公开(公告)号：US20220150504A1

公开(公告)日：2022-05-12

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 ,  H04N19/18 ,  H04N19/176

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.

公开(公告)号：US20220141485A1

公开(公告)日：2022-05-05

申请号：US17431777

申请日：2020-03-04

Applicant: LG ELECTRONICS INC.

Inventor： Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/105 ,  H04N19/172 ,  H04N19/11 ,  H04N19/132 ,  H04N19/139 ,  H04N19/109 ,  H04N19/196 ,  H04N19/52

Abstract: According to the present disclosure of the present document, prediction can be performed on the basis of information related to the maximum number of block vector candidates included in a merge candidate list for the IBC merge mode, and thus information for IBC, which is distinguished from information used in inter prediction, can be signaled separately, and the efficiency of screen content coding (SCC) can be increased.

公开(公告)号：US20220116623A1

公开(公告)日：2022-04-14

申请号：US17561614

申请日：2021-12-23

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

Abstract: According to embodiments of the present document, a prediction procedure can be performed for image video coding, and the prediction procedure can comprise merge mode motion vector differences (MMVD) and symmetric motion vector differences (SMVD) according inter prediction. The inter prediction can be performed on the basis of reference pictures of a current picture, and types of the reference pictures (e.g. a long-term reference picture, a short-term reference picture, etc.) can be considered for the inter prediction. Accordingly, performance and coding efficiency in the prediction procedure can be increased.

公开(公告)号：US20220109828A1

公开(公告)日：2022-04-07

申请号：US17550812

申请日：2021-12-14

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

Abstract: An image decoding method according to the present document may comprise: a step for deriving an inter prediction mode from encoded information; a step for constructing reference pictures lists; a step for deriving motion information including reference picture indices for symmetric motion vector differences (SMVD) on the basis of reference pictures included in the reference picture lists; and a step for generating prediction samples on the basis of the motion information. The reference picture indices for SMVD may be derived on the basis of short-term reference pictures included in the reference picture lists.

公开(公告)号：US20220078455A1

公开(公告)日：2022-03-10

申请号：US17418122

申请日：2019-12-27

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jin HEO ,  Junghak NAM ,  Ling LI ,  Jangwon CHOI ,  Jungah CHOI ,  Seunghwan KIM

IPC: H04N19/40 ,  H04N19/13 ,  H04N19/129 ,  H04N19/132 ,  H04N19/88 ,  H04N19/176 ,  H04N19/18

Abstract: A video decoding method performed by a decoding device according to the present document comprises the steps of: entropy decoding residual information for a current block to derive residual coefficients for the current block; rearranging the residual coefficients; deriving residual samples of the current block on the basis of the rearranged residual coefficients; and restoring a current picture on the basis of the residual samples.

公开(公告)号：US20220078440A1

公开(公告)日：2022-03-10

申请号：US17478605

申请日：2021-09-17

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

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.

公开(公告)号：US20220078433A1

公开(公告)日：2022-03-10

申请号：US17424347

申请日：2020-06-17

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Junghak NAM ,  Jungah CHOI

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/70 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device according to the present document is characterized by including: a step for determining whether the width and height of the current block are smaller than or equal to a maximum transform block size; a step for acquiring a Block-based Delta Pulse Code Modulation (BDPCM) flag, which indicates whether to apply BDPCM to the current block, when the width and height are smaller than or equal to the maximum transform block size; a step for acquiring a BDPCM direction flag that indicates a prediction direction for the current block on the basis of the BDPCM flag; a step for deriving prediction samples of the current block on the basis of an intra-prediction mode derived on the basis of the BDPCM direction flag; and a step for deriving recovered samples of the current block on the basis of the prediction samples.

公开(公告)号：US20220078408A1

公开(公告)日：2022-03-10

申请号：US17420611

申请日：2020-01-02

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

Abstract: A video signal processing method comprises obtaining a merge subblock index for a current block for which a parameter for subblock-based inter prediction is derived from a surrounding block; obtaining control point motion vectors for control points of the current block, based on the merge subblock index, the merge subblock index being related to one candidate in a subblock-based merge candidate list; applying one or more offsets to the control point motion vectors, based on a merge with motion vector direction index for refining the control point motion vectors; determining a motion vector for each subblock based on the respective positions of the subblocks in the current block and the control point motion vectors to which the one or more offsets have been applied; and generating prediction samples for the current block based on a reference picture related to the subblock merge index and the motion vectors for each subblock.

公开(公告)号：US20220038741A1

公开(公告)日：2022-02-03

申请号：US17503042

申请日：2021-10-15

Applicant: LG Electronics Inc.

Inventor： Junghak NAM ,  Jaehyun LIM ,  Moonmo KOO ,  Seunghwan KIM

IPC: H04N19/593 ,  H04N19/119 ,  H04N19/159 ,  H04N19/18 ,  H04N19/70 ,  H04N19/176 ,  H04N19/61

Abstract: An image coding method according to the present document comprises the steps of: deriving transform coefficients for a current block on the basis of residual-related information; and generating residual samples of the current block on the basis of the transform coefficients. The residual-related information comprises low frequency non-separable transform (LFNST) index information, showing information relating to non-separable transform for low-frequency transform coefficients of the current block, on the basis of a matrix-based intra-prediction (MIP) flag showing whether or not MIP is applied to the current block. The residual samples are generated from the transform coefficients on the basis of the LFNST index information.

公开(公告)号：US20210400301A1

公开(公告)日：2021-12-23

申请号：US17466155

申请日：2021-09-03

Applicant: LG ELECTRONICS INC

Inventor： Jaeho LEE ,  Junghak NAM

IPC: H04N19/52 ,  H04N19/139 ,  H04N19/157 ,  H04N19/176

Abstract: A method for processing a video signal using an affine motion prediction is disclosed. The method includes checking that a current block is encoded by the affine motion prediction, obtaining motion vectors for a plurality of control points of the current block, determining a motion vector for each of a plurality of subblocks included in the current block based on the motion vectors for the plurality of control points, and performing a prediction for the current block from the motion vector for each of the plurality of subblocks, wherein each of the plurality of subblocks is configured to have a pre-defined width and a pre-defined height.