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    Image coding method and device for carrying out MRL-based intra prediction
    143.
    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.

    Method and apparatus for decoding image by using transform according to block size in image coding system
    145.
    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：US11647200B2

    公开(公告)日：2023-05-09

    申请号：US17514113

    申请日：2021-10-29

    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 prediction method and device for deriving chroma intra prediction mode
    146.
    发明授权
    Image prediction method and device for deriving chroma intra prediction mode 有权

    公开(公告)号：US11582482B2

    公开(公告)日：2023-02-14

    申请号：US17299630

    申请日：2019-11-27

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/593 ,  H04N19/105 ,  H04N19/11 ,  H04N19/186

    Abstract: An image decoding method according to the present document includes: a step for deriving a luma intra prediction mode; and a step for generating a chroma candidate mode list for a chroma block including a preset number of chroma intra candidates by using at least one among a DM, a planar mode, a DC mode, a vertical mode, a horizontal mode, and an up-right diagonal mode, which are derived from the luma intra prediction mode, wherein the DM is a prediction mode corresponding to a center (CR) position of the luma block, and the chroma intra candidates other than the DM can be derived through a duplicate check of the DM and a prediction mode corresponding to any one among the top left (TL), top right (TR), bottom left (BL), and bottom right (BR) of the luma block, the planar mode, the DC mode, the vertical mode, and the horizontal mode.

    Image decoding method and device thereof
    148.
    发明授权
    Image decoding method and device thereof 有权

    公开(公告)号：US11523134B2

    公开(公告)日：2022-12-06

    申请号：US17612186

    申请日：2020-05-22

    Applicant: LG ELECTRONICS INC.

    Inventor： Sunmi Yoo ,  Junghak Nam ,  Jungah Choi

    IPC: H04N19/70 ,  H04N19/176 ,  H04N19/593 ,  H04N19/159

    Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: acquiring a block-based delta pulse code modulation (BDPCM) flag for a current block; on the basis of the BDPCM flag indicating that BDPCM is applied to the current block, acquiring a BDPCM direction flag for the current block; and storing, as an intra-prediction mode of the current block, an intra-prediction mode of a prediction direction derived on the basis of the BDPCM direction flag.

    Image decoding method for residual data coding in image coding system, and apparatus therefor
    149.
    发明授权
    Image decoding method for residual data coding in image coding system, and apparatus therefor 有权

    公开(公告)号：US11490125B2

    公开(公告)日：2022-11-01

    申请号：US17673201

    申请日：2022-02-16

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/70 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46

    Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring syntax elements for a first transform coefficient through an n-th transform coefficient of a current block, wherein the syntax elements are syntax elements according to a first residual data coding structure of TSRC; and acquiring syntax elements for an n+1st transform coefficient through a last transform coefficient of the current block, wherein the syntax elements are syntax elements according to a second residual data coding structure of the TSRC, wherein the number of context-coded syntax elements for the first transform coefficient through the n-th transform coefficient is equal to the maximum number of context-coded bins of the current block, and the syntax elements according to the second residual data coding structure include coefficient level information and a sign flag for a transform coefficient.

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