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.

公开(公告)号：US11778192B2

公开(公告)日：2023-10-03

申请号：US17848634

申请日：2022-06-24

Applicant: LG Electronics Inc.

Inventor： Jin Heo ,  Hyeong Moon Jang ,  Jangwon Choi

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

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

Abstract: An image encoding/decoding method and apparatus include features of generating a prediction block by performing intra prediction on a current block, determining whether to apply position dependent intra prediction combination (PDPC) to the prediction block, and generating a final prediction block of the current block, by applying PDPC to the prediction block based on the determination. The determining whether to apply PDPC to the prediction block may include determining whether a size of the current block satisfies a predetermined condition. Based on the size of the current block satisfying the predetermined condition, it may be determined to apply PDPC to the prediction block. Based on the size of the current block not satisfying the predetermined condition, a determination of a color component of the current block may be skipped and it may be determined not to apply PDPC to the prediction block.

公开(公告)号：US11770537B2

公开(公告)日：2023-09-26

申请号：US17474919

申请日：2021-09-14

Applicant: LG Electronics Inc.

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

IPC: H04N19/136 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176 ,  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：US11589053B2

公开(公告)日：2023-02-21

申请号：US17683203

申请日：2022-02-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/132 ,  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：US11539945B2

公开(公告)日：2022-12-27

申请号：US17579145

申请日：2022-01-19

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon Jang

IPC: 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.

公开(公告)号：US20220345694A1

公开(公告)日：2022-10-27

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 ,  H04N19/186 ,  H04N19/176 ,  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：US20220191472A1

公开(公告)日：2022-06-16

申请号：US17566455

申请日：2021-12-30

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/137 ,  H04N19/167 ,  H04N19/577

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 reconstructing an inter prediction mode of a current block, deriving an affine merge candidate based on neighboring blocks of the current block, based on the inter prediction mode of the current block being an affine merge mode, deriving motion information of the current block based on motion information of the affine merge candidate, generating a prediction block of the current block by performing inter prediction on the current block based on the motion information of the current block, and reconstructing the current block based on the prediction block. The motion information may comprise a weight index for bi-prediction.

公开(公告)号：US20250055976A1

公开(公告)日：2025-02-13

申请号：US18812579

申请日：2024-08-22

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/14 ,  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 comprises deriving a prediction mode of a current block, constructing a merge candidate list for the current block, based on the prediction mode of the current block being a triangle partition mode (TPM), deriving motion information of two partitions of the current block based on the merge candidate list and two merge indices of the current block signaled through a bitstream, generating a prediction block of the current block based on the motion information, storing motion information of the current block, and updating a history-based motion vector predictor (HMVP) buffer based on the motion information of the current block.