公开(公告)号：US20230308664A1

公开(公告)日：2023-09-28

申请号：US18139479

申请日：2023-04-26

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/186 ,  H04N19/132 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70 ,  H04N19/96

CPC classification number: H04N19/186 ,  H04N19/132 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/1887 ,  H04N19/70 ,  H04N19/96 ,  H04N19/117

Abstract: According to the disclosure of the present document, the granularity of value(s) of a chroma residual scaling factor can be controlled through explicit signaling of information on the value(s) of the chroma residual scaling factor. In addition, chroma residual scaling can be efficiently performed through implicit derivation of the information on the value(s) of the chroma residual scaling factor.

公开(公告)号：US20230199191A1

公开(公告)日：2023-06-22

申请号：US17916452

申请日：2021-03-26

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/136 ,  H04N19/70 ,  H04N19/186 ,  H04N19/103

CPC classification number: H04N19/136 ,  H04N19/70 ,  H04N19/186 ,  H04N19/103 ,  H04N19/82

Abstract: An image encoding/decoding method and apparatus for signaling a high level syntax (HLS) and a method of transmitting a bitstream are provided. An image decoding method according to the present disclosure may include obtaining first information indicating whether to constrain luma mapping with chroma scaling (LMCS), obtaining second information indicating whether LMCS for a current video sequence is allowed, and reconstructing a current picture within the current video sequence based on the second information. A value of the second information may be determined based on a value of the first information.

公开(公告)号：US20230139083A1

公开(公告)日：2023-05-04

申请号：US17795071

申请日：2021-01-25

Applicant: LG Electronics Inc.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/186 ,  H04N19/159 ,  H04N19/70 ,  H04N19/132

Abstract: According to the disclosure of this document, it is possible to derive a residual sample by applying an adaptive color transform (ACT) to a current block on the basis of ACT-related information, and at this time, the residual sample is clipped and derived on the basis of a clipping range, wherein the clipping range is determined on the basis of a bit depth.

公开(公告)号：US20230055747A1

公开(公告)日：2023-02-23

申请号：US17970752

申请日：2022-10-21

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/46 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: obtaining image information; and generating a reconstructed picture on the basis of the image information.

公开(公告)号：US20230039761A1

公开(公告)日：2023-02-09

申请号：US17960986

申请日：2022-10-06

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/109 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: According to disclosure of the present document, an LMCS procedure can be used for blocks having various block tree structures, and memories used in the LMCS procedure can be reduced (limited).

公开(公告)号：US20220408103A1

公开(公告)日：2022-12-22

申请号：US17623386

申请日：2020-06-24

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/186 ,  H04N19/70 ,  H04N19/124 ,  H04N19/159 ,  H04N19/107 ,  H04N19/132 ,  H04N19/18 ,  H04N19/12 ,  H04N19/172 ,  H04N19/61

Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information comprising a flag indicating whether or not one chroma quantization parameter table is to be applied with respect to chroma components, and prediction information and residual information regarding the chroma components; on the basis of the flag, deriving a chroma quantization parameter for the chroma components; deriving residual samples for the chroma components on the basis of the residual information and the chroma quantization parameter; and generating a reconstructed picture on the basis of prediction samples, which have been derived on the basis of the prediction information, and the residual samples.

公开(公告)号：US20220353518A1

公开(公告)日：2022-11-03

申请号：US17860625

申请日：2022-07-08

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/186 ,  H04N19/132 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70 ,  H04N19/96

Abstract: According to the disclosure of the present document, the resources necessary for an LMCS process may be reduced by limiting the range that an LMCS APS occupies in all APSs. Thus, the degree of complexity in LMCS may be reduced, and video/image coding efficiency may be increased.

公开(公告)号：US20220337836A1

公开(公告)日：2022-10-20

申请号：US17731031

申请日：2022-04-27

Applicant: LG ELECTRONICS INC.

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

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

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：US20220272370A1

公开(公告)日：2022-08-25

申请号：US17686124

申请日：2022-03-03

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Jie ZHAO ,  Seung Hwan KIM

IPC: H04N19/46 ,  H04N19/14 ,  H04N19/132 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise obtaining, from a picture parameter set, a first signaling flag specifying whether an identifier of a subpicture splitting a current picture is signaled using the picture parameter set, obtaining identifier information of the subpicture from the picture parameter set, based on the first signaling flag specifying that the identifier of the subpicture is signaled using the picture parameter set, and decoding the current picture by decoding a current subpicture identified based on the identifier information.

公开(公告)号：US20220141473A1

公开(公告)日：2022-05-05

申请号：US17566902

申请日：2021-12-31

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/157 ,  H04N19/46

Abstract: According to the disclosure of the present document, by explicitly signaling information relating to a value(s) of a chroma residual scaling factor, accuracy in an LMCS procedure can be increased, and therefore a subjective/objective image quality of a coded image/video can be further improved.