公开(公告)号：US20210112252A1

公开(公告)日：2021-04-15

申请号：US16496288

申请日：2017-09-28

Applicant: LG ELECTRONICS INC.

Inventor： Jin HEO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/124

Abstract: An intra prediction method performed by a decoding device, according to the present disclosure, comprises the steps of: deriving an intra prediction mode for a current block; deriving neighboring samples of the current block; deriving reference samples for a target sample of the current block among the neighboring samples on the basis of the intra prediction mode; deriving weighted values of the reference samples for the target sample; and deriving a prediction sample of the target sample on the basis of the reference samples and the weighted values.

公开(公告)号：US20210021871A1

公开(公告)日：2021-01-21

申请号：US17042722

申请日：2019-05-01

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/625 ,  H04N19/159 ,  H04N19/176

Abstract: The present disclosure provides a method for reconstructing a video signal based on low-complexity transform implementation including obtaining a transform index of a current block from the video signal, wherein the transform index corresponds to any one of a plurality of transform combinations including a combination of DST4 and/or DCT4; deriving a transform combination corresponding to the transform index, wherein the transform combination includes a horizontal transform and a vertical transform, and wherein the horizontal transform and the vertical transform correspond to at least one of the DST4 or the DCT4; performing an inverse transform in a vertical direction with respect to the current block by using the DST4; performing an inverse transform in a horizontal direction with respect to the current block by using the DCT4; and reconstructing the video signal by using the current block which the inverse transform is performed.

公开(公告)号：US20200252615A1

公开(公告)日：2020-08-06

申请号：US16855785

申请日：2020-04-22

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Seunghwan KIM ,  Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jangwon CHOI

IPC: H04N19/132 ,  H04N19/60 ,  H04N19/129 ,  H04N19/46 ,  H04N19/176

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information; deriving quantized transform coefficients for a current block based on the residual information included in the bitstream; deriving transform coefficients for the current block from the quantized transform coefficients based on an inverse quantization process; deriving residual samples for the current block by applying inverse transform to the derived transform coefficients; and generating a reconstructed picture based on the residual samples for the current block.

公开(公告)号：US20190335170A1

公开(公告)日：2019-10-31

申请号：US16475306

申请日：2018-01-03

Applicant: LG ELECTRONICS INC.

Inventor： Jaeho LEE ,  Seunghwan KIM ,  Sunmi YOO

IPC: H04N19/109 ,  H04N19/176 ,  H04N19/513

Abstract: The present invention provides a method of decoding a video signal comprising a current block using an affine mode, including parsing a skip flag or a merge flag from the video signal, identifying whether the sample number or size of the current block satisfies a preset condition if a skip mode or a merge mode is applied based on the skip flag or merge flag, parsing an affine flag if the condition is satisfied, wherein the affine flag indicates whether an affine prediction mode is applied, and the affine prediction mode indicates a mode deriving a motion vector in a pixel or subblock unit using a control point motion vector, and determining an affine merge mode as an optimal prediction mode if the affine prediction mode is applied based on the affine flag.

公开(公告)号：US20250150637A1

公开(公告)日：2025-05-08

申请号：US19018991

申请日：2025-01-13

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM

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

Abstract: According to the disclosure of the present document, scaling list data and scaling list-associated information can be signaled hierarchically, which can consequently reduce the amount of data to be signaled for video/image coding and increase coding efficiency.

公开(公告)号：US20250150627A1

公开(公告)日：2025-05-08

申请号：US19015534

申请日：2025-01-09

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/122 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

Abstract: An image decoding method according to the present document may include the steps of: deriving the position of the final significant coefficient in the current block and transform coefficients for the current block on the basis of residual information; determining whether the index of a sub—block including the final significant coefficient is 0 and whether the position of the final significant coefficient in the sub-block is greater than 0; determining whether a significant coefficient exists in a second area excluding a first area at the upper left end of the current block; and parsing an LFNST index from a bitstream when the position of the final significant coefficient is determined to be greater than 0 in the sub-block in which the index is 0, and the significant coefficient does not exist in the second area.

公开(公告)号：US20250150612A1

公开(公告)日：2025-05-08

申请号：US19017080

申请日：2025-01-10

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：US20250142052A1

公开(公告)日：2025-05-01

申请号：US19005629

申请日：2024-12-30

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/82

Abstract: According to the disclosure of the present document, scaling list data transmitted from an adaptation parameter set (APS) can be signaled through a hierarchical structure. In addition, by setting a limit on the scaling list data transmitted from the APS, it is possible to reduce the amount of data which has to be signaled for video/image coding, and facilitate implementation.

公开(公告)号：US20250126267A1

公开(公告)日：2025-04-17

申请号：US18984222

申请日：2024-12-17

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

Abstract: A method for image decoding, according to the present document, may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; and determining an LFNST set including LFNST matrices on the basis of the updated intra prediction mode, wherein the updated intra prediction mode is derived as an intra prediction mode corresponding to a specific position in the luma block, and the specific position is set on the basis of a color format of the chroma block.

公开(公告)号：US20250106393A1

公开(公告)日：2025-03-27

申请号：US18899429

申请日：2024-09-27

Applicant: LG ELECTRONICS INC.

Inventor： Hendry TAN ,  Junghak NAM ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/117 ,  H04N19/70

Abstract: An image decoding method including obtaining a neural network post-filter (NNPF) group (NNPFG) characteristics supplemental enhancement information (SEI) message specifying information related to a group of two or more NNPFs to be applied to image data; determining a grouping type of the group of the two or more NNPFs based on the message; based on the grouping type indicating that only one of the group of the two or more NNPFs is to be selected to be applied, or that the group of the two or more NNPFs are to be applied in parallel, obtaining a value corresponding to a purpose of each of the group of the two or more NNPFs; and applying at least one of the group of the two or more NNPFs to the image data based the obtained value.