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    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE
    61.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE 有权

    公开(公告)号：US20220417518A1

    公开(公告)日：2022-12-29

    申请号：US17762150

    申请日：2020-09-21

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

    IPC: H04N19/132 ,  H04N19/119 ,  H04N19/18 ,  H04N19/176

    Abstract: An image decoding method includes a step of deriving a residual sample, wherein the step of deriving the residual sample includes the steps of: when a current block is divided into sub-partition blocks, deriving a transform kernel for an inverse primary transform applied to a sub-partition block based on a horizontal or a vertical length of the sub-partition block; and deriving the residual sample from transform coefficients based on the transform kernel.

    TRANSFORMATION-BASED IMAGE CODING METHOD AND DEVICE THEREFOR
    63.
    发明申请
    TRANSFORMATION-BASED IMAGE CODING METHOD AND DEVICE THEREFOR 有权

    公开(公告)号：US20220400266A1

    公开(公告)日：2022-12-15

    申请号：US17775693

    申请日：2020-11-09

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Seunghwan KIM ,  Mehdi SALEHIFAR ,  Jaehyun LIM

    IPC: H04N19/132 ,  H04N19/186 ,  H04N19/18 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method according to the present document comprises the steps of: determining whether or not an effective coefficient is present in a second area not including an upper-left first area of a current block; parsing an MTS index from a bitstream on the basis that the effective coefficient is not present in the second area; and deriving residual samples for the current block by applying a transform kernel, which is derived on the basis of the MTS index, to transform coefficients in the first area, wherein the MTS index can be parsed on the basis that the effective coefficient, which is present in a scan sub-block which is scanned for the effective coefficient, is not present in the second area.

    TRANSFORM-BASED IMAGE CODING METHOD, AND DEVICE FOR SAME
    64.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD, AND DEVICE FOR SAME 有权

    公开(公告)号：US20220345713A1

    公开(公告)日：2022-10-27

    申请号：US17854540

    申请日：2022-06-30

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

    IPC: H04N19/132 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method according to the present document may comprise the steps of: receiving flag information, which indicates whether a scaling list is available while an LFNST is being performed, and an LFNST index and residual information for the current block; determining, on the basis of the flag information, the LFNST index, and the tree type of the current block, whether the scaling list is applicable to the current block; deriving transform coefficients for the current block from the residual information on the basis of the determination result; and applying the LFNST to the transform coefficients to derive corrected transform coefficients.

    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR
    65.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR 有权

    公开(公告)号：US20220248018A1

    公开(公告)日：2022-08-04

    申请号：US17719925

    申请日：2022-04-13

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/12 ,  H04N19/132 ,  H04N19/159 ,  H04N19/61 ,  H04N19/70 ,  H04N19/96

    Abstract: An image decoding method according to the present document comprises a step for performing inverse first-order transform and inverse non-separable transform on a residual sample. The inverse non-separable transform is performed on the basis of a transform index indicating a predetermined transform kernel matrix, the inverse first-order transform is performed on the basis of a multiple transform selection (MTS) index indicating MTS for a horizontal transform kernel and a vertical transform kernel, and a syntax element bin string for the transform index is derived on the basis of first context information when a tree type for a split structure of a target block is not a single tree type and is derived on the basis of second context information when the tree type is the single tree type.

    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE
    67.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE 有权

    公开(公告)号：US20220124351A1

    公开(公告)日：2022-04-21

    申请号：US17562923

    申请日：2021-12-27

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

    IPC: H04N19/18 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/159 ,  H04N19/176 ,  H04N19/184 ,  H04N19/593 ,  H04N19/61 ,  H04N19/91

    Abstract: An image decoding method according to the present disclosure includes deriving transform coefficients through dequantization based on the quantized transform coefficients for the target block; deriving modified transform coefficients based on an inverse reduced secondary transform (RST) for the transform coefficients; deriving residual samples for the target block based on an inverse primary transform for the modified transform coefficients; and generating a reconstructed samples based on the residual samples, and prediction samples derived based on an intra prediction mode for the target block, wherein the inverse RST is performed based on a transform kernel matrix selected from a transform set including a plurality of transform kernel matrices, the transform set is determined based on a mapping relationship according to the intra prediction mode applied to the target block, and a plurality of intra prediction modes including the intra prediction mode of the target block are mapped to one transform set.

    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR
    68.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR 有权

    公开(公告)号：US20220086448A1

    公开(公告)日：2022-03-17

    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 ,  H04N19/18 ,  H04N19/176

    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.

    TRANSFORM IN INTRA PREDICTION-BASED IMAGE CODING
    69.
    发明申请
    TRANSFORM IN INTRA PREDICTION-BASED IMAGE CODING 有权

    公开(公告)号：US20220038744A1

    公开(公告)日：2022-02-03

    申请号：US17503788

    申请日：2021-10-18

    Applicant: LG ELECTRONICS INC.

    Inventor： Junghak NAM ,  Jaehyun LIM ,  Moonmo KOO ,  Seunghwan KIM

    IPC: H04N19/60 ,  H04N19/176 ,  H04N19/159 ,  H04N19/18 ,  H04N19/122

    Abstract: An image decoding method according to the present document comprises the steps of: acquiring prediction-related information and residual-related information for a current block; deriving transform coefficients for the current block on the basis of the residual-related information; and generating residual samples of the current block on the basis of the transform coefficients, wherein the residual-related information includes low-frequency non-separable transform (LFNST) index information indicating information relating to non-separable transform for a low-frequency transform coefficient of the current block on the basis of a matrix-based intra prediction (MIP) flag.

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