公开(公告)号：US20240171749A1

公开(公告)日：2024-05-23

申请号：US18429159

申请日：2024-01-31

Applicant: LG ELECTRONICS INC.

Inventor： Nae Ri PARK ,  Seung Hwan Kim ,  Jung Hak Nam ,  Hyeong Moon Jang

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

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise deriving a prediction sample of a current block based on motion information of the current block, determining whether prediction refinement with optical flow (PROF) applies to the current block, deriving, based on that the PROF applies to the current block, a difference motion vector for each sample position in the current block, deriving a gradient for each sample position in the current block, deriving a PROF offset based on the difference motion vector and the gradient, and deriving a refined prediction sample for the current block based on the PROF offset.

公开(公告)号：US11818341B2

公开(公告)日：2023-11-14

申请号：US17914492

申请日：2021-03-17

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon Jang ,  Sangheon Lee

IPC: H04N19/00 ,  H04N19/117 ,  H04N19/80 ,  H04N19/46 ,  H04N19/186 ,  H04N19/132

CPC classification number: H04N19/117 ,  H04N19/132 ,  H04N19/186 ,  H04N19/46 ,  H04N19/80

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise obtaining a reconstructed picture, determining a target boundary of deblocking filtering in the reconstructed picture, determining a boundary strength for the target boundary, and applying deblocking filtering to the target boundary based on the boundary strength. Based on the target boundary being a transform block boundary and a color component of the reconstructed picture being a chroma component, the boundary strength may be determined based on whether joint CbCr residual coding is performed on at least one of two blocks adjacent to the target boundary, and the joint CbCr residual coding may correspond to encoding residual samples for a chroma Cb component and a chroma Cr component as a single transform block.

公开(公告)号：US11595642B2

公开(公告)日：2023-02-28

申请号：US17635185

申请日：2020-08-14

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon Jang ,  Jin Heo

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/11 ,  H04N19/132 ,  H04N19/167 ,  H04N19/186 ,  H04N19/593

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise identifying a current chroma block by splitting an image, identifying whether a matrix based intra prediction mode applies to a first luma sample position corresponding to the current chroma block, identifying whether a predetermined prediction mode applies to a second luma sample position corresponding to the current chroma block, based on the matrix based intra prediction mode doing not apply, and determining an intra prediction mode candidate of the current chroma block based on an intra prediction mode applying to a third luma sample position corresponding to the current chroma block, based on the predetermined prediction mode doing not apply.

公开(公告)号：US20220368891A1

公开(公告)日：2022-11-17

申请号：US17860547

申请日：2022-07-08

Applicant: LG ELECTRONICS INC.

Inventor： Nae Ri Park ,  Jung Hak Nam ,  Hyeong Moon Jang

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises constructing a merge candidate list for a current block based on a prediction mode of the current block, deriving motion information of the current block based on the merge candidate list, and generating a prediction block of the current block based on the motion information. Information on a maximum number of merge candidates included in the merge candidate list may be obtained through a sequence parameter set, and, based on the prediction mode being a subblock-based merge mode, the maximum number of merge candidates may be determined based on whether an affine mode is available for the current block.

公开(公告)号：US12256090B2

公开(公告)日：2025-03-18

申请号：US18649534

申请日：2024-04-29

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon Jang ,  Sunmi Yoo ,  Jung Hak Nam

IPC: H04N19/186 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/96

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise obtaining palette information and palette index prediction information of a current block from a bitstream, based on a palette mode applying for the current block, constructing a palette predictor for the current block based on the palette information and constructing a palette table for the current block based on the palette predictor, generating a palette index map for the current block based on the palette index prediction information, and decoding the current block based on the palette table and the palette index map, The palette predictor may be selectively updated based on a split structure of the current block.

公开(公告)号：US12132908B2

公开(公告)日：2024-10-29

申请号：US18232125

申请日：2023-08-09

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon Jang ,  Jin Heo ,  Jung Hak Nam ,  Jangwon Choi

IPC: H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

CPC classification number: H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure comprises determining whether to apply intra prediction to a current chroma block based on information on prediction of the current chroma block, deriving an intra prediction mode of the current chroma block based on an intra prediction mode of a corresponding luma block corresponding to the current chroma block and intra chroma prediction mode information of the current chroma block, when intra prediction applies to the current chroma block, and generating a prediction block of the current chroma block, by performing intra prediction based on the intra prediction mode of the current chroma block. When the intra prediction mode of the corresponding luma block is not present, the intra prediction mode of the current chroma block is derived based on a default intra prediction mode.

公开(公告)号：US20240298012A1

公开(公告)日：2024-09-05

申请号：US18649534

申请日：2024-04-29

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon Jang ,  Sunmi Yoo ,  Jung Hak Nam

IPC: H04N19/186 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/96

CPC classification number: H04N19/186 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/96

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise obtaining palette information and palette index prediction information of a current block from a bitstream, based on a palette mode applying for the current block, constructing a palette predictor for the current block based on the palette information and constructing a palette table for the current block based on the palette predictor, generating a palette index map for the current block based on the palette index prediction information, and decoding the current block based on the palette table and the palette index map, The palette predictor may be selectively updated based on a split structure of the current block.

公开(公告)号：US12052414B2

公开(公告)日：2024-07-30

申请号：US17762686

申请日：2020-09-23

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon Jang ,  Seung Hwan Kim

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus comprises obtaining quantization mode information for a current block from a bitstream, determining whether a quantization matrix for the current block is constructed from a reference quantization matrix, based on the quantization mode information, and constructing the quantization matrix for the current block, based on a result of determination. When the quantization matrix for the current block is constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on identification information of the reference quantization matrix. When the quantization matrix for the current block is not constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on a value of the quantization matrix obtained from the bitstream. When the current block is an intra-predicted chroma block, the quantization matrix for the current block may be constructed only when a size of the current block is greater than 2×2.

公开(公告)号：US12047582B2

公开(公告)日：2024-07-23

申请号：US17441625

申请日：2020-03-24

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon Jang

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

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method includes deriving a first motion vector predictor for a first prediction direction of a current block and a second motion vector predictor for a second prediction direction, deriving a first motion vector difference for the first prediction direction of the current block and a second motion vector difference for the second prediction direction using information on a motion vector difference, and deriving a motion vector for the first prediction direction of the current block using the first motion vector predictor and the first motion vector difference and deriving a motion vector for the second prediction direction of the current block using the second motion vector predictor and the second motion vector difference. Based on first information specifying whether to parse information on the second motion vector difference, whether second information specifying a method of deriving the second motion vector difference may be determined.

公开(公告)号：US11924419B2

公开(公告)日：2024-03-05

申请号：US17969175

申请日：2022-10-19

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon Jang

IPC: H04N19/117 ,  H04N19/119 ,  H04N19/176 ,  H04N19/86

CPC classification number: H04N19/117 ,  H04N19/119 ,  H04N19/176 ,  H04N19/86

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise deriving a reconstructed block for a current block, deriving a target boundary for the reconstructed block, determining a filter length of a deblocking filter to be applied for the target boundary, and applying the deblocking filter for the target boundary based on the determined filter length. The filter length may be determined based on at least one of a width or height of a transform block adjacent to the target boundary.