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    ADAPTIVE MOTION VECTOR FOR WARPED MOTION MODE OF VIDEO CODING
    61.
    发明公开
    ADAPTIVE MOTION VECTOR FOR WARPED MOTION MODE OF VIDEO CODING 审中-公开

    公开(公告)号：US20240031596A1

    公开(公告)日：2024-01-25

    申请号：US18195888

    申请日：2023-05-10

    Applicant: Tencent America LLC

    Inventor： Liang ZHAO ,  Han GAO ,  Xin ZHAO ,  Shan LIU

    IPC: H04N19/52 ,  H04N19/176 ,  H04N19/70 ,  H04N19/159

    CPC classification number: H04N19/52 ,  H04N19/176 ,  H04N19/70 ,  H04N19/159

    Abstract: The various implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving a video bitstream including a current coding block in a current image frame, obtaining a syntax element value, and determining whether the current coding block is coded with a warped motion mode or a translational motion mode based on the syntax element value. The method further includes in accordance with a determination that the current coding block is coded with the warped motion mode, selecting a first motion vector difference (MVD) setting for the current coding block; in accordance with a determination that the current coding block is coded with the translational motion mode, selecting a second MVD setting distinct from the second MVD setting for the current coding block; and reconstructing the current coding block based at least in part on the selected MVD setting for the current coding block.

    METHOD AND APPARATUS FOR INTER PREDICTION MODE DEPENDENT SCALING FACTORS
    62.
    发明公开
    METHOD AND APPARATUS FOR INTER PREDICTION MODE DEPENDENT SCALING FACTORS 审中-公开

    公开(公告)号：US20240031594A1

    公开(公告)日：2024-01-25

    申请号：US17982946

    申请日：2022-11-08

    Applicant: TENCENT AMERICA LLC

    Inventor： Liang ZHAO ,  Xin ZHAO ,  Han GAO ,  Shan LIU

    IPC: H04N19/52 ,  H04N19/172 ,  H04N19/176 ,  H04N19/139 ,  H04N19/30 ,  H04N19/46

    CPC classification number: H04N19/52 ,  H04N19/172 ,  H04N19/176 ,  H04N19/139 ,  H04N19/30 ,  H04N19/46

    Abstract: A method performed by a video decoder includes receiving a coded video bitstream including a current picture, a first reference picture, a second reference picture, and a joint motion vector difference (JMVD) associated with at least one block in the current picture. The method includes determining whether one or more scaling factors are used for an adaptive motion vector difference resolution (AMVD) based JMVD based on a predetermined condition. The method includes, in response to determining the one or more scaling factors are used for the AMVD based JMVD, scaling the JMVD based on the one or more scaling factors. The method includes deriving a first MVD for the first reference picture based on the scaled JMVD. The method includes deriving a second MVD for the second reference picture based on the derived first MVD. The method includes reconstructing the at least one block based on the derived first MVD and the derived second MVD.

    DECODER-SIDE MOTION VECTOR REFINEMENT AND BI-DIRECTIONAL OPTICAL FLOW IN SUBBLOCK-BASED TEMPORAL MOTION VECTOR PREDICTION (SBTMVP)
    63.
    发明公开
    DECODER-SIDE MOTION VECTOR REFINEMENT AND BI-DIRECTIONAL OPTICAL FLOW IN SUBBLOCK-BASED TEMPORAL MOTION VECTOR PREDICTION (SBTMVP) 审中-公开

    公开(公告)号：US20240031578A1

    公开(公告)日：2024-01-25

    申请号：US17984948

    申请日：2022-11-10

    Applicant: Tencent America LLC

    Inventor： Lien-Fei CHEN ,  Guichun LI ,  Xin ZHAO ,  Shan LIU

    IPC: H04N19/137 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    CPC classification number: H04N19/137 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry that obtaining prediction information indicating whether a current block is coded in a subblock-based temporal motion vector prediction (SbTMVP) mode. If the current block is coded in the SbTMVP mode, whether a subblock in a plurality of subblocks of the current block is bi-predicted is determined. If the subblock is bi-predicted, motion information of the subblock is determined based on the SbTMVP mode. At least one of (i) a bilateral matching (BM)-based motion vector (MV) refinement and (ii) a bi-directional optical flow (BDOF) mode is applied to the subblock to refine the motion information of the subblock. The current block is reconstructed based on refined motion information corresponding to one or more subblocks in the plurality of subblocks. The refined motion information corresponding to the one or more subblocks includes the refined motion information of the subblock.

    LOCAL WARP MOTION DELTA MODE
    64.
    发明公开
    LOCAL WARP MOTION DELTA MODE 审中-公开

    公开(公告)号：US20240022756A1

    公开(公告)日：2024-01-18

    申请号：US17980125

    申请日：2022-11-03

    Applicant: TENCENT AMERICA LLC

    Inventor： Han GAO ,  Xin ZHAO ,  Liang ZHAO ,  Shan LIU

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

    CPC classification number: H04N19/513 ,  H04N19/70 ,  H04N19/176

    Abstract: An approach for encoding/decoding video data, performed by at least one processor, may include: obtaining a coded video bitstream; obtaining a plurality of blocks from the video bitstream, wherein the plurality of blocks comprise a current block and one or more neighboring blocks; determining, based a syntax element in the video bitstream, that a warp delta mode is used to predict the current block; determining positions and motion vectors of the one or more neighboring blocks; generating a first warp model of the current block based on motion vectors of the one or more neighboring blocks; selecting a warp model from among the first warp model of the current block and a second warp model associated with one of the one or more neighboring blocks as a base model of a coding mode; and decoding the plurality of blocks in the coding mode based on the base model.

    IBC CHROMA BLOCK VECTOR DERIVATION FROM LUMA BLOCK VECTORS
    65.
    发明公开
    IBC CHROMA BLOCK VECTOR DERIVATION FROM LUMA BLOCK VECTORS 审中-公开

    公开(公告)号：US20240022739A1

    公开(公告)日：2024-01-18

    申请号：US17983353

    申请日：2022-11-08

    Applicant: Tencent America LLC

    Inventor： Guichun LI ,  Xin ZHAO ,  Lien-Fei CHEN ,  Xiaozhong XU ,  Shan LIU

    IPC: H04N19/186 ,  H04N19/176 ,  H04N19/70

    CPC classification number: H04N19/186 ,  H04N19/176 ,  H04N19/70

    Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, processing circuitry receives a coded video bitstream including a current picture. The current picture includes a chroma block in a chroma separate tree, the chroma block being collocated in a same luma area with one or more luma blocks. The processing circuitry decodes, from the coded video bitstream, a syntax element that indicates a current picture referencing (CPR) mode for the chroma block, and determines, in response to the CPR mode, a chroma block vector for the chroma block according to one or more luma block vectors associated with the one or more luma blocks. The chroma block vector indicates a reference chroma block in the current picture. The processing circuitry reconstructs the chroma block based on the reference chroma block in the current picture.

    METHODS FOR SUB-BLOCK BASED TEMPORAL MOTION VECTOR PREDICTION
    70.
    发明公开
    METHODS FOR SUB-BLOCK BASED TEMPORAL MOTION VECTOR PREDICTION 审中-公开

    公开(公告)号：US20240007630A1

    公开(公告)日：2024-01-04

    申请号：US18470103

    申请日：2023-09-19

    Applicant: TENCENT AMERICA LLC

    Inventor： Xiaozhong XU ,  Xiang LI ,  Shan LIU

    IPC: H04N19/119 ,  H04N19/513 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/105

    CPC classification number: H04N19/119 ,  H04N19/521 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/105

    Abstract: A method of video decoding includes acquiring a current and identifying, for a current block included in the current picture, a reference block included in a reference picture that is different from the current picture, where the current block is divided into a plurality of sub-blocks (CBSBs), and the reference block has a plurality of sub-blocks (RBSBs). The method includes, determining whether the reference picture for the RBSB is the current picture, and in response to determining that the reference picture for the RBSB is the current picture, determining a coding mode of the RBSB as an intra mode. The method further includes, in response to determining that the reference picture for the RBSB is not the current picture determining a motion vector predictor for the one of the CBSBs based on whether the coding mode of the corresponding RBSB is one of the intra mode and the inter mode.

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