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    Video coding method on basis of secondary transform, and device for same
    82.
    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
    85.
    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.

    Method and device for signaling information related to slice in image/video encoding/decoding system
    86.
    发明授权
    Method and device for signaling information related to slice in image/video encoding/decoding system 有权

    公开(公告)号：US11509905B2

    公开(公告)日：2022-11-22

    申请号：US17826087

    申请日：2022-05-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Hendry Hendry ,  Seethal Paluri ,  Seunghwan Kim

    IPC: H04N19/132 ,  H04N19/70 ,  H04N19/174 ,  H04N19/176

    Abstract: A method by which a video decoding device decodes a video, according to the present document, can comprise the steps of: parsing, from a bitstream, number information related to the number of slices of which the height within a tile of a current picture is explicitly signaled; parsing, from the bitstream, on the basis of the number information, height information related to the height of the slices of which the height is explicitly signaled; deriving the number of slices in the tile on the basis of the number information and the height information; generating prediction samples by predicting the current block of the current picture on the basis of the slices within the tile; generating reconstructed samples on the basis of the prediction samples; and generating a reconstructed picture for the current picture on the basis of the reconstructed samples.

    Signaling of information indicating transform kernel set in image coding
    87.
    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.

    INTRA PREDICTION-BASED IMAGE CODING METHOD AND APPARATUS USING MPM LIST
    90.
    发明申请
    INTRA PREDICTION-BASED IMAGE CODING METHOD AND APPARATUS USING MPM LIST 有权

    公开(公告)号：US20220353496A1

    公开(公告)日：2022-11-03

    申请号：US17868888

    申请日：2022-07-20

    Applicant: LG ELECTRONICS INC.

    Inventor： Ling LI ,  Jin Heo ,  Seunghwan Kim

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    Abstract: A video decoding method according to this document includes deriving a first candidate intra prediction mode based on a first neighboring block located on a left side of a current block, deriving a second candidate intra prediction mode based on a second neighboring block located on an upper side of the current block, constructing a most probable mode (MPM) list for the current block based on the first candidate intra prediction mode and the second candidate intra prediction mode, deriving an intra prediction mode for the current block based on the MPM list, generating predicted samples by performing prediction for the current block based on the intra prediction mode, and generating a reconstructed picture for the current block based on the predicted samples.

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