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    Image coding method and device on basis of wide-angle intra prediction and transform
    41.
    发明授权
    Image coding method and device on basis of wide-angle intra prediction and transform 有权

    公开(公告)号：US11641471B2

    公开(公告)日：2023-05-02

    申请号：US17610985

    申请日：2020-05-27

    Applicant: LG ELECTRONICS INC.

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

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

    Abstract: An image decoding method according to the present document comprises the steps of: obtaining intra prediction mode information and an LFNST index; deriving an intra prediction mode of a current block on the basis of intra prediction mode information; when wide-angle intra prediction is applied to the current block, deriving a modified intra prediction mode by means of intra prediction mode remapping; deciding an LFNST set comprising LFNST matrices on the basis of the modified intra prediction mode; selecting one of the LFNST matrices on the basis of the LFNST set and LFNST index; and deriving transform coefficients for the current block on the basis of the selected LFNST matrix.

    Image decoding method and apparatus according to block division structure in image coding system
    43.
    发明授权
    Image decoding method and apparatus according to block division structure in image coding system 有权

    公开(公告)号：US11627319B2

    公开(公告)日：2023-04-11

    申请号：US17552204

    申请日：2021-12-15

    Applicant: LG Electronics Inc.

    Inventor： Junghak Nam ,  Jaehyun Lim

    IPC: H04N11/02 ,  H04N19/119 ,  H04N19/105 ,  H04N19/176 ,  H04N19/51 ,  H04N19/91

    Abstract: Provided is a video decoding method performed by a decoding apparatus, which includes: obtaining split information for a target block from a bitstream; splitting the target block into a first sub-block and a second sub-block based on a split boundary indicated by the split information; deriving a first motion information candidate list for the first sub-block and a second motion information candidate list for the second sub-block based on the split information for the target block; performing inter prediction of the first sub-block based on the first motion information candidate list; and performing inter prediction of the second sub-block based on the second motion information candidate list, in which the first sub-block and the second sub-block are non-rectangular blocks, and the first motion information candidate list for the first sub-block is different from the second motion information candidate list for the second sub-block.

    Video coding method on basis of secondary transform, and device for same
    44.
    发明授权
    Video coding method on basis of secondary transform, and device for same 有权

    公开(公告)号：US11582486B2

    公开(公告)日：2023-02-14

    申请号：US17592768

    申请日：2022-02-04

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    Abstract: A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

    Transform-based image coding method, and apparatus therefor
    47.
    发明授权
    Transform-based image coding method, and apparatus therefor 有权

    公开(公告)号：US11516484B2

    公开(公告)日：2022-11-29

    申请号：US17707000

    申请日：2022-03-29

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/18 ,  H04N19/119 ,  H04N19/129 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70 ,  H04N19/96

    Abstract: An image decoding method according to the present document comprises: a residual coding step for parsing residual information received in a residual coding level and arranging transform coefficients for a current block according to a predetermined scanning order; a step for deriving residual samples by applying at least one of LFNST or MTS to the transform coefficients; and a step for generating a reconstructed picture on the basis of the residual samples, wherein the LFNST is performed on the basis of an LFNST index indicating an LFNST kernel, the MTS is performed on the basis of an MTS index indicating an MTS kernel, the LFNST index and the MTS index are signaled in a coding unit level, and the MTS index is signaled immediately after the signaling of the LFNST index.

    Signaling of information indicating transform kernel set in image coding
    48.
    发明授权
    Signaling of information indicating transform kernel set in image coding 有权

    公开(公告)号：US11503298B2

    公开(公告)日：2022-11-15

    申请号：US17555881

    申请日：2021-12-20

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/00 ,  H04N19/124 ,  H04N19/625 ,  H04N19/94 ,  H04N19/39

    Abstract: An image decoding method according to the present document comprises a step of generating residual samples of a current block on the basis of residual information, wherein the residual information comprises a multiple transform selection (MTS) index and information regarding transform coefficients, the residual samples are generated from transform coefficients according to the information regarding the transform coefficients by using a transform kernel set, the transform kernel set is determined by the MTS index from among transform kernel set candidates, at least one of bins of a bin string of the MTS index is derived on the basis of context coding, the context coding is performed based on a value of a context index with respect to the MTS index.

    Image coding method based on quadratic transform, and apparatus therefor
    49.
    发明授权
    Image coding method based on quadratic transform, and apparatus therefor 有权

    公开(公告)号：US11483589B2

    公开(公告)日：2022-10-25

    申请号：US17394734

    申请日：2021-08-05

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

    IPC: H04N11/02 ,  H04N19/61 ,  H04N19/119 ,  H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46

    Abstract: An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for non-separable quadratic transform; deriving transform coefficients by inversely quantizing the quantized transform coefficient; deriving corrected transform coefficients on the basis of a transform kernel matrix in a predetermined transform set indicated by the transform index; and deriving residual samples for the target block on the basis of inverse linear transform for the corrected transform coefficients, wherein when the target block is divided into a predetermined number of sub-blocks and is coded by intra prediction, the corrected transform coefficients are derived in units of the sub-blocks, and the transform index is received for the target block.

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