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    Method and apparatus for coding image on basis of transform
    141.
    发明授权
    Method and apparatus for coding image on basis of transform 有权

    公开(公告)号：US11611776B2

    公开(公告)日：2023-03-21

    申请号：US17572282

    申请日：2022-01-10

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/60 ,  H04N19/122 ,  H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    Abstract: An image decoding method according to the present document may comprise the steps of: deriving a first variable indicating whether there is a valid coefficient in a region excluding a DC region from a current block; deriving a second variable indicating whether there is a valid coefficient in a second region excluding a first region formed at the upper left end of the current block; when the first variable indicates that the valid coefficient exists in the region excluding the DC region, and the second variable indicates that the valid coefficient does not exist in the second region, parsing an LFNST index from the bitstream; and applying an LFNST matrix derived on the basis of the LFNST index to transform coefficients in the first region, to derive the modified transform coefficients.

    Image coding method on basis of transformation and device therefor
    142.
    发明授权
    Image coding method on basis of transformation and device therefor 有权

    公开(公告)号：US11601679B2

    公开(公告)日：2023-03-07

    申请号：US17507446

    申请日：2021-10-21

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/00 ,  H04N19/60 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    Abstract: An image decoding method performed by means of a decoding device according to the present invention comprises the steps of: deriving quantized transform coefficients with respect to a target block from a bitstream; performing inverse quantization with respect to the quantized transform coefficients with respect to the target block and deriving transform coefficients; deriving residual samples with respect to the target block on the basis of reduced inverse transform with respect to the transform coefficients; and generating a reconstructed picture on the basis of the residual samples with respect to the target block and prediction samples with respect to the target block. The reduced inverse transform is performed on the basis of a reduced inverse transform matrix. The reduced inverse transform matrix is a non-square matrix of which the number of columns is smaller than the number of rows.

    Transform-based image coding method and device therefor
    143.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US11595691B2

    公开(公告)日：2023-02-28

    申请号：US17727516

    申请日：2022-04-22

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/61 ,  H04N19/159 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186

    Abstract: An image decoding method according to the present document comprises the steps of: updating an intra-prediction mode of a chroma block on the basis of an intra-prediction mode of a luma block corresponding to the chroma block on the basis of the intra-prediction mode of the chroma block being a cross-component linear model (CCLM) mode; and determining a LFNST set including LFNST matrixes 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 updated intra-prediction mode is updated as an intra-DC mode on the basis of the intra-prediction mode, that corresponds to the specific position, being an intra-block copy (IBC) mode.

    Method for processing image and apparatus therefor
    144.
    发明授权
    Method for processing image and apparatus therefor 有权

    公开(公告)号：US11589064B2

    公开(公告)日：2023-02-21

    申请号：US17060598

    申请日：2020-10-01

    Applicant: LG ELECTRONICS INC.

    Inventor： Junghak Nam ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/44 ,  H04N19/132 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70 ,  H04N19/96

    Abstract: A video decoding method includes: when a current block satisfies a preconfigured condition, parsing a first syntax element indicating whether the current block is split into a plurality of sub-blocks; when the first syntax element indicates that the current block is split, parsing a second syntax element indicating whether the current block is split using a quad-tree structure; when the second syntax element indicates that the current block is not split using the quad-tree structure, parsing at least one of a third syntax element indicating whether the current block is split using a binary-tree structure or a ternary-tree structure and a fourth syntax element indicating a split direction of the current block; and determining a split mode of the current block based on at least one of the first syntax element, the second syntax element, the third syntax element and the fourth syntax element.

    Coding of information about transform kernel set
    147.
    发明授权
    Coding of information about transform kernel set 有权

    公开(公告)号：US11570438B2

    公开(公告)日：2023-01-31

    申请号：US17556099

    申请日：2021-12-20

    Applicant: LG Electronics Inc.

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

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

    Abstract: An image decoding method includes: acquiring a multiple transform selection (MTS) index and residual information from a bitstream; deriving transform coefficients for the current block on the basis of the residual information; and generating residual samples of the current block on the basis of the MTS index and the transform coefficients, wherein the MTS index indicates a transform kernel set to be applied to the current block among transform kernel set candidates, at least one bin among bins of a bin string of the MTS index is derived on the basis of context coding, the context coding is performed on the basis of values of increase and decrease in a context index pertaining to the MTS index, and a single value of increase and decrease in the context index can be used for the context coding of the first bin among the bins of the bin string.

    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR
    149.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR 有权

    公开(公告)号：US20220394257A1

    公开(公告)日：2022-12-08

    申请号：US17775818

    申请日：2020-11-13

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/12 ,  H04N19/176 ,  H04N19/96 ,  H04N19/70 ,  H04N19/186 ,  H04N19/61 ,  H04N19/167

    Abstract: An image decoding method according to the present document comprises the step of deriving modified transform coefficients by applying LFNST to transform coefficients, wherein the step of deriving the modified transform coefficients comprises the steps of: deriving a variable indicating whether an effective coefficient is present in a DC component of a current block; and parsing an LFNST index on the basis of whether the variable indicates that the effective coefficient is present in a position other than the DC component, wherein the variable may be derived on the basis of an individual transform skip flag value for a color component of the current block.

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