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    METHOD AND APPARATUS FOR PROCESSING IMAGE SIGNAL
    121.
    发明公开
    METHOD AND APPARATUS FOR PROCESSING IMAGE SIGNAL 审中-公开

    公开(公告)号：US20240114166A1

    公开(公告)日：2024-04-04

    申请号：US18520383

    申请日：2023-11-27

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/593 ,  H04N19/122 ,  H04N19/176

    CPC classification number: H04N19/593 ,  H04N19/122 ,  H04N19/176

    Abstract: Embodiments of the present disclosure provide a method and device for processing a video signal. A method for decoding an image signal according to an embodiment of the present disclosure comprises the steps of: determining a non-separable transform set index indicating a non-separable transform set used for a non-separable transform of a current block from among non-separable transform sets predefined on the basis of an intra-prediction mode of the current block; determining. as a non-separable transform matrix, a transform kernel indicated by a non-separable transform index for the current block from among transform kernels included in the non-separable transform set indicated by the non-separable transform set index; and applying the non-separable transform matrix to an upper left region which of the current block, which is determined according to the width and height of the current block, wherein each of the predefined non-separable transform sets includes two transform kernels.

    Coding of information about transform kernel set
    124.
    发明授权
    Coding of information about transform kernel set 有权

    公开(公告)号：US11909972B2

    公开(公告)日：2024-02-20

    申请号：US18092828

    申请日：2023-01-03

    Applicant: LG Electronics Inc.

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

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

    CPC classification number: 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.

    Image coding method based on transform, and device for same
    128.
    发明授权
    Image coding method based on transform, and device for same 有权

    公开(公告)号：US11765389B2

    公开(公告)日：2023-09-19

    申请号：US17985577

    申请日：2022-11-11

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/122 ,  H04N19/61 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    CPC classification number: H04N19/61 ,  H04N19/122 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    Abstract: An image decoding method according to the present document may include the steps of: deriving the position of the final significant coefficient in the current block and transform coefficients for the current block on the basis of residual information; determining whether the index of a sub-block including the final significant coefficient is 0 and whether the position of the final significant coefficient in the sub-block is greater than 0; determining whether a significant coefficient exists in a second area excluding a first area at the upper left end of the current block; and parsing an LFNST index from a bitstream when the position of the final significant coefficient is determined to be greater than 0 in the sub-block in which the index is 0, and the significant coefficient does not exist in the second area.

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