公开(公告)号：US20240073458A1

公开(公告)日：2024-02-29

申请号：US17766954

申请日：2020-10-06

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG ,  Seethal PALURI ,  Hendry HENDRY ,  Jung Hak NAM

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/174 ,  H04N19/176 ,  H04N19/46 ,  H04N19/86

CPC classification number: H04N19/82 ,  H04N19/117 ,  H04N19/174 ,  H04N19/176 ,  H04N19/46 ,  H04N19/86

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus comprises decoding a first flag specifying whether in-loop filtering is able to be performed across a boundary of a subpicture from a bitstream and performing the in-loop filtering on a boundary of a current block, based on the first flag. Based on the boundary of the current block being a boundary of a current subpicture including the current block, the in-loop filtering on the boundary of the current block is not performed, based on the first flag for the current subpicture specifying that the in-loop filtering is not able to be performed across the boundary of the current subpicture or the first flag for an adjacent subpicture adjacent to the boundary of the current block specifying that the in-loop filtering is not able to be performed across the boundary of the adjacent subpicture.

公开(公告)号：US20230396772A1

公开(公告)日：2023-12-07

申请号：US18234710

申请日：2023-08-16

Applicant: LG Electronics Inc.

Inventor： Jin HEO ,  Hyeong Moon JANG ,  Jangwon CHOI

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  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：US20230291933A1

公开(公告)日：2023-09-14

申请号：US17924829

申请日：2021-05-20

Applicant: LG Electronics Inc.

Inventor： Jung Hak NAM ,  Nae Ri PARK ,  Hyeong Moon JANG

IPC: H04N19/70 ,  H04N19/46 ,  H04N19/172

CPC classification number: H04N19/70 ,  H04N19/46 ,  H04N19/172

Abstract: An image encoding/decoding method and apparatus for signaling GCI and a method of transmitting a bitstream are provided. An image decoding method according to the present disclosure may comprise obtaining first information specifying whether to constrain application of a predetermined coding tool, obtaining second information specifying whether to apply the predetermined coding tool, and reconstructing a current picture based on the second information. A value of the second information may be determined based on a value of the first information, and the predetermined coding tool may comprise at least one of weighted prediction, explicit signaling of a scaling list for a transform coefficient or disabling of in-loop filtering at a virtual boundary.

公开(公告)号：US20230254476A1

公开(公告)日：2023-08-10

申请号：US17926859

申请日：2021-05-21

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG ,  Hendry HENDRY ,  Jung Hak NAM

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/172

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/172

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method comprises determining whether a current entry in a reference picture list structure is an inter-layer reference picture (ILRP) entry, determining whether a current layer including a current picture has a plurality of direct reference layers, based on the current entry being the ILRP entry, acquiring a layer index of the current entry for a direct reference layer list from a bitstream, based on the current layer having a plurality of direct reference layers, and determining a direct reference layer including the current entry based on the layer index. The obtaining of the layer index may be skipped based on the current layer doing not have a plurality of direct reference layers.

公开(公告)号：US20230209081A1

公开(公告)日：2023-06-29

申请号：US17920126

申请日：2021-05-21

Applicant: LG Electronics Inc.

Inventor： Nae Ri PARK ,  Jung Hak NAM ,  Hyeong Moon JANG ,  Jaehyun LIM ,  Seung Hwan KIM

IPC: H04N19/513 ,  H04N19/176

CPC classification number: H04N19/513 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise determining a motion vector and decoding a current block based on the motion vector. The motion vector may be determined based on at least one of a first reference picture type of a first reference picture corresponding to the current block or a second reference picture type of a second reference picture corresponding to an inter-layer corresponding block.

公开(公告)号：US20230199175A1

公开(公告)日：2023-06-22

申请号：US18110736

申请日：2023-02-16

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG

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

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

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 determining whether bi-directional optical flow (BDOF) or prediction refinement with optical flow (PROF) applies to a current block, based on BDOF or PROF applying to the current block, fetching a prediction sample of the current block from a reference picture of the current block based on motion information of the current block, and deriving a refined prediction sample for the current block, by applying BDOF or PROF to the current block based on the fetched prediction sample.

公开(公告)号：US20230171401A1

公开(公告)日：2023-06-01

申请号：US18086272

申请日：2022-12-21

Applicant: LG ELECTRONICS INC.

Inventor： Hyeong Moon JANG ,  Jin Heo

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

CPC classification number: H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/167 ,  H04N19/176 ,  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：US20230156231A1

公开(公告)日：2023-05-18

申请号：US17916653

申请日：2021-04-05

Applicant: LG Electronics Inc.

Inventor： Jung Hak NAM ,  Hendry HENDRY ,  Hyeong Moon JANG ,  Seung Hwan KIM

IPC: H04N19/70 ,  H04N19/503 ,  H04N19/30

CPC classification number: H04N19/70 ,  H04N19/503 ,  H04N19/30

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 determining whether a video parameter set (VPS) referenced by a sequence parameter set (SPS) is present, deriving information on inter layer prediction, based on the determination as to whether the video parameter set referenced by the sequence parameter set is present, and reconstructing an image based on the information on inter layer prediction.

公开(公告)号：US20230156196A1

公开(公告)日：2023-05-18

申请号：US18097905

申请日：2023-01-17

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：US20230115909A1

公开(公告)日：2023-04-13

申请号：US17914492

申请日：2021-03-17

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG ,  Sangheon LEE

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

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.