公开(公告)号：US11516510B2

公开(公告)日：2022-11-29

申请号：US17503788

申请日：2021-10-18

Applicant: LG ELECTRONICS INC.

Inventor： Junghak Nam ,  Jaehyun Lim ,  Moonmo Koo ,  Seunghwan Kim

IPC: H04N19/60 ,  H04N19/122 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to the present document comprises the steps of: acquiring prediction-related information and residual-related information for a current block; deriving transform coefficients for the current block on the basis of the residual-related information; and generating residual samples of the current block on the basis of the transform coefficients, wherein the residual-related information includes low-frequency non-separable transform (LFNST) index information indicating information relating to non-separable transform for a low-frequency transform coefficient of the current block on the basis of a matrix-based intra prediction (MIP) flag.

公开(公告)号：US11509903B2

公开(公告)日：2022-11-22

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 ,  H04N19/176 ,  H04N19/169

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：US11477453B2

公开(公告)日：2022-10-18

申请号：US16859105

申请日：2020-04-27

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: According to an embodiment of the present invention, a picture decoding method performed by a decoding apparatus is provided. The method comprises: decoding image information comprising information on a quantization parameter (QP), deriving an expected average luma value of a current block from neighboring available samples, deriving a quantization parameter offset (QP offset) for deriving a luma quantization parameter (luma QP) based on the expected average luma value and the information on the QP, deriving the luma QP based on the QP offset, performing an inverse quantization for a quantization group comprising the current block based on the derived luma QP, generating residual samples for the current block based on the inverse quantization, generating prediction samples for the current block based on the image information and generating reconstructed samples for the current block based on the residual samples for the current block and the prediction samples for the current block.

公开(公告)号：US11470325B2

公开(公告)日：2022-10-11

申请号：US17572329

申请日：2022-01-10

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Jaehyun Lim ,  Junghak Nam

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

Abstract: A method for decoding an image, according to the present document, comprises: receiving a bitstream including BDPCM information; deriving residual samples for a current block on the basis of the BDPCM information; deriving prediction samples for the current block on the basis of the BDPCM information; generating a reconstructed picture on the basis of the residual samples and the prediction samples; and performing deblocking filtering on the reconstructed picture, wherein when BDPCM is applied to the current block, the deblocking filtering is not performed.

公开(公告)号：US11463722B2

公开(公告)日：2022-10-04

申请号：US17306343

申请日：2021-05-03

Applicant: LG ELECTRONICS INC.

Inventor： Joonyoung Park ,  Sangchul Kim ,  Seungwook Park ,  Jaehyun Lim ,  Yongjoon Jeon ,  Byeongmoon Jeon ,  Younghee Choi ,  Jaewon Sung ,  Jungsun Kim ,  Jingyeong Kim ,  Taeil Chung

IPC: H04N19/513 ,  H04N19/51 ,  H04N19/105 ,  H04N19/176 ,  H04N19/167 ,  H04N19/583

Abstract: The method for deriving a temporal motion vector predictor according to the present invention comprises the steps of: selecting a reference picture for a current block; deciding a predictor block corresponding to a predetermined storage unit block, as a reference prediction unit for the current block, in the reference picture; and deriving the temporal motion vector predictor from motion information of the decided reference prediction unit. The present invention enhances image compression efficiency.

公开(公告)号：US11438579B2

公开(公告)日：2022-09-06

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 Lim ,  Jangwon Choi ,  Jungah Choi

IPC: H04N19/132 ,  H04N19/105 ,  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：US11425421B1

公开(公告)日：2022-08-23

申请号：US17337148

申请日：2021-06-02

Applicant: LG Electronics Inc.

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

IPC: H04N19/00 ,  H04N19/61 ,  H04N19/18 ,  H04N19/124 ,  H04N19/132 ,  H04N19/129 ,  H04N19/159 ,  H04N19/11 ,  H04N19/122 ,  H04N19/176

Abstract: An image decoding method according to the present specification comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficient for a target block; deriving modified transform coefficients on the basis of inverse reduced secondary transform (RST) of the transform coefficients; and generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the step of deriving the modified transform coefficients is characterized in deriving 16 modified transform coefficients by applying a transform kernel matrix to 8 transform coefficients in a 4×4 region of the target block.

公开(公告)号：US11412242B2

公开(公告)日：2022-08-09

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 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

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：US11356702B2

公开(公告)日：2022-06-07

申请号：US15734806

申请日：2019-06-07

Applicant: LG ELECTRONICS INC.

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

IPC: 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：US20220132146A1

公开(公告)日：2022-04-28

申请号：US17568322

申请日：2022-01-04

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/18 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/60 ,  H04N19/91

Abstract: An image information decoding method performed by means of a decoding device according to the present invention comprises the steps of: decoding a non-separable secondary transform (NSST) index from a bitstream if NSST is applied to a target block; decoding information relating to transform coefficients with respect to the target block from the bitstream on the basis of the decoded NSST index; and deriving the transform coefficients with respect to the target block on the basis of the decoded information relating to the transform coefficients, wherein the NSST index is decoded prior to the information relating to the transform coefficients with respect to the target block.