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    CHROMA INTRA MODE DERIVATION IN SCREEN CONTENT CODING
    63.
    发明申请
    CHROMA INTRA MODE DERIVATION IN SCREEN CONTENT CODING 有权

    公开(公告)号：US20220078410A1

    公开(公告)日：2022-03-10

    申请号：US17528288

    申请日：2021-11-17

    Applicant: Bytedance Inc.

    Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  H04N19/176

    Abstract: A method of video processing is described. The method includes deriving, for a current video block of a video that is a chroma block and coded in a chroma DM mode, an intra prediction mode for the current video block according to a rule related to a coding mode of the current video block; and performing a conversion between the current video block and a coded presentation of the video, wherein the rule specifies to derive the intra prediction mode based on an intra prediction direction of a corresponding luma block used to derive the chroma DM mode and coded using a block differential pulse code modulation representation of a quantized residual block corresponding to the current video block.

    SIGNALING IN TRANSFORM SKIP MODE
    67.
    发明申请
    SIGNALING IN TRANSFORM SKIP MODE 有权

    公开(公告)号：US20220030280A1

    公开(公告)日：2022-01-27

    申请号：US17494934

    申请日：2021-10-06

    Applicant: Bytedance Inc.

    Inventor： Weijia ZHU ,  Li ZHANG ,  Jizheng XU

    IPC: H04N19/70 ,  H04N19/132 ,  H04N19/96 ,  H04N19/159 ,  H04N19/176

    Abstract: Devices, systems and methods for coefficient coding in transform skip mode are described. An exemplary method for visual media processing includes: for encoding a current video block in a video region of a visual media data into a bitstream representation of the visual media data, identifying usage of a coding mode and/or an intra prediction mode and/or a set of allowable intra prediction modes; and upon identifying the usage, making a decision of whether to include or exclude, in the bitstream representation, a syntax element indicative of selectively applying a transform skip mode to the current video block, wherein, in the transform skip mode, a residual of a prediction error between the current video block and a reference video block is represented in the bitstream representation of the visual media data without applying a transformation.

    SUB-BLOCK TRANSFORM IN TRANSFORM SKIP MODE
    70.
    发明申请
    SUB-BLOCK TRANSFORM IN TRANSFORM SKIP MODE 有权

    公开(公告)号：US20220030240A1

    公开(公告)日：2022-01-27

    申请号：US17473366

    申请日：2021-09-13

    Applicant: Beijing Bytedance Network Technology Co., Ltd. ,  Bytedance Inc.

    Inventor： Hongbin LIU ,  Li ZHANG ,  Kai ZHANG ,  Jizheng XU ,  Weijia ZHU ,  Yue WANG

    IPC: H04N19/122 ,  H04N19/119 ,  H04N19/176 ,  H04N19/13 ,  H04N19/157 ,  H04N19/105 ,  H04N19/70

    Abstract: A method for video processing includes determining, based on a first indication, whether a sub-block residual coding scheme is applied to residual of a current video block in a transform skip mode, the sub-block residual coding scheme splitting the residual of the current video block into multiple sub-blocks and a subset of the multiple sub-blocks have non-zero coefficients; determining, based on a second indication, a specific split pattern to be applied to the residual of the current video block, in response to the sub-block residual coding scheme being applied to the residual of the current video block; deriving, based on a third indication, the subset of the multiple sub-blocks which have non-zero coefficients; and performing a conversion on the residue of the current video block based on the determined subset of sub-blocks having non-zero coefficients.

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