公开(公告)号：US20220329783A1

公开(公告)日：2022-10-13

申请号：US17843872

申请日：2022-06-17

Applicant: LG ELECTRONICS INC.

Inventor： Seethal Paluri ,  Hendry Hendry ,  Jie Zhao ,  Seunghwan Kim

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176 ,  H04N19/70 ,  H04N19/46

Abstract: A video decoding method performed by a video decoding device according to this document comprises the steps of: parsing prediction weighted table syntax from a bitstream; parsing information on the number of reference pictures in a reference picture list from the prediction weighted table syntax; deriving weights for weighted prediction on the basis of the information on the number of reference pictures; deriving prediction samples of a current block by performing weighted prediction for the current block on the basis of the weights; and reconstructing a current picture on the basis of the prediction samples, wherein the prediction weighted table syntax may be parsed from a picture header of the bitstream.

公开(公告)号：US11463719B2

公开(公告)日：2022-10-04

申请号：US17400718

申请日：2021-08-12

Applicant: LG Electronics Inc.

Inventor： Sunmi Yoo ,  Jungah Choi ,  Seunghwan Kim

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

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：US11457221B2

公开(公告)日：2022-09-27

申请号：US17526940

申请日：2021-11-15

Applicant: LG ELECTRONICS INC.

Inventor： Mehdi Salehifar ,  Seunghwan Kim

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

Abstract: An image decoding method according to the present document can comprise the steps of: receiving flag information indicating whether a matrix-based intra prediction (MIP) is used with respect to a current block; receiving matrix-based intra prediction (MIP) mode information on the basis of the flag information; generating an intra prediction sample for the current block on the basis of the MIP mode information; and generating restoration samples for the current block on the basis of the intra prediction samples.

公开(公告)号：US11438630B2

公开(公告)日：2022-09-06

申请号：US17555200

申请日：2021-12-17

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon Jang ,  Naeri Park ,  Seunghwan Kim

IPC: H04N19/70 ,  H04N19/119 ,  H04N19/132 ,  H04N19/503 ,  H04N19/176 ,  H04N19/174 ,  H04N19/159

Abstract: A decoding method carried out by a decoding device, according to the present document, comprises the steps of: acquiring, from a bitstream, information associated with a prediction mode of a current block; deriving a prediction mode of the current block on the basis of the information associated with the prediction mode; deriving prediction samples of the current block on the basis of the prediction mode; and generating reconstructed samples on the basis of the prediction samples, wherein the bitstream comprises a sequence parameter set, the sequence parameter set comprising a combined inter-picture merge and intra-picture prediction (CIIP) enable flag, and the step for deriving may comprise a step for parsing a regular merge flag from the bitstream on the basis of the satisfying of a condition based on the CIIP enable flag and a condition based on the size of the current block.

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：US20220272350A1

公开(公告)日：2022-08-25

申请号：US17737806

申请日：2022-05-05

Applicant: LG ELECTRONICS INC.

Inventor： Seethal Paluri ,  Hendry Hendry ,  Seunghwan Kim ,  Jie Zhao

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/174 ,  H04N19/70

Abstract: A video decoding method performed by a video decoding apparatus, according to the present document, comprises the steps of: obtaining image information from a bitstream, wherein the image information includes a picture header associated with a current picture, and the current picture includes a plurality of slices; parsing at least one of a first flag and a second flag from the picture header; generating prediction samples by performing at least one of intra prediction and inter prediction on a current block in the current picture on the basis of at least one of the first flag and the second flag; generating reconstructed samples on the basis of the prediction samples; and generating a reconstructed picture on the basis of the reconstructed samples.

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.