公开(公告)号：US20210409727A1

公开(公告)日：2021-12-30

申请号：US16625535

申请日：2018-05-11

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/159 ,  H04N19/132 ,  H04N19/105 ,  H04N19/46 ,  H04N19/18 ,  H04N19/176

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 reference samples of the current block; determining whether a PDPC or UWP for the current block is performed; deriving weights for target sample of the current block when the UWP is performed on the current block; deriving reference samples of the target sample, according to the intra-prediction mode, among the reference samples; and deriving a prediction sample of the target sample by performing weighted sum for the reference samples of the target samples on the basis of the weights.

公开(公告)号：US20210409716A1

公开(公告)日：2021-12-30

申请号：US17373114

申请日：2021-07-12

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/88 ,  H04N19/46 ,  H04N19/70 ,  H04N19/18 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: receiving a bitstream including residual information of a current block; deriving a specific number of context-encoding bins for context syntax elements for a current sub-block of the current block; decoding the context syntax elements for the current sub-block included in the residual information on the basis of the specific number; deriving transform coefficients for the current sub-block on the basis of the decoded context syntax elements; deriving residual samples for the current block on the basis of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20210385478A1

公开(公告)日：2021-12-09

申请号：US17400718

申请日：2021-08-12

Applicant: LG Electronics Inc.

Inventor： Sunmi YOO ,  Jungah CHOI ,  Seunghwan KIM

IPC: H04N19/46 ,  H04N19/176 ,  H04N19/103 ,  H04N19/136

Abstract: A video decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: receiving residual information for a current block; deriving a context model for a sine flag of a current residual coefficient in a current sub-block of the current block; decoding the sine flag on the basis of the context model; deriving the current residual coefficient on the basis of the sine flag; deriving a residual sample on the basis of the current residual coefficient; and generating a reconstructed picture on the basis of the residual sample, wherein the context model for the sine flag is derived on the basis of a sine flag of a residual coefficient decoded before the current residual coefficient in the current sub-block.

公开(公告)号：US20210377568A1

公开(公告)日：2021-12-02

申请号：US17394734

申请日：2021-08-05

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/18 ,  H04N19/124 ,  H04N19/119 ,  H04N19/159 ,  H04N19/132 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for non-separable quadratic transform; deriving transform coefficients by inversely quantizing the quantized transform coefficient; deriving corrected transform coefficients on the basis of a transform kernel matrix in a predetermined transform set indicated by the transform index; and deriving residual samples for the target block on the basis of inverse linear transform for the corrected transform coefficients, wherein when the target block is divided into a predetermined number of sub-blocks and is coded by intra prediction, the corrected transform coefficients are derived in units of the sub-blocks, and the transform index is received for the target block.

公开(公告)号：US20210337204A1

公开(公告)日：2021-10-28

申请号：US17312602

申请日：2019-12-31

Applicant: LG Electronics Inc.

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

IPC: H04N19/124 ,  H04N19/13 ,  H04N19/132 ,  H04N19/70 ,  H04N19/18 ,  H04N19/176 ,  H04N19/129

Abstract: An image decoding method, which is performed by a decoding device according to the present document, is characterized by including: a step for receiving a bitstream including residual information about the current block; a step for deriving a maximum value of the number of context-encoding bins for context syntax elements coded on the basis of context included in the residual information; a step for entropy-decoding the context syntax elements on the basis of the maximum value; a step for deriving conversion coefficients for the current block on the basis of the entropy-decoded context syntax elements; a step for deriving a residual sample for the current block on the basis of the conversion coefficients; and a step for generating a reconstructed picture on the basis of the residual sample for the current block.

公开(公告)号：US20210329281A1

公开(公告)日：2021-10-21

申请号：US17266407

申请日：2019-08-08

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/44 ,  H04N19/625 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/176

Abstract: The present invention relates to a video signal decoding method based on a Multiple Transform Selection (MTS). The method may comprise the steps of: parsing a first syntax element representing whether MTS applies to the inverse transformation of a current block, wherein the MTS represents a transform mode which uses a transform type other than a default transform type predefined for the current block; by performing inverse quantization on the current block, deriving an inverse-quantized transform coefficient array having the width and the height of the current block; determining, on the basis of the first syntax element, a vertical transform type applying to the vertical direction of the current block, and a horizontal transform type applying to the horizontal direction of the current block; and, by performing inverse transformation on the inverse-quantized transform coefficient array by using the vertical transform type and the horizontal transform type, deriving a residual sample array having the width and the height of the current block.

公开(公告)号：US20210274207A1

公开(公告)日：2021-09-02

申请号：US17242646

申请日：2021-04-28

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Seunghwan KIM ,  Junghak NAM ,  Jaehyun LIM ,  Hyeongmoon JANG

IPC: H04N19/513 ,  H04N19/115 ,  H04N19/176

Abstract: An image decoding method performed by a decoding apparatus, includes deriving a history-based motion vector prediction (HMVP) buffer for a current block based on a history, and deriving motion information of the current block based on an HMVP candidate included in the HMVP buffer, thereby increasing inter prediction efficiency.

公开(公告)号：US20210120231A1

公开(公告)日：2021-04-22

申请号：US17138494

申请日：2020-12-30

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/103 ,  H04N19/176 ,  H04N19/61

Abstract: A method for decoding an image according to the present document includes obtaining prediction mode information and residual related information from a bitstream, deriving prediction samples of a current block by performing prediction based on the prediction mode information, deriving residual samples of the current block based on the residual related information, and generating reconstruction samples of the current block based on the prediction samples and the residual samples, and the residual related information includes a transform skip flag based on a size of the current block and a maximum transform skip size, the transform skip flag represents whether a transform skip is applied to the current block, and information about the maximum transform skip size is obtained from the bitstream.

公开(公告)号：US20210105481A1

公开(公告)日：2021-04-08

申请号：US17124989

申请日：2020-12-17

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Seethal PALURI ,  Jaeho LEE

IPC: H04N19/137 ,  H04N19/132 ,  H04N19/70 ,  H04N19/46 ,  H04N19/176

Abstract: Disclosed are a method for processing a video signal and an apparatus therefor. Specifically, a method for processing a video signal by using affine prediction may comprise the steps of: checking whether the affine prediction is applied to a current block; when it is confirmed that the affine prediction is applied to the current block, acquiring at least one syntax element indicating a resolution of a motion vector difference used for the affine prediction; deriving a motion vector of a control point of the current block on the basis of the at least one syntax element; deriving a motion vector of each of multiple sub-blocks included in the current block on the basis of the motion vector of the control point; and generating a prediction sample of the current block by using the motion vector of each of the sub-blocks.

公开(公告)号：US20200267382A1

公开(公告)日：2020-08-20

申请号：US16815884

申请日：2020-03-11

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/70 ,  H04N19/176

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.