mesh to generate a symmetrical base mesh that includes a first side having the first set of base mesh vertices and a second side having a second set of base mesh vertices, each base mesh vertex in the first set of base mesh vertices having a corresponding symmetric vertex in the second set of base mesh vertices. The method further includes determining a first displacement between each original vertex in the polygon mesh located on the second side of the symmetrical base mesh and a nearest vertex included in the second set of base mesh vertices.