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：US20230171404A1

公开(公告)日：2023-06-01

申请号：US18096414

申请日：2023-01-12

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seung Hwan KIM ,  Hendry HENDRY ,  Seethal PALURI

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70

CPC classification number: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70

Abstract: Provided are an image encoding/decoding method and device. An image decoding method performed by an image decoding device according to the present disclosure includes the steps of: determining a quantization parameter of the current block on the basis of whether color space conversion is applied to a residual sample of the current block; determining a transform coefficient of the current block on the basis of the quantization parameter; determining the residual sample of the current block by using the transform coefficient; and resetting the value of the residual sample on the basis of whether the color space conversion is applied.

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：US20230012751A1

公开(公告)日：2023-01-19

申请号：US17952898

申请日：2022-09-26

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Seethal PALURI ,  Seung Hwan KIM

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/109 ,  H04N19/139 ,  H04N19/52 ,  H04N19/96 ,  H04N19/172

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method includes obtaining inter prediction information of a current block and wraparound information from a bitstream, and generating a prediction block of the current block based on the inter prediction information and the wraparound information. The wraparound information may include a first flag specifying whether wraparound motion compensation is enabled for a current video sequence including the current block. The first flag may have a first value specifying that the wraparound motion compensation is disabled, based on that one or more subpicture, which is coded independently and has a width different from a width of a current picture, is present in the current video sequence.

公开(公告)号：US20220377330A1

公开(公告)日：2022-11-24

申请号：US17882025

申请日：2022-08-05

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin HEO ,  Sunmi YOO ,  Jungah CHOI ,  Seung Hwan KIM

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus includes determining a splitting type of a current block, splitting the current block into a plurality of lower-layer blocks based on the splitting type, and decoding the lower-layer blocks. In this case, the current block may be a chroma block, and the determining the splitting type of the current block may be performed by disallowing a predetermined splitting type having a width or height of the lower-layer blocks being a predetermined value, among a plurality of splitting types.

公开(公告)号：US20220345726A1

公开(公告)日：2022-10-27

申请号：US17748847

申请日：2022-05-19

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seung Hwan KIM ,  Mehdi SALEHIFAR

IPC: H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/132 ,  H04N19/18 ,  H04N19/12 ,  H04N19/463

Abstract: Provided are an image encoding/decoding method and device. The image decoding method performed by the image decoding device, according to the present disclosure, may comprise the steps of: determining a residual sample of a current block; and resetting the value of the residual sample on the basis of whether a color space transform is applied. The step for resetting the value of the residual block may be performed on the basis of a half value of a chroma residual sample value.

公开(公告)号：US20220329814A1

公开(公告)日：2022-10-13

申请号：US17731044

申请日：2022-04-27

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seung Hwan KIM ,  Hendry HENDRY ,  Seethal PALURI

IPC: H04N19/132 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176 ,  H04N19/70

Abstract: An image encoding/decoding method and apparatus are provided. The image decoding method performed by the image decoding apparatus, according to the present disclosure, comprises the steps of: determining a current block by splitting an image on the basis of split information acquired from a bitstream; determining a quantization parameter of the current block; and determining a transform coefficient of the current block on the basis of the quantization parameter.

公开(公告)号：US20220239907A1

公开(公告)日：2022-07-28

申请号：US17611708

申请日：2020-05-18

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

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.