公开(公告)号：US20220132109A1

公开(公告)日：2022-04-28

申请号：US17428138

申请日：2020-02-21

Applicant: LG ELECTRONICS INC.

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

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

Abstract: An image decoding method executed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction type for the current block from among the intra prediction types; establishing an intra prediction mode candidate list for the current block by executing a process for establishing an intra prediction mode candidate list; selecting an intra prediction mode for the current block on the basis of the intra prediction mode candidate list; and generating prediction samples for the current block on the basis of the intra prediction type and intra prediction mode.

公开(公告)号：US20220021902A1

公开(公告)日：2022-01-20

申请号：US17299630

申请日：2019-11-27

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/593 ,  H04N19/186 ,  H04N19/105 ,  H04N19/11

Abstract: An image decoding method according to the present document includes: a step for deriving a luma intra prediction mode; and a step for generating a chroma candidate mode list for a chroma block including a preset number of chroma intra candidates by using at least one among a DM, a planar mode, a DC mode, a vertical mode, a horizontal mode, and an up-right diagonal mode, which are derived from the luma intra prediction mode, wherein the DM is a prediction mode corresponding to a center (CR) position of the luma block, and the chroma intra candidates other than the DM can be derived through a duplicate check of the DM and a prediction mode corresponding to any one among the top left (TL), top right (TR), bottom left (BL), and bottom right (BR) of the luma block, the planar mode, the DC mode, the vertical mode, and the horizontal mode.

公开(公告)号：US20220021882A1

公开(公告)日：2022-01-20

申请号：US17294943

申请日：2019-11-27

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/46 ,  H04N19/186 ,  H04N19/169 ,  H04N19/176

Abstract: An image decoding method according to the present document may include: a step for determining whether a current block is a dual-tree type in which individual division structures are applied to a luma component block and a chroma component block of the current block; a step for determining whether the current block is the luma component block to which the dual-tree type is applied, when the current block is determined to be the dual-tree type; a step for parsing a transform skip flag indicating whether a transform skip is applied to the luma component block, when the current block is the luma component block; a step for deriving whether a transform skip is applied to the chroma component block according to a preset condition, when the current block is not the luma component block; and a step for deriving a residual sample on the basis of the transform skip flag and residual information on the current block.

公开(公告)号：US20210281833A1

公开(公告)日：2021-09-09

申请号：US17257169

申请日：2019-07-02

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/423 ,  H04N19/44

Abstract: Embodiments of the present disclosure provide a method and an apparatus for processing a video signal through intra prediction. A method for processing a video signal according to an embodiment of the present disclosure may include: checking that intra prediction is applied to a current block including a current sample to be predicted; determining a first reference sample value on a first reference location from at least one of samples positioned at an upper horizontal line and a left vertical line adjacent to the current block, based on an intra-prediction direction of the current block; determining a second reference sample value on a second reference location positioned in an opposite direction to the intra-prediction direction from a location of the current sample or the first reference location; determining a distance between the first reference location and the current sample as a first distance and determining a distance between the second reference location and the current sample as a second distance; and generating a prediction value of the current sample using the linear interpolation prediction based on a sample value of the first reference sample, the first distance, a sample value of the second reference sample, and the second distance.

公开(公告)号：US20210211667A1

公开(公告)日：2021-07-08

申请号：US17207162

申请日：2021-03-19

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Sunmi YOO ,  Yin HEO ,  Seunghwan KIM ,  Jangwon CHOI

IPC: H04N19/122 ,  H04N19/136 ,  H04N19/176 ,  H04N19/196

Abstract: A method for decoding a picture performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information, deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream, deriving a transform coefficient from the quantized transform coefficient based on a dequantization process, deriving a residual sample for the current block by applying an inverse transform to the derived transform coefficient, and generating a reconstructed picture based on the residual sample for the current block.

公开(公告)号：US20200374516A1

公开(公告)日：2020-11-26

申请号：US16769429

申请日：2017-12-04

Applicant: LG Electronics Inc.

Inventor： Jin HEO ,  Junghak NAM ,  Sunmi YOO ,  Jangwon CHOI

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61 ,  H04N19/44 ,  H04N19/625

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises a step of obtaining information on an intra prediction mode of a current chroma block and a transform coefficients, a step of generating a prediction sample based on the intra prediction mode of the current chroma block, a step of generating a residual sample using the transform coefficients of the current chroma block based on the transform information of the corresponding luma block of the current chroma block, and a step of generating a reconstruction sample based on the prediction sample and the residual sample.

公开(公告)号：US20200177878A1

公开(公告)日：2020-06-04

申请号：US16625975

申请日：2018-03-19

Applicant: LG ELECTRONICS INC

Inventor： Jangwon CHOI ,  Jaehyun LIM

IPC: H04N19/11 ,  H04N19/119 ,  H04N19/593 ,  H04N19/176 ,  H04N19/159 ,  H04N19/186

Abstract: Disclosed are an intra-prediction mode-based image processing method and apparatus. In particular, the intra-prediction mode-based image processing method may comprise the steps of: generating a first prediction sample by performing spatial prediction on a current chroma block; determining whether or not a combined intra-prediction mode is applicable to the current chroma block; when the combined intra-prediction mode is applicable to the current chroma block, determining a component prediction mode used for inter-component prediction of the current chroma block; generating a second prediction sample by applying the determined component prediction mode to the current chroma block; and generating a final prediction sample of the current chroma block by using the first prediction sample and the second prediction sample.

公开(公告)号：US20200021806A1

公开(公告)日：2020-01-16

申请号：US16507558

申请日：2019-07-10

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/176 ,  H04N19/159 ,  H04N19/46

Abstract: Provided is a video decoding method performed by a decoding apparatus, which includes: obtaining intra prediction information of the current block through a bitstream; deriving MPM (Most Probable Mode) list including MPM candidates of the current block; when a value of a MPM flag is 0, deriving an intra prediction mode of the current block based on the remaining intra prediction mode information, in which the intra prediction mode is one of remaining intra prediction modes excluding the MPM candidates; deriving a prediction sample of the current block based on the intra prediction mode; and deriving a reconstructed picture based on the prediction sample, in which the intra prediction information includes the MPM flag, the intra prediction information includes the remaining intra prediction mode information when the value of the MPM flag is 0, the MPM flag is coded through a fixed length (FL) binarization process, a binarization parameter for the FL binarization process is 1, the remaining intra prediction mode information is coded through a truncated binary (TB) binarization process, and a binarization parameter for the TB binarization process is 60.

公开(公告)号：US20250080754A1

公开(公告)日：2025-03-06

申请号：US18293202

申请日：2022-08-18

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Jaehyun LIM ,  Nae Ri PARK ,  Sunmi YOO ,  Jung Hak NAM ,  Hyeong Moon JANG

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/117 ,  H04N19/176

Abstract: Provided are an image encoding/decoding method and apparatus. An image decoding method performed by an image decoding apparatus may comprise determining an intra prediction mode of a current block, performing planar intra prediction based on the intra prediction mode being a planar prediction mode and obtaining a reconstructed sample of the current block based on a prediction sample obtained based on the planar intra prediction. The performing the planar intra prediction may comprise applying filtering to an intra prediction reference sample of the current block.

公开(公告)号：US20250080720A1

公开(公告)日：2025-03-06

申请号：US18726662

申请日：2022-12-28

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Sunmi YOO ,  Junghak NAM ,  Hyeongmoon JANG ,  Jangwon CHOI

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70

Abstract: An image encoding/decoding method and device according to the present disclosure can generate a candidate list of a current block, add an average candidate to the candidate list of the current block, and perform inter-prediction on the current block on the basis of the candidate list including the average candidate. Here, the candidate list includes a plurality of affine candidates, the plurality of affine candidates include at least one from among an inherited candidate, a constructed candidate, and a history-based candidate, and the average candidate can be generated on the basis of two affine candidates selected according to a predetermined priority from the candidate list.