公开(公告)号：US20240406437A1

公开(公告)日：2024-12-05

申请号：US18698326

申请日：2022-10-04

Applicant: LG ELECTRONICS INC.

Inventor： Jung Hak NAM ,  Sunmi YOO ,  Jaehyun LIM ,  Seung Hwan KIM

IPC: H04N19/59 ,  H04N19/124 ,  H04N19/159

Abstract: An image encoding/decoding method and apparatus are provided. The image decoding method performed by the image decoding apparatus may comprise deriving a reference picture for inter prediction of a current picture, deriving a resolution ratio between the reference picture and the current picture, and modifying a resolution of the reference picture based on the resolution ratio. The resolution ratio may be derived based on resolution index information of a bitstream

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：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：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：US20230145282A1

公开(公告)日：2023-05-11

申请号：US18092826

申请日：2023-01-03

Applicant: LG Electronics Inc.

Inventor： Ling LI ,  Jung Hak NAM ,  Jaehyun LIM ,  Jin HEO ,  Seung Hwan KIM

IPC: H04N19/117 ,  H04N19/186 ,  H04N19/423 ,  H04N19/70 ,  H04N19/82

CPC classification number: H04N19/117 ,  H04N19/186 ,  H04N19/423 ,  H04N19/70 ,  H04N19/82

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a chroma array type of a current image, determining an adaptive loop filter (ALF) indicator of a chroma component based on the chroma array type, and performing ALF filtering with respect to a reconstructed image based on a value of the ALF indicator. The value of the ALF indicator may be determined to be a predetermined value without being obtained from a bitstream, based on the chroma array type being a predetermined type, and the value of the ALF indicator may be obtained from the bitstream, based on the chroma array type being not the predetermined type.

公开(公告)号：US20220417512A1

公开(公告)日：2022-12-29

申请号：US17867133

申请日：2022-07-18

Applicant: LG ELECTRONICS INC.

Inventor： Ling LI ,  Jin HEO ,  Moonmo KOO ,  Jung Hak NAM

IPC: H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may include determining whether a prediction mode of a current block is an intra prediction mode based on information on the prediction mode of the current block, determining whether intra sub-partitions (ISP) is available for the current block, when the prediction mode of the current block is an intra prediction mode, decoding an ISP application indicator indicating whether to apply ISP to the current block, when ISP is available for the current block, and generating a prediction block for the current block by applying ISP to the current block, upon determining that ISP applies to the current block based on the ISP application indicator.

公开(公告)号：US20220279189A1

公开(公告)日：2022-09-01

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

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.