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    Method and apparatus for processing image signal
    502.
    发明授权
    Method and apparatus for processing image signal 有权

    公开(公告)号：US11563937B2

    公开(公告)日：2023-01-24

    申请号：US17476696

    申请日：2021-09-16

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/11 ,  H04N19/176 ,  H04N19/61

    Abstract: Embodiments of the present invention provide a method and apparatus for processing a video signal. A method for decoding an image signal according to an embodiment of the present invention comprises the steps of: for a current block having a width and a height different from each other, determining a modified intra prediction mode from an intra prediction mode, on the basis of a ratio between the width and the height of the current block and the intra prediction mode; determining an inverse non-separable transform set on the basis of the modified intra prediction mode; and applying an inverse non-separable transform matrix selected from the inverse non-separable transform set with respect to the top-left region of the current block, which is determined according to the width and the height of the current block.

    Transform for matrix-based intra-prediction in image coding
    503.
    发明授权
    Transform for matrix-based intra-prediction in image coding 有权

    公开(公告)号：US11558641B2

    公开(公告)日：2023-01-17

    申请号：US17503042

    申请日：2021-10-15

    Applicant: LG Electronics Inc.

    Inventor： Junghak Nam ,  Jaehyun Lim ,  Moonmo Koo ,  Seunghwan Kim

    IPC: H04N19/593 ,  H04N19/119 ,  H04N19/159 ,  H04N19/70 ,  H04N19/18 ,  H04N19/61 ,  H04N19/176

    Abstract: An image coding method according to the present document comprises the steps of: deriving transform coefficients for a current block on the basis of residual-related information; and generating residual samples of the current block on the basis of the transform coefficients. The residual-related information comprises low frequency non-separable transform (LFNST) index information, showing information relating to non-separable transform for low-frequency transform coefficients of the current block, on the basis of a matrix-based intra-prediction (MIP) flag showing whether or not MIP is applied to the current block. The residual samples are generated from the transform coefficients on the basis of the LFNST index information.

    Image coding method based on transform, and device therefor
    504.
    发明授权
    Image coding method based on transform, and device therefor 有权

    公开(公告)号：US11516511B2

    公开(公告)日：2022-11-29

    申请号：US17591431

    申请日：2022-02-02

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

    IPC: H04N19/60 ,  H04N19/12 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/172

    Abstract: An image decoding method according to the present document comprises a step of deriving a residual sample for a current block on the basis of a transform coefficient, wherein the step of deriving the transform coefficient can comprise the steps of: determining whether a sub block transform for performing a transform by dividing a coding unit is applied to the current block; determining whether a multiple transform selection (MTS), for which a plurality of transform kernels are used, is applied to the current block; and setting the size of a transform block to which the transform is to be applied, on the basis of whether the sub block transform is applied to the current block and whether the multiple transform selection is applied to the current block.

    Image decoding method for residual data coding in image coding system, and apparatus therefor
    505.
    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.

    Transform-based image coding method and device therefor
    506.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US11470324B2

    公开(公告)日：2022-10-11

    申请号：US17535090

    申请日：2021-11-24

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim

    IPC: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

    Abstract: An image decoding method, according to the present document, may comprise the steps of: deriving transform coefficients for a current block on the basis of residual information; determining whether a significant coefficient is present in a second region excluding a first region in the top-left end of the current block; parsing a LFNST index from a bitstream if the significant coefficient is not present in the second region; deriving modified transform coefficients by applying a LFNST matrix, derived on the basis of the LFNST index, to transform coefficients of the first region; and deriving residual samples of the current block on the basis of an inverse primary transform of the modified transform coefficients.

    Method and device for signaling information on chroma format
    510.
    发明授权
    Method and device for signaling information on chroma format 有权

    公开(公告)号：US11431985B2

    公开(公告)日：2022-08-30

    申请号：US17475104

    申请日：2021-09-14

    Applicant: LG ELECTRONICS INC.

    Inventor： Ling Li ,  Jaehyun Lim ,  Jin Heo ,  Junghak Nam

    IPC: H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/159 ,  H04N19/96 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

    Abstract: An image decoding method performed by a decoding device according to the present disclosure comprises the steps of: receiving a bitstream including prediction information for a current block; deriving a chroma array type for the current block on the basis of a separate color plane flag indicating whether three color components are separately coded and a chroma format index indicating a chroma format sampling structure for the current block, which are included in the prediction information for the current block; deriving prediction samples for the current block on the basis of the derived chroma array type; and deriving reconstructed samples for the current block on the basis of the prediction samples.

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