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    Method for transform-based image coding and apparatus therefor
    105.
    发明授权
    Method for transform-based image coding and apparatus therefor 有权

    公开(公告)号：US12212756B2

    公开(公告)日：2025-01-28

    申请号：US18360351

    申请日：2023-07-27

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Hyeongmoon Jang ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

    Abstract: A method for image decoding, according to the present document, may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; and determining an LFNST set including LFNST matrices on the basis of the updated intra prediction mode, wherein the updated intra prediction mode is derived as an intra prediction mode corresponding to a specific position in the luma block, and the specific position is set on the basis of a color format of the chroma block.

    Image coding method based on transform, and device therefor
    106.
    发明授权
    Image coding method based on transform, and device therefor 有权

    公开(公告)号：US12206856B2

    公开(公告)日：2025-01-21

    申请号：US17762634

    申请日：2020-09-23

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

    IPC: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60

    Abstract: An image decoding method according to the present document comprises the steps of: when an ISP is applied to a current block and the width or height of a sub-partition block is less than or equal to 2, applying LFNST to the transform coefficients to derive modified transform coefficients; deriving residual samples for the objective block on the basis of an inverse primary transform for the modified transform coefficients; and generating a reconstructed picture on the basis of the residual samples for the objective block, wherein when the sub-partition block is an N×2 block or a 2×N block, (M×2) or (2×M) number of modified transform coefficients are derived by applying an LFNST matrix to a predetermined number of transform coefficients in an upper left M×2 area or 2×M (M≤N) area of the sub-partition block.

    Method and device for processing video signal using reduced transform
    108.
    发明授权
    Method and device for processing video signal using reduced transform 有权

    公开(公告)号：US12177484B2

    公开(公告)日：2024-12-24

    申请号：US17428016

    申请日：2020-02-06

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Mehdi Salehifar ,  Jaehyun Lim

    IPC: H04N19/625 ,  H04N19/119 ,  H04N19/12 ,  H04N19/157 ,  H04N19/176

    Abstract: A method and device for processing a video signal using a reduced transform are provided. A method for decoding a video signal includes splitting a current block into a plurality of subblocks based on a first flag for a split direction of the current block, determining a subblock, to which a transform is applied, among the plurality of subblocks based on a second flag for a position of a transform target block, determining a transform target area in the subblock, and applying an inverse transform including a horizontal transform and a vertical transform to transform coefficients of the transform target area. The transform target area is determined based on a transform type applied to the subblock and a size of the subblock.

    METHOD AND DEVICE FOR DECODING IMAGE IN IMAGE CODING SYSTEM
    109.
    发明申请
    METHOD AND DEVICE FOR DECODING IMAGE IN IMAGE CODING SYSTEM 有权

    公开(公告)号：US20240422344A1

    公开(公告)日：2024-12-19

    申请号：US18818416

    申请日：2024-08-28

    Applicant: LG Electronics Inc.

    Inventor： Jungdong SEO ,  Jaehyun Lim

    IPC: H04N19/513 ,  H04N19/105 ,  H04N19/109 ,  H04N19/119 ,  H04N19/13 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/44 ,  H04N19/91

    Abstract: An image decoding method performed by a decoding device according to the present invention comprises the steps of: acquiring information on inter prediction of a target block through a bit stream; deriving motion information of the target block on the basis of the information on inter prediction; deriving a prediction sample by performing inter prediction for the target block on the basis of the motion information; generating a reconstruction block on the basis of the prediction sample; deriving modified motion information of the target block on the basis of the reconstruction block; and updating the motion information of the target block on the basis of the modified motion information. According to the present invention, modified motion information of the target block can be calculated, and the motion information of the target block can be updated on the basis of the modified motion information, so that the overall coding efficiency can be improved.

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