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    Image decoding method and apparatus according to block division structure in image coding system
    71.
    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
    75.
    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
    76.
    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.

    Inter-prediction method and device based on DMVR and BDOF
    78.
    发明授权
    Inter-prediction method and device based on DMVR and BDOF 有权

    公开(公告)号：US11496743B2

    公开(公告)日：2022-11-08

    申请号：US17472170

    申请日：2021-09-10

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/105 ,  H04N19/137 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method includes: deriving a refined L0 motion vector and a refined L1 motion vector by applying decoder-side motion vector refinement (DMVR) based on an L0 motion vector and an L1 motion vector of a current block, deriving prediction samples for the current block based on L0 prediction samples derived based on the refined L0 motion vector and L1 prediction samples derived based on the refined L1 motion vector, and generating reconstructed samples for the current block based on the prediction samples. The L0 prediction samples are derived based on an L0 reference picture and the refined L0 motion vector, and the L1 prediction samples are derived based on an L1 reference picture and the refined L1 motion vector, and deriving the prediction samples comprises determining whether to apply bi-directional optical flow (BDOF) process based on a first POC difference and a second POC difference are the same.

    BDOF-based inter prediction method and device
    79.
    发明授权
    BDOF-based inter prediction method and device 有权

    公开(公告)号：US11477457B2

    公开(公告)日：2022-10-18

    申请号：US17476074

    申请日：2021-09-15

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/176 ,  H04N19/159 ,  H04N19/105 ,  H04N19/186 ,  H04N19/137 ,  H04N19/132 ,  H04N19/46

    Abstract: An image decoding method includes: deriving an L0 motion vector and a L1 motion vector of the current block; deriving prediction samples of the current block based on the L0 motion vector and the L1 motion vector; and generating reconstructed samples of the current block based on the prediction samples. Deriving the prediction samples includes applying bi-directional optical flow (BDOF) to the current block based on whether the condition for applying BDOF to the current block is satisfied, and the application condition of the BDOF includes a condition whereby the values of L0 luma weighted prediction flag information and L1 luma weighted prediction flag information are both zero, where the a value of each of the L0 luma weighted prediction flag information and L1 luma weighted prediction flag information being 0 represents that a weight factor for each of a L0 and L1 prediction luma components does not exist, respectively.

    DMVR-based inter prediction method and apparatus
    80.
    发明授权
    DMVR-based inter prediction method and apparatus 有权

    公开(公告)号：US11470328B2

    公开(公告)日：2022-10-11

    申请号：US17478605

    申请日：2021-09-17

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

    IPC: H04N19/513 ,  H04N19/577 ,  H04N19/105 ,  H04N19/159 ,  H04N19/137 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

    Abstract: A video decoding method comprises: deriving L0 and L1 motion vectors of a current block; deriving decoder-side motion vector refinement (DMVR) flag information indicating whether to apply a DMVR to the current block; when the DMVR flag information indicates that the DMVR is to be applied to the current block, deriving refined L0 and L1 motion vectors based on the L0 and L1 motion vectors by applying the DMVR to the current block; 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 predicted samples, wherein deriving DMVR flag information comprises deriving the DMVR flag information by applying the DMVR to the current block when the height of the current block is 8 or more, and when the values of L0 and L1 luma weighted prediction flag information are both 0.

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