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    EFFICIENT SIGNALING OF PICTURE SIZE AND PARTITIONING INFORMATION
    81.
    发明公开
    EFFICIENT SIGNALING OF PICTURE SIZE AND PARTITIONING INFORMATION 审中-公开

    公开(公告)号：US20230300361A1

    公开(公告)日：2023-09-21

    申请号：US18324573

    申请日：2023-05-26

    Applicant: TENCENT AMERICA LLC

    Inventor： Byeongdoo CHOI ,  Stephan WENGER ,  Shan LIU

    IPC: H04N19/46 ,  H04N19/122 ,  H04N19/119 ,  H04N19/136

    CPC classification number: H04N19/46 ,  H04N19/122 ,  H04N19/119 ,  H04N19/136

    Abstract: A method of efficient signalizing of picture size and partitioning information in a video bitstream, is performed by at least one processor and includes obtaining, from a sequence parameter set (SPS) to which a coded picture refers, a flag indicating whether the picture size and partitioning information of the coded picture is included in the SPS, and determining whether the obtained flag indicates that the picture size and partitioning information is included in the SPS. The method further includes based on the flag being determined to indicate that the picture size and partitioning information is included in the SPS, obtaining, from the SPS, the picture size and partitioning information, and based on the flag being determined to indicate that the picture size and partitioning information is not included in the SPS, obtaining, from a video parameter set (VPS), the picture size and partitioning information that is included in the VPS.

    ADAPTIVE CONTEXT-BASED ADAPTIVE BINARY ARITHMETIC CODING (CABAC) INITIAL STATE SELECTION FROM CODED PICTURES
    82.
    发明公开
    ADAPTIVE CONTEXT-BASED ADAPTIVE BINARY ARITHMETIC CODING (CABAC) INITIAL STATE SELECTION FROM CODED PICTURES 审中-公开

    公开(公告)号：US20230254489A1

    公开(公告)日：2023-08-10

    申请号：US17985809

    申请日：2022-11-11

    Applicant: Tencent America LLC

    Inventor： Xiaozhong XU ,  Shan LIU

    IPC: H04N19/13 ,  H04N19/91 ,  H04N19/105 ,  H04N19/169 ,  H04N19/172 ,  H04N19/70

    CPC classification number: H04N19/13 ,  H04N19/91 ,  H04N19/105 ,  H04N19/1883 ,  H04N19/172 ,  H04N19/70

    Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry that determines previous probability information associated with each entropy coded region of multiple regions in a previous picture. The processing circuitry selects, based on (i) a location or a quantization parameter of an independently decodable coding segment in a current picture or (ii) syntax information of the independently decodable coding segment, a region among the multiple regions. Initial probability information for one or more current syntax elements of a block in the independently decodable coding segment is determined based on the previous probability information associated with the selected region. The one or more current syntax elements are first to be entropy decoded in the independently decodable coding segment. The processing circuitry entropy decodes coded bits associated with the one or more current syntax elements into a bin string based on the initial probability information.

    METHODS, DEVICES, AND STORAGE MEDIUM FOR MULTI-SYMBOL ARITHMETIC CODING
    83.
    发明公开
    METHODS, DEVICES, AND STORAGE MEDIUM FOR MULTI-SYMBOL ARITHMETIC CODING 审中-公开

    公开(公告)号：US20230247206A1

    公开(公告)日：2023-08-03

    申请号：US17869964

    申请日：2022-07-21

    Applicant: Tencent America LLC

    Inventor： Madhu PERINGASSERY KRISHNAN ,  Xin ZHAO ,  Shan LIU

    IPC: H04N19/149 ,  H04N19/172 ,  H04N19/46 ,  H04N19/70

    CPC classification number: H04N19/149 ,  H04N19/172 ,  H04N19/46 ,  H04N19/70

    Abstract: Methods, apparatus, and computer readable storage medium for multi-symbol arithmetic coding in video decoding. The method includes receiving a coded video bitstream; obtaining an array of cumulative distribution functions and corresponding M symbols, wherein M is an integer larger than 1; and performing, based on the array of cumulative distribution functions, arithmetic decoding on the coded video bitstream to extract at least one symbol by: for each extracted symbol, updating the array of cumulative distribution functions according to the extracted symbol based on at least one probability update rate, and continuing, based on the updated array of cumulative distribution functions, arithmetic decoding on the coded video bitstream to extract next symbol.

    MESH COMPRESSION WITH DEDUCED TEXTURE COORDINATES
    86.
    发明公开
    MESH COMPRESSION WITH DEDUCED TEXTURE COORDINATES 审中-公开

    公开(公告)号：US20230222697A1

    公开(公告)日：2023-07-13

    申请号：US17969570

    申请日：2022-10-19

    Applicant: Tencent America LLC

    Inventor： Chao HUANG ,  Xiang ZHANG ,  Jun TIAN ,  Xiaozhong XU ,  Shan LIU

    IPC: G06T9/00 ,  G06V10/44 ,  G06V10/24

    CPC classification number: G06T9/001 ,  G06V10/24 ,  G06V10/457

    Abstract: Aspects of the disclosure provide methods and apparatuses for mesh coding (encoding and/or decoding). In some examples, an apparatus for coding mesh includes processing circuitry. The processing circuitry decodes, three dimensional (3D) coordinates of vertices in a first 3D mesh frame and connectivity information of the vertices from a bitstream that carries the first 3D mesh frame. The first 3D mesh frame represents a surface of an object with polygons. The processing circuitry deduces texture coordinates associated with the vertices, and decodes a texture map for the first 3D mesh frame from the bitstream. The texture map includes first one or more 2D charts with 2D vertices having the texture coordinates. The processing circuitry reconstructs the first 3D mesh frame based on the 3D coordinates of the vertices, the connectivity information of the vertices, the texture map and the texture coordinates.

    Adaptive Block Vector Resolution in Video Coding
    88.
    发明公开
    Adaptive Block Vector Resolution in Video Coding 审中-公开

    公开(公告)号：US20230199197A1

    公开(公告)日：2023-06-22

    申请号：US18107941

    申请日：2023-02-09

    Applicant: TENCENT AMERICA LLC

    Inventor： Xiaozhong XU ,  Xiang LI ,  Shan LIU

    IPC: H04N19/156 ,  H04N19/176 ,  H04N19/115 ,  H04N19/44

    CPC classification number: H04N19/156 ,  H04N19/176 ,  H04N19/115 ,  H04N19/44

    Abstract: Aspects of the disclosure provide a method and an apparatus for video coding. In some examples, the apparatus includes processing circuitry for video encoding. The processing circuitry selects a resolution from a set of resolutions that includes a 1-integer-pel resolution and a 4-integer-pel resolution. A current block is encoded with an intra block copy mode based on the selected resolution. The processing circuitry determines a block vector of the current block. The processing circuitry determines a block vector difference of the current block based on the block vector and a block vector predictor of the current block. The block vector difference is in the selected resolution. The processing circuitry encodes prediction information indicating the selected resolution and the block vector difference.

    JOINT SIGNALING METHOD FOR MOTION VECTOR DIFFERENCE
    90.
    发明公开
    JOINT SIGNALING METHOD FOR MOTION VECTOR DIFFERENCE 审中-公开

    公开(公告)号：US20230156182A1

    公开(公告)日：2023-05-18

    申请号：US17700729

    申请日：2022-03-22

    Applicant: Tencent America LLC

    Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

    IPC: H04N19/105 ,  H04N19/139 ,  H04N19/513 ,  H04N19/176 ,  H04N19/70

    CPC classification number: H04N19/105 ,  H04N19/139 ,  H04N19/521 ,  H04N19/176 ,  H04N19/70

    Abstract: This disclosure relates encoding and decoding of motion vector difference for inter-predicting a video block. The method includes receiving a coded video bitstream; extracting, from the coded video bitstream, a flag indicating whether an inter-predication mode is a JOINT_NEWMV mode for a current block in a current frame, wherein the JOINT_NEWMV mode indicates that a first delta motion vector (MV) for a first reference frame from a reference list 0 and a second delta MV for a second reference frame from a reference list 1 are jointly signaled; in response to the flag indicating that the inter-predication mode is the JOINT_NEWMV mode: extracting a joint delta motion vector (MV) for the current block, and deriving the first delta MV and the second delta MV based on the joint delta MV; and decoding the current block based on the first delta MV and the second delta MV.

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