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    Method and apparatus for deriving rice parameter in video/image coding system
    91.
    发明授权
    Method and apparatus for deriving rice parameter in video/image coding system 有权

    公开(公告)号：US12041247B2

    公开(公告)日：2024-07-16

    申请号：US17637290

    申请日：2020-08-20

    Applicant: LG ELECTRONICS INC.

    Inventor： Jungah Choi ,  Jin Heo ,  Sunmi Yoo ,  Jangwon Choi ,  Jaehyun Lim ,  Seunghwan Kim

    IPC: H04N19/18 ,  H04N19/132 ,  H04N19/176 ,  H04N19/70

    CPC classification number: H04N19/18 ,  H04N19/132 ,  H04N19/176 ,  H04N19/70

    Abstract: A video decoding method performed by a decoding apparatus comprises the steps of: acquiring, from a bitstream, residual information for a current transform block, wherein the residual information includes at least one of information indicating a level value of a target transform coefficient within the current transform block or information indicating a residual level value; based on a neighboring transform coefficient of the target transform coefficient, deriving a rice parameter for at least one of the information indicating the level value of the target transform coefficient or the information indicating the residual level value; based on the rice parameter, deriving a bin string for at least one of the information indicating the level value of the target transform coefficient or the information indicating the residual level value; and based on the bin string, deriving the level value of the target transform coefficient.

    INTRA PREDICTION-BASED IMAGE CODING METHOD AND DEVICE USING MPM LIST
    92.
    发明公开
    INTRA PREDICTION-BASED IMAGE CODING METHOD AND DEVICE USING MPM LIST 审中-公开

    公开(公告)号：US20240137501A1

    公开(公告)日：2024-04-25

    申请号：US18377577

    申请日：2023-10-05

    Applicant: LG Electronics Inc.

    Inventor： Jin HEO ,  Sunmi Yoo ,  Ling Li ,  Jangwon Choi ,  Jungah Choi

    IPC: H04N19/11 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/593

    CPC classification number: H04N19/11 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/593

    Abstract: An image decoding method according to the present document derives a left mode, which is a candidate intra prediction mode for a left peripheral block of a current block, derives an upper mode, which is a candidate intra prediction mode for an upper peripheral block of the current block, constructs an MPM list on the basis of the left mode and the upper mode, derives an intra prediction mode of the current block on the basis of the MPM list, generates prediction samples of the current block on the basis of the intra prediction mode, generates a restoration picture of the current block on the basis of the prediction samples, and derives the left mode or the upper mode as one from among candidate intra prediction modes of the MPM list, on the basis of when the left mode and the upper mode are not the same and the left mode and the upper mode are respectively a planar mode and a DC mode.

    Intra prediction-based image coding method and apparatus using unified MPM list
    97.
    发明授权
    Intra prediction-based image coding method and apparatus using unified MPM list 有权

    公开(公告)号：US11902572B2

    公开(公告)日：2024-02-13

    申请号：US17431348

    申请日：2020-02-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Jin Heo ,  Sunmi Yoo ,  Ling Li ,  Jangwon Choi ,  Jungah Choi

    IPC: H04N7/12 ,  H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/132 ,  H04N19/176

    CPC classification number: H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/132 ,  H04N19/176

    Abstract: An image decoding method according to the present document comprises the steps of: acquiring, from a bitstream, reference line index information indicating a reference line to be used for intra prediction of a current block; constructing a most probable mode (MPM) list by deriving candidate intra prediction modes of the current block on the basis of the value of the reference line index information; deriving the intra prediction mode of the current block on the basis of the MPM list; generating prediction samples for the current block on the basis of the intra prediction mode; and generating restoration samples for the current block on the basis of the prediction samples, wherein, on the basis of the case in which the value of the reference line index information is not zero, one of the candidate intra prediction modes is a DC mode and the number of candidate intra prediction modes including the DC mode is 5.

    CCLM-based intra-prediction method and apparatus therefor
    99.
    发明授权
    CCLM-based intra-prediction method and apparatus therefor 有权

    公开(公告)号：US11805244B2

    公开(公告)日：2023-10-31

    申请号：US17834532

    申请日：2022-06-07

    Applicant: LG ELECTRONICS INC.

    Inventor： Jangwon Choi ,  Jin Heo ,  Sunmi Yoo ,  Ling Li

    IPC: H04N19/00 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

    CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

    Abstract: A picture decoding method, performed by a decoding apparatus according to the present disclosure, comprises the steps of: when an intra-prediction mode of a chroma block is a cross-component linear model (CCLM) mode, deriving neighboring chroma reference samples with respect to the chroma block; deriving neighboring luma reference samples of a luma block corresponding to the chroma block and luma samples in the luma block; deriving down-sampled neighboring luma reference samples and downsampled luma samples by down sampling the neighboring luma reference samples and the luma samples, respectively; deriving a linear model parameter on the basis of the down-sampled neighboring luma reference samples and the neighboring chroma reference samples; generating prediction samples with respect to the chroma block on the basis of the linear model parameter and the down-sampled luma samples of the luma block; and reconstructing the chroma block on the basis of the prediction samples with respect to the chroma block.

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