公开(公告)号：US11876972B2

公开(公告)日：2024-01-16

申请号：US17943537

申请日：2022-09-13

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

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  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.

公开(公告)号：US11838517B2

公开(公告)日：2023-12-05

申请号：US17899248

申请日：2022-08-30

Applicant: LG Electronics Inc.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/13 ,  H04N19/137 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  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.

公开(公告)号：US20230353791A1

公开(公告)日：2023-11-02

申请号：US18219012

申请日：2023-07-06

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/176 ,  H04N19/85

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/176 ,  H04N19/85

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: generating a restoration picture on the basis of prediction samples of a coding block; deriving a boundary strength (BS) for a boundary of the coding block in the restoration picture; performing deblocking filtering on the boundary of the coding block on the basis of the boundary strength; and deriving a modified restoration picture for the restoration picture on the basis of the deblocking filtering, wherein the boundary strength is derived on the basis of a prediction mode of a first block and a second block that are adjacent to the boundary of the coding block, and the prediction mode of the first block or the second block is derived on the basis of whether the prediction mode of the first block or the second block is a current picture referencing (CPR) mode to be coded in reference to a current picture.

公开(公告)号：US11729414B2

公开(公告)日：2023-08-15

申请号：US17863829

申请日：2022-07-13

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Seunghwan Kim ,  Junghak Nam ,  Jaehyun Lim ,  Hyeongmoon Jang

IPC: H04N19/513 ,  H04N19/115 ,  H04N19/176 ,  H04N19/105 ,  H04N19/132 ,  H04N19/137

CPC classification number: H04N19/513 ,  H04N19/105 ,  H04N19/115 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176

Abstract: According to an embodiment disclosed in the present document, it is possible to derive a history-based motion vector prediction (HMVP) buffer for a current block based on a history, and to derive motion information of the current block based on an HMVP candidate included in the HMVP buffer, thereby increasing inter prediction efficiency.

公开(公告)号：US11716465B2

公开(公告)日：2023-08-01

申请号：US17985467

申请日：2022-11-11

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Naeri Park ,  Seunghwan Kim

IPC: H04N19/105 ,  H04N19/119 ,  H04N19/132 ,  H04N19/176 ,  H04N19/50 ,  H04N19/70

CPC classification number: H04N19/105 ,  H04N19/119 ,  H04N19/132 ,  H04N19/176 ,  H04N19/50 ,  H04N19/70

Abstract: A decoding method performed by a decoding device, according to the present document, may comprise the steps of: acquiring a sequence parameter set from a bitstream; acquiring a combined inter-picture merge and intra-picture prediction (CIIP) enable flag from the sequence parameter set; determining, on the basis of the CIIP enable flag and the size of a current block, whether a regular merge flag is included in the bitstream; parsing the regular merge flag in the bitstream on the basis that a condition based on the CIIP enable flag and a condition based on the size of the current block are satisfied; generating prediction samples of the current block on the basis of the regular merge flag; and generating a restoration picture on the basis of the prediction samples.

公开(公告)号：US11632564B2

公开(公告)日：2023-04-18

申请号：US17065822

申请日：2020-10-08

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/513 ,  H04N19/44

Abstract: An image decoding method according to the present disclosure includes deriving a history-based motion vector prediction (HMVP) buffer for a current block, deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, generating prediction samples for the current block based on the motion information, and generating reconstructed samples based on the prediction samples, and the HMVP buffer is initialized when processing a first-ordered CTU in a CTU row in which a current CTU is located, and the current block is included in the current CTU.

公开(公告)号：US20230116282A1

公开(公告)日：2023-04-13

申请号：US18079660

申请日：2022-12-12

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Naeri Park ,  Junghak Nam

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

Abstract: According to the disclosure of this document, in subblock-based temporal motion vector prediction (sbTMVP), a subblock position for deriving a motion vector in units of a subblock can be efficiently calculated, and through this, video/image coding efficiency can be improved and hardware implementation can be simplified.

公开(公告)号：US20230077012A1

公开(公告)日：2023-03-09

申请号：US17979403

申请日：2022-11-02

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak Nam ,  Hyeongmoon Jang

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

Abstract: The present invention relates to a method for encoding and decoding images, wherein, if bi-prediction is applied, a weight for a merge candidate is derived, thereby improving the image compression efficiency, and making it possible to efficiently configure a motion vector candidate. A merge candidate list of the current block is produced on the basis of inter-prediction information, and the candidate includes a configured affine merge candidate. If the configured affine merge candidate is produced on the basis of a combination of control points including CP0, weight index information regarding the configured affine merge candidate is produced on the basis of weight index information regarding CP0. If the configured affine merge candidate is produced on the basis of a combination of control points excluding CP0, weight index information regarding the configured affine merge candidate is derived on the basis of weight index information regarding CP1.

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.

公开(公告)号：US11539941B2

公开(公告)日：2022-12-27

申请号：US17561642

申请日：2021-12-23

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

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

Abstract: The present invention relates to a method for encoding and decoding images, wherein, if bi-prediction is applied, a weight for a merge candidate is derived, thereby improving the image compression efficiency, and making it possible to efficiently configure a motion vector candidate. A merge candidate list of the current block is produced on the basis of inter-prediction information, and the candidate includes a configured affine merge candidate. If the configured affine merge candidate is produced on the basis of a combination of control points including CP0, weight index information regarding the configured affine merge candidate is produced on the basis of weight index information regarding CP0. If the configured affine merge candidate is produced on the basis of a combination of control points excluding CP0, weight index information regarding the configured affine merge candidate is derived on the basis of weight index information regarding CP1.