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    CCLM-based intra-prediction method and device
    51.
    发明授权
    CCLM-based intra-prediction method and device 有权

    公开(公告)号：US11973954B2

    公开(公告)日：2024-04-30

    申请号：US17739468

    申请日：2022-05-09

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196

    CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196

    Abstract: A method for decoding a picture based on a cross-component linear model (CCLM) mode includes deriving neighboring luma reference samples of a luma block, deriving down-sampled neighboring luma reference samples, deriving a linear model parameter based on the down-sampled neighboring luma reference samples and the neighboring chroma reference samples, where the neighboring luma reference samples includes top neighboring luma reference samples, and left neighboring luma reference samples, and where when the top boundary of the luma block overlaps with a boundary of a coding tree unit (CTU), the number of the top neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples among the neighboring luma reference samples is less than that of the left neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples.

    Method and apparatus for decoding image by using transform according to block size in image coding system
    53.
    发明授权
    Method and apparatus for decoding image by using transform according to block size in image coding system 有权

    公开(公告)号：US11949875B2

    公开(公告)日：2024-04-02

    申请号：US18127192

    申请日：2023-03-28

    Applicant: LG ELECTRONICS INC.

    Inventor： Sunmi Yoo ,  Jangwon Choi ,  Jin Heo

    IPC: H04N19/132 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

    CPC classification number: H04N19/132 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

    Abstract: A method for decoding an image by a decoding apparatus according to the present invention comprises the steps of: deriving predicted samples by performing prediction on a current block; determining whether the current block is to be divided, on the basis of a size and a maximum transform size of the current block; when the current block is determined to be divided, dividing the current block into transform blocks; deriving transform coefficients of the transform blocks; deriving residual samples by performing an inverse transform procedure for the transform coefficients; and generating a reconstructed picture on the basis of the residual samples and the predicted samples, wherein, when the size of the current block is larger than the maximum transform size, the current block is determined to be divided.

    Image decoding method for residual coding, and device therefor
    55.
    发明授权
    Image decoding method for residual coding, and device therefor 有权

    公开(公告)号：US11882296B2

    公开(公告)日：2024-01-23

    申请号：US17957986

    申请日：2022-09-30

    Applicant: LG Electronics Inc.

    Inventor： Jungah Choi ,  Sunmi Yoo ,  Junghak Nam ,  Jin Heo ,  Jangwon Choi ,  Seunghwan Kim

    IPC: H04N19/18 ,  H04N19/184 ,  H04N19/70

    CPC classification number: H04N19/18 ,  H04N19/184 ,  H04N19/70

    Abstract: An image decoding method carried out by a decoding device, according to the present document, comprises the steps of: acquiring a sign data hiding enable flag; acquiring a transform skip residual coding (TSRC) enable flag on the basis of the sign data hiding enable flag; acquiring residual information for a current block, on the basis of the TSRC enable flag; deriving a residual sample of the current block, on the basis of the residual information; and generating a reconstructed picture on the basis of the residual sample, wherein the sign data hiding enable flag is a flag indicating whether sign data hiding is enabled, the TSRC enable flag is a flag indicating whether TSRC is enabled, and the TSRC enable flag is acquired on the basis of the sign data hiding enable flag having a value of zero.

    Image coding method and device for carrying out MRL-based intra prediction
    60.
    发明授权
    Image coding method and device for carrying out MRL-based intra prediction 有权

    公开(公告)号：US11716461B2

    公开(公告)日：2023-08-01

    申请号：US17374274

    申请日：2021-07-13

    Applicant: LG Electronics Inc.

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

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

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

    Abstract: An image decoding method includes: configuring a MPM list including candidate intra prediction modes for a current block; deriving an intra prediction mode of the current block from the MPM list on the basis of MPM index information indicating an intra prediction mode, among the candidate intra prediction modes included in the MPM list, for the current block; generating prediction samples for the current block on the basis of the intra prediction mode; and generating a reconstructed picture for the current block on the basis of the prediction samples, wherein the step for configuring the MPM list comprises, on the basis of the case where the value of reference line index information, representing a reference line used for the intra prediction of the current block, is not zero, deriving a DC mode as one mode among the candidate intra prediction modes, and including same in the MPM list.

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