公开(公告)号：US20240022727A1

公开(公告)日：2024-01-18

申请号：US18368861

申请日：2023-09-15

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri Park ,  Seunghwan Kim

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

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

Abstract: According to the disclosure of the present document, when the inter prediction type of a current block indicates biprediction, weight index information for candidates in a merge candidate list or a sub-block merge candidate list can be derived, and thus coding efficiency can be increased.

公开(公告)号：US20240022713A1

公开(公告)日：2024-01-18

申请号：US18371733

申请日：2023-09-22

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

Abstract: A method by which a decoding device performs image decoding, according to the present document, comprises the steps of: deriving a reference block on the basis of a motion shift; determining whether a subblock temporal motion vector predictor (sbTMVP) candidate is available, on the basis of whether the reference block is a current picture referencing (CPR) block; deriving motion information about a current block on the basis of the sbTMVP candidate when the sbTMVP candidate is available; generating prediction samples on the basis of the motion information; and generating a restored picture on the basis of the prediction samples, wherein the sbTMVP candidate is determined to be unavailable with respect to the reference block which is the CPR block.

公开(公告)号：US20230319304A1

公开(公告)日：2023-10-05

申请号：US18205862

申请日：2023-06-05

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176

CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176

Abstract: An image decoding method performed by the decoding apparatus according to this document comprising deriving a temporary reference motion vector for a current block based on a reference candidate block of the current block, deriving a reference motion vector by compressing the temporary reference motion vector based on a shifting operation, deriving a motion vector for the current block based on the reference motion vector, deriving prediction samples for the current block based on the motion vector for the current block, and generating reconstructed samples for the current block based on the prediction samples for the current block, wherein a total number of bits of the binary code representing the reference motion vector is less than a total number of bits of the binary code representing the temporary reference motion vector.

公开(公告)号：US20230283801A1

公开(公告)日：2023-09-07

申请号：US18132225

申请日：2023-04-07

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/132 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/573

CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/132 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/573 ,  H04N19/70

Abstract: According to embodiments according to the present document, merge mode motion vector differences (MMVD) and symmetric motion vector differences (SMVD) may be performed on the basis of reference picture types and, in particular, short-term reference pictures may be used. Accordingly, prediction performance and coding efficiency in an inter prediction mode may be increased.

公开(公告)号：US20230254503A1

公开(公告)日：2023-08-10

申请号：US18115883

申请日：2023-03-01

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/119 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/52 ,  H04N19/105 ,  H04N19/109 ,  H04N19/119 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/70

Abstract: The present disclosure relates to an image decoding and encoding method which can efficiently perform inter-prediction by applying a regular merge mode to the current block on the basis of the case in which an MMVD mode, a merge sub-block mode, a CIIP mode, and a partitioning mode, in which prediction is performed by dividing the current block into two partitions, are not available for the current block.

公开(公告)号：US20230239479A1

公开(公告)日：2023-07-27

申请号：US18128400

申请日：2023-03-30

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG

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

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

Abstract: Provided is an image decoding method performed by a decoding apparatus including deriving a temporary reference motion vector for a current block included in a current picture, deriving a reference motion vector for the current block by applying clipping to the temporary reference motion vector, deriving a motion vector for the current block based on the reference motion vector, deriving a predicted block for the current block based on the motion vector for the current block, and generating a reconstructed picture for the current picture based on the predicted block for the current block, wherein a number of bits of a binary code representing the reference motion vector is less than a number of bits of a binary code representing the temporary reference motion vector.

公开(公告)号：US20230164357A1

公开(公告)日：2023-05-25

申请号：US18101335

申请日：2023-01-25

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/159 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186

CPC classification number: 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：US20230164307A1

公开(公告)日：2023-05-25

申请号：US18100267

申请日：2023-01-23

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

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

Abstract: According to the disclosure of the present document, when the inter prediction type of a current block indicates biprediction, weight index information for candidates in a merge candidate list or a sub-block merge candidate list can be induced or derived, and coding efficiency can be increased.

公开(公告)号：US20230028629A1

公开(公告)日：2023-01-26

申请号：US17943537

申请日：2022-09-13

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/137 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/105 ,  H04N19/159 ,  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：US20230022381A1

公开(公告)日：2023-01-26

申请号：US17950390

申请日：2022-09-22

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Junghak NAM

IPC: H04N19/513 ,  H04N19/587 ,  H04N19/176

Abstract: According to the disclosure of the present document, a subblock position for deriving a subblock unit motion vector in a subblock-based temporal motion vector prediction (sbTMVP) can be efficiently calculated, thereby enabling video/image coding efficiency to increase and a simplifying effect for hardware implementation to be obtained.