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    Image coding method and device on basis of wide-angle intra prediction and transform
    21.
    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 processing method based on inter prediction mode, and device therefor
    22.
    发明授权
    Image processing method based on inter prediction mode, and device therefor 有权

    公开(公告)号：US11632565B2

    公开(公告)日：2023-04-18

    申请号：US17542775

    申请日：2021-12-06

    Applicant: LG ELECTRONICS INC.

    Inventor： Hyeongmoon Jang ,  Junghak Nam ,  Naeri Park

    IPC: H04N11/02 ,  H04N19/513 ,  H04N19/109 ,  H04N19/136 ,  H04N19/176 ,  H04N19/587 ,  H04N19/70

    Abstract: In the present disclosure, a method of decoding a video signal and a device therefor are disclosed. Specifically, a method of decoding an image based on an inter prediction mode includes deriving a motion vector of an available spatial neighboring block around a current block; deriving a collocated block of the current block based on the motion vector of the spatial neighboring block; deriving a motion vector in a sub-block unit in the current block based on a motion vector of the collocated block; and generating a prediction block of the current block using the motion vector derived in the sub-block unit, wherein the collocated block may be specified by the motion vector of the spatial neighboring block in one pre-defined reference picture.

    DMVR-based inter-prediction method and device
    23.
    发明授权
    DMVR-based inter-prediction method and device 有权

    公开(公告)号：US11627323B2

    公开(公告)日：2023-04-11

    申请号：US17410371

    申请日：2021-08-24

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam

    IPC: H04N19/00 ,  H04N19/139 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

    Abstract: An image decoding method comprises the steps of: determining whether or not an application condition of decoder-side motion vector refinement (DMVR) for applying motion vector refinement for a current block is satisfied; deriving a minimum sum of absolute differences (SAD) on the basis of L0 and L1 motion vectors of the current block if the application condition of the DMVR is satisfied; deriving refined L0 and L1 motion vectors of the current block based on the minimum SAD; deriving prediction samples of the current block based on the refined L0 and L1 motion vectors; and generating reconstructed samples of the current block based on the prediction samples. With respect to whether or not the application condition of the DMVR is satisfied, the application condition of the DMVR is determined to be satisfied if a prediction mode, in which inter-prediction and intra-prediction are combined, is not applied to the current block.

    Image decoding method and apparatus according to block division structure in image coding system
    24.
    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.

    Method and device for inter predicting on basis of DMVR
    28.
    发明授权
    Method and device for inter predicting on basis of DMVR 有权

    公开(公告)号：US11516490B2

    公开(公告)日：2022-11-29

    申请号：US17258659

    申请日：2019-07-15

    Applicant: LG ELECTRONICS INC.

    Inventor： Naeri Park ,  Junghak Nam

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/137 ,  H04N19/44 ,  H04N19/132 ,  H04N19/46

    Abstract: The picture decoding method by a decoding device, according to one embodiment of the present invention, comprises the steps of: deriving a motion vector for a neighboring merge candidate block from among neighboring merge candidate blocks of a current block, if a merge mode is applied to the current block, deriving a reference block in a reference picture indicated by the motion vector for the neighboring merge candidate block, deriving a refinement block having the minimal SAD with the current block, from among refinement candidate blocks within the search range of the reference block, if DMVR is applied to the current block, deriving prediction samples for the current block on the basis of a refinement motion vector for the derived refinement block, and generating restoration samples for the current block on the basis of the prediction samples.

    Signaling of information indicating transform kernel set in image coding
    29.
    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.

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