公开(公告)号：US11470320B2

公开(公告)日：2022-10-11

申请号：US17501885

申请日：2021-10-14

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises the steps of: deriving a quantized transform coefficient for a current block on the basis of BDPCM; deriving a transform coefficient by performing dequantization on the quantized transform coefficient; and deriving a residual sample on the basis of the transform coefficient, wherein, when the BDPCM is applied to the current block, inverse non-separable transform is not applied to the transform coefficient.

公开(公告)号：US11457208B2

公开(公告)日：2022-09-27

申请号：US17550812

申请日：2021-12-14

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

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：US11451820B2

公开(公告)日：2022-09-20

申请号：US17470899

申请日：2021-09-09

Applicant: LG Electronics Inc.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/52 ,  H04N19/70 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/577

Abstract: An image decoding method includes: acquiring, from a bitstream, luma weight L0 flag information indicating whether there is an L0 prediction-related weight factor and luma weight L1 flag information indicating whether there is an L1 prediction-related weight factor; determining to apply decoder-side motion vector refinement (DMVR) to an L0 motion vector and L1 motion vector for a current block, when the luma weight L0 flag information and the luma weight L1 flag information are both zero; when it has been determined to apply DMVR, deriving a refined L0 motion vector and a refined L1 motion vector by applying the DMVR to the current block; deriving prediction samples for the current block on the basis of L0 prediction using the refined L0 motion vector and L1 prediction using the refined L1 motion vector; and generating reconstruction samples for the current block on the basis of the prediction samples.

公开(公告)号：US11451786B2

公开(公告)日：2022-09-20

申请号：US17257795

申请日：2019-07-05

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam

IPC: H04N7/12 ,  H04N19/139 ,  H04N19/176 ,  H04N19/513

Abstract: Provided is an image decoding method performed by a decoding apparatus, which includes: decoding a first coding tree unit (CTU) in a current picture; storing motion information of the first CTU in a line buffer; and decoding a second CTU in the current picture by using the motion information of the first CTU stored in the line buffer, in which the first CTU is located around a left side of the second CTU or located around a top of the second CTU.

公开(公告)号：US11445213B2

公开(公告)日：2022-09-13

申请号：US17545927

申请日：2021-12-08

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Naeri Park ,  Junghak Nam

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/132 ,  H04N19/167 ,  H04N19/176

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

公开(公告)号：US11445209B2

公开(公告)日：2022-09-13

申请号：US17242646

申请日：2021-04-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/513 ,  H04N19/115 ,  H04N19/176

Abstract: An image decoding method performed by a decoding apparatus, includes deriving a history-based motion vector prediction (HMVP) buffer for a current block based on a history, and deriving 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：US11431985B2

公开(公告)日：2022-08-30

申请号：US17475104

申请日：2021-09-14

Applicant: LG ELECTRONICS INC.

Inventor： Ling Li ,  Jaehyun Lim ,  Jin Heo ,  Junghak Nam

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/159 ,  H04N19/96 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device according to the present disclosure comprises the steps of: receiving a bitstream including prediction information for a current block; deriving a chroma array type for the current block on the basis of a separate color plane flag indicating whether three color components are separately coded and a chroma format index indicating a chroma format sampling structure for the current block, which are included in the prediction information for the current block; deriving prediction samples for the current block on the basis of the derived chroma array type; and deriving reconstructed samples for the current block on the basis of the prediction samples.

公开(公告)号：US11431967B2

公开(公告)日：2022-08-30

申请号：US17561446

申请日：2021-12-23

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Hyeongmoon Jang

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/196

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

公开(公告)号：US11381829B2

公开(公告)日：2022-07-05

申请号：US16325091

申请日：2016-08-19

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim

IPC: H04N19/44 ,  H04N19/137 ,  H04N19/119 ,  H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method may include: deriving motion information of a first prediction unit determined by a first partitioning mode of a current block and motion information of a second prediction unit determined by a second partitioning mode of the current block; generating a prediction block of the first prediction unit by using the motion information of the first prediction unit and generating a prediction block of the second prediction unit by using the motion information of the second prediction unit; and generating a prediction block of the current block in units of sub-prediction unit determined by combining the first prediction unit and the second prediction unit by using the first prediction block and the second prediction block.

公开(公告)号：US20220116651A1

公开(公告)日：2022-04-14

申请号：US17559417

申请日：2021-12-22

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak Nam ,  Hyeongmoon Jang

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

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.