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    Intra prediction-based image coding method and apparatus using unified MPM list
    1.
    发明授权
    Intra prediction-based image coding method and apparatus using unified MPM list 有权

    公开(公告)号：US12273558B2

    公开(公告)日：2025-04-08

    申请号：US18391092

    申请日：2023-12-20

    Applicant: LG ELECTRONICS INC.

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

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

    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.

    Video or image coding method and device therefor
    7.
    发明授权
    Video or image coding method and device therefor 有权

    公开(公告)号：US12081775B2

    公开(公告)日：2024-09-03

    申请号：US17629981

    申请日：2020-08-26

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/176 ,  H04N19/12 ,  H04N19/132 ,  H04N19/70

    CPC classification number: H04N19/176 ,  H04N19/12 ,  H04N19/132 ,  H04N19/70

    Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: obtaining, through a bitstream, image information including a motion information candidate index and residual information; deriving motion information of a current block on the basis of the motion information candidate index; deriving a prediction sample on the basis of the motion information; deriving, on the basis of residual syntax elements for a current residual coefficient in the current block, the current residual coefficient; deriving a residual sample on the basis of the current residual coefficient; and deriving a reconstruction sample of the current block on the basis of the prediction sample and the residual sample.

    MPM list-based intra prediction method and device
    9.
    发明授权
    MPM list-based intra prediction method and device 有权

    公开(公告)号：US12047556B2

    公开(公告)日：2024-07-23

    申请号：US17431025

    申请日：2020-02-20

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    Abstract: A video decoding method according to the present document is characterized by comprising: obtaining Most Probable Mode (MPM) index information and reference line index information from a bitstream; compiling an MPM list including candidate intra prediction modes for the intra prediction of a current block; deriving an intra prediction mode for the current block from among the candidate intra prediction modes included in the MPM list on the basis of the MPM index information; generating prediction samples for the current block on the basis of the intra prediction mode; and generating reconstructed samples for the current block on the basis of the prediction samples, wherein the step for compiling the MPM list involves deriving a DC mode as one of the candidate intra prediction modes, and including the DC mode in the MPM list, the DC mode being derived on the basis of the value of reference line index information indicating a reference line used for the intra prediction of the current block not being zero.

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