公开(公告)号：US12022080B2

公开(公告)日：2024-06-25

申请号：US17432875

申请日：2020-02-26

Applicant: LG ELECTRONICS INC.

Inventor： Jie Zhao ,  Seunghwan Kim

IPC: H04N19/132 ,  H04N19/134 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/189 ,  H04N19/61

CPC classification number: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/134 ,  H04N19/189 ,  H04N19/61

Abstract: According to a method, forward reshaping may be performed for inter prediction luma blocks averaged in a domain reshaped for luma mapping, and inverse reshaping may be performed for intra prediction luma blocks averaged in an original domain or an average luma value of the intra prediction luma blocks inversely mapped in the original domain may be derived. In addition, a chroma residual scaling index may be derived on the basis of a simple bit shifting operation so that the method may perform reshaping for an average luma value and may reduce the number of operations required for the reshaping.

公开(公告)号：US12010324B2

公开(公告)日：2024-06-11

申请号：US18200348

申请日：2023-05-22

Applicant: LG Electronics Inc.

Inventor： Seethal Paluri ,  Seunghwan Kim

IPC: H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/52 ,  H04N19/91

CPC classification number: H04N19/139 ,  H04N19/159 ,  H04N19/167 ,  H04N19/172 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/52 ,  H04N19/91

Abstract: A picture decoding method performed by a decoding apparatus according to the present disclosure includes obtaining motion prediction information from bitstream, generating an affine MVP candidate list including affine MVP candidates for a current block, deriving CPMVPs for respective CPs of the current block based on one of the affine MVP candidates included in the affine MVP candidate list, deriving the CPMVDs for the CPs of the current block based on information on CPMVDs for each of the CPs included in the obtained motion prediction information, deriving CPMVs for the CPs of the current block based on the CPMVPs and the CPMVDs, deriving prediction samples for the current block based on the CPMVs, and generating reconstructed samples for the current block based on the derived prediction samples.

公开(公告)号：US12010311B2

公开(公告)日：2024-06-11

申请号：US17623377

申请日：2020-06-24

Applicant: LG Electronics Inc.

Inventor： Seethal Paluri ,  Seunghwan Kim ,  Jie Zhao

IPC: H04N19/124 ,  H04N19/172 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/124 ,  H04N19/172 ,  H04N19/186 ,  H04N19/70

Abstract: A method for decoding an image performed by a decoding apparatus, 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：US12003757B2

公开(公告)日：2024-06-04

申请号：US17438276

申请日：2020-03-10

Applicant: LG ELECTRONICS INC.

Inventor： Mehdi Salehifar ,  Seunghwan Kim

IPC: H04N7/12 ,  H04N19/109 ,  H04N19/139 ,  H04N19/176 ,  H04N19/52

CPC classification number: H04N19/52 ,  H04N19/109 ,  H04N19/139 ,  H04N19/176

Abstract: Embodiments of the present specification provide a method and a device for processing motion vector difference (MVD) information for inter prediction in a video signal. A method for decoding MVD information comprises the steps of: acquiring a first flag indicating whether a MVD for predicting the current block is greater than a first value; on the basis of the first flag, acquiring a second flag indicating whether the MVD is greater than a second value; and decoding size information of the MVD on the basis of the second flag, wherein a step for acquiring the size information of the MVD comprises a step for, if the MVD is equal to or smaller than the second value, decoding the size information of the MVD on the basis of a first difference value which corresponds to the difference between the second value and the first value.

公开(公告)号：US12003727B2

公开(公告)日：2024-06-04

申请号：US17623367

申请日：2020-06-24

Applicant: LG Electronics Inc.

Inventor： Seethal Paluri ,  Seunghwan Kim ,  Jie Zhao

IPC: H04N19/132 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/132 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: obtaining a flag indicating whether one chroma quantization parameter table is applied to chroma components; obtaining chroma quantization parameter data on the basis of the flag; deriving the chroma quantization parameter table on the basis of the chroma quantization parameter data; deriving a chroma quantization parameter for the chroma components on the basis of the chroma quantization parameter table; deriving residual samples for the chroma components on the basis of the chroma quantization parameter; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US11979609B2

公开(公告)日：2024-05-07

申请号：US18133799

申请日：2023-04-12

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan Kim ,  Medhi Salehifar ,  Moonmo Koo ,  Jaehyun Lim

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/593 ,  H04N19/61

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/176 ,  H04N19/593

Abstract: The present disclosure, in a method of decoding a video signal, provides a method including checking whether a transform skip is applied to a current block; acquiring a transform index indicating transform types applied to a horizontal direction and a vertical direction of the current block from among a plurality of predefined transform types from the video signal when the transform skip is not applied to the current block; and performing an inverse primary transform on the current block using the transform types indicated by the transform index, wherein the transform types applied to the horizontal direction and the vertical direction of the current block are determined from among transform types defined according to an intra prediction mode of the current block based on the transform index.

公开(公告)号：US11968359B2

公开(公告)日：2024-04-23

申请号：US18199191

申请日：2023-05-18

Applicant: LG ELECTRONICS INC.

Inventor： Ling Li ,  Seunghwan Kim ,  Jin Heo ,  Sunmi Yoo ,  Jangwon Choi ,  Jungah Choi

IPC: H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/593 ,  H04N19/70

CPC classification number: H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/593 ,  H04N19/70

Abstract: A video decoding method according to this document includes constructing a most probable mode (MPM) list by deriving MPM candidates for a current block based on a neighboring block adjacent to the current block, deriving an intra prediction mode for the current block based on the MPM list, generating predicted samples by performing prediction for the current block based on the intra prediction mode, and generating a reconstructed picture for the current block based on the predicted samples.

公开(公告)号：US11956458B2

公开(公告)日：2024-04-09

申请号：US18230286

申请日：2023-08-04

Applicant: LG ELECTRONICS INC.

Inventor： Jungah Choi ,  Sunmi Yoo ,  Jaehyun Lim ,  Jangwon Choi ,  Seunghwan Kim

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

CPC classification number: H04N19/46 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device according to the present document is characterized by comprising the steps of: acquiring image information including a Block-based Delta Pulse Code Modulation (BDPCM) available flag; and generating a reconstructed picture on the basis of the image information, wherein the BDPCM available flag relates to whether BDPCM is available for chroma and luma blocks.

公开(公告)号：US11956451B2

公开(公告)日：2024-04-09

申请号：US18202023

申请日：2023-05-25

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon Choi ,  Jin Heo ,  Seunghwan Kim ,  Sunmi Yoo ,  Ling Li ,  Jungah Choi

IPC: H04N19/186 ,  H04N19/105 ,  H04N19/136 ,  H04N19/176

CPC classification number: H04N19/186 ,  H04N19/105 ,  H04N19/136 ,  H04N19/176

Abstract: A video decoding method performed by a decoding apparatus includes deriving one of a plurality of cross-component linear model (CCLM) prediction mode as a CCLM prediction mode of the current chroma block, deriving a sample number of neighboring chroma samples of the current chroma block based on the CCLM prediction mode of the current chroma block, a size of the current chroma block, and a specific value derived as 2. The method includes deriving the neighboring chroma samples of the sample number, calculating CCLM parameters based on the neighboring chroma samples and the down sampled neighboring luma samples, deriving prediction samples for the current chroma block based on the CCLM parameters and the down sampled luma samples and generating reconstructed samples for the current chroma block based on the prediction samples.

公开(公告)号：US11949873B2

公开(公告)日：2024-04-02

申请号：US17775682

申请日：2020-11-09

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Mehdi Salehifar ,  Jaehyun Lim

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises a step of applying an inverse primary transform to a transform coefficient so as to derive residual samples for a current block, wherein: the inverse primary transform is performed on the basis of an MTS index received from a bitstream; the MTS index is parsed on the basis of an effective coefficient not existing in a second area that excludes the left top first area of the current block; and the first area is a left top 16×16 area of the current block.