公开(公告)号：US20180146195A1

公开(公告)日：2018-05-24

申请号：US15577029

申请日：2016-05-26

Applicant: LG Electronics Inc. ,  University of Southern California

Inventor： Moonmo KOO ,  Sehoon YEA ,  Bumshik LEE ,  Amir SAID ,  Hilmi Enes EGILMEZ ,  Antonio ORTEGA

IPC: H04N19/122 ,  H04N19/625 ,  H04N19/61 ,  H04N19/176

Abstract: The present invention provides a method for decoding a video signal using an adaptive separable graph-based transform, comprising the steps of: receiving a transform index for a target block from the video signal, wherein the transform index indicates a graph-based transform to be applied to the target block; deriving a graph-based transform kernel corresponding to the transform index; and decoding the target block based on the graph-based transform kernel.

公开(公告)号：US20210243441A1

公开(公告)日：2021-08-05

申请号：US16074372

申请日：2017-02-01

Applicant: LG ELECTRONICS INC. ,  UNIVERSITY OF SOUTHERN CALIFORNIA

Inventor： Hilmi E. EGILMEZ ,  Yung-Hsuan CHAO ,  Antonio ORTEGA ,  Bumshik LEE ,  Sehoon YEA

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/159 ,  H04N19/61

Abstract: The present invention provides a method for encoding a video signal on the basis of a graph-based separable transform (GBST), the method comprising the steps of: generating an incidence matrix representing a line graph; training a sample covariance matrix for rows and columns from the rows and columns of a residual signal; calculating a graph Laplacian matrix for rows and columns on the basis of the incidence matrix and the sample covariance matrix for rows and columns; and obtaining a GBST by performing eigen decomposition of the graph Laplacian matrix for rows and columns.

公开(公告)号：US20210227261A1

公开(公告)日：2021-07-22

申请号：US16074265

申请日：2017-02-01

Applicant: LG ELECTRONICS INC. ,  UNIVERSITY OF SOUTHERN CALIFORNIA

Inventor： Yung-Hsuan CHAO ,  Hilmi E. EGILMEZ ,  Antonio ORTEGA ,  Sehoon YEA ,  Bumshik LEE

IPC: H04N19/61 ,  H04N19/14 ,  H04N19/13 ,  H04N19/182 ,  H04N19/124 ,  H04N19/107

Abstract: The present invention provides a method for encoding a video signal based on an Edge Adaptive Graph-Based Transform (EA-GBT) including detecting a step edge or a ramp edge from a residual signal; generating a graph signal based on at least one of the step edge or the ramp edge; obtaining an EA-GBT coefficient by performing the EA-GBT for the graph signal; quantizing the EA-GBT coefficient; and entropy-encoding the quantized EA-GBT coefficient.

公开(公告)号：US20190306511A1

公开(公告)日：2019-10-03

申请号：US16306837

申请日：2016-06-03

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Bumshik LEE

IPC: H04N19/159 ,  H04N19/132 ,  H04N19/105 ,  H04N19/46 ,  H04N19/124 ,  H04N19/33 ,  H04N19/176

Abstract: An intra-prediction method according to the present invention comprises the steps of: obtaining information on an intra-prediction mode from a bitstream; determining an intra-prediction mode for a current block on the basis of the information on the intra-prediction mode; determining whether to apply coefficient induced intra-prediction (CIIP) to the current block; deriving neighboring samples of the current block on the basis of the determination of whether to apply the CIIP; and generating predicted samples of the current block on the basis of the intra-prediction mode and the neighboring samples. According to the present invention, corrected or improved neighboring samples can be generated, whereby intra-prediction performance can be improved.

公开(公告)号：US20180213233A1

公开(公告)日：2018-07-26

申请号：US15744665

申请日：2016-07-15

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Bumshik LEE ,  Sehoon YEA ,  Kyuwoon KIM

IPC: H04N19/146 ,  H04N19/124 ,  H04N19/91 ,  H04N19/159 ,  H04N19/80

CPC classification number: H04N19/146 ,  H04N19/12 ,  H04N19/124 ,  H04N19/14 ,  H04N19/147 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/513 ,  H04N19/80 ,  H04N19/91

Abstract: The present invention provides a method for decoding a video signal by using a graph-based transform, comprising the steps of: parsing a transform index from the video signal; generating a line graph on the basis of edge information on a target unit; aligning transform vectors for each of segments of the line graph on the basis of a transform type corresponding to the transform index; acquiring a transform kernel by realigning the transform vectors for each of segments of the line graph according to a predetermined condition; and performing an inverse transform for the target unit on the basis of the transform kernel.

公开(公告)号：US20180167618A1

公开(公告)日：2018-06-14

申请号：US15579353

申请日：2016-06-07

Applicant: LG Electronics Inc.

Inventor： Bumshik LEE ,  Sehoon YEA ,  Moonmo KOO

IPC: H04N19/14 ,  H04N19/176 ,  H04N19/60 ,  H04N19/105 ,  H04N19/124

CPC classification number: H04N19/14 ,  H04N19/105 ,  H04N19/12 ,  H04N19/124 ,  H04N19/176 ,  H04N19/60

Abstract: The present invention provides a method for decoding a video signal using a graph-based transform including receiving, from the video signal, a transform index for a target block; deriving a graph-based transform kernel corresponding to the transform index, and the graph-based transform kernel is determined based on boundary information, which represents a property of a signal for a block boundary; and decoding the target block based on the graph-based transform kernel.

公开(公告)号：US20200322604A1

公开(公告)日：2020-10-08

申请号：US16627107

申请日：2018-06-28

Applicant: LG ELECTRONICS INC.

Inventor： Bumshik LEE ,  Moonmo KOO ,  Jaehyun LIM

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625

Abstract: The present disclosure relates to a method for processing a video signal by using a linear relationship between transform types, comprising the steps of: determining a transform group on the basis of a prediction mode of a current block; parsing a transform combination index from a video signal, wherein the transform combination index indicates anyone of a plurality of transform combinations in the transform group; deriving a transform combination corresponding to the transform combination index, wherein the transform combination consists of a horizontal transform and a vertical transform, and includes DST-7 or DCT-8; performing inverse transform on the current block on the basis of the transform combination; and restoring the video signal by using the inverse transformed current block.

公开(公告)号：US20180115787A1

公开(公告)日：2018-04-26

申请号：US15565823

申请日：2016-04-12

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Sehoon YEA ,  Kyuwoon KIM ,  Bumshik LEE

IPC: H04N19/593 ,  H04N19/124 ,  H04N19/182 ,  H04N19/61

CPC classification number: H04N19/593 ,  H04N19/124 ,  H04N19/182 ,  H04N19/61 ,  H04N19/62

Abstract: The present invention provides a method for encoding a video signal, comprising: generating prediction pixels for the first row or column of a current block on the basis of boundary pixels neighboring to the current block; predicting remaining pixels within the current block respectively in the vertical direction or horizontal direction using the prediction pixels for the first row or column of the current block; generating a difference signal on the basis of the prediction pixels for the current block; and generating a transform-coded residual signal by applying a horizontal transform matrix and a vertical transform matrix to the difference signal.

公开(公告)号：US20180343455A1

公开(公告)日：2018-11-29

申请号：US15775307

申请日：2016-11-11

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Bumshik LEE ,  Sehoon YEA

IPC: H04N19/18 ,  H04N19/159 ,  H04N19/176 ,  H04N19/124 ,  H04N19/44

Abstract: An intra prediction method according to the present invention comprises the steps of: determining an intra prediction mode for a current block; determining whether to apply a coefficient induced intra prediction (CIIP) to the current block; deriving neighboring reference samples for the current block on the basis of whether the CIIP is applied; and generating prediction samples for the current block on the basis of the intra prediction mode and the neighboring samples. The present invention can generate modified or improved neighboring reference samples and thereby can improve the performance of intra prediction.

公开(公告)号：US20180288407A1

公开(公告)日：2018-10-04

申请号：US15758920

申请日：2016-09-12

Applicant: LG ELECTRONICS INC.

Inventor： Bumshik LEE ,  Sehoon YEA ,  Moonmo KOO

IPC: H04N19/105 ,  H04N19/107 ,  H04N19/122 ,  H04N19/176 ,  H04N19/182 ,  H04N19/18 ,  H04N19/61

CPC classification number: H04N19/105 ,  H04N19/107 ,  H04N19/11 ,  H04N19/12 ,  H04N19/122 ,  H04N19/134 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/182 ,  H04N19/463 ,  H04N19/61 ,  H04N19/90 ,  H04N19/91

Abstract: A method of encoding a video signal using a graph-based transformation includes: generating a residual block using a prediction block generated according to an intra prediction mode; obtaining at least one of a self-loop weight indicating a weight of boundary pixels in the residual block or a correlation coefficient indicating an inter-pixel correlation, on the basis of a prediction angle corresponding to the intra prediction mode; generating a graph on the basis of at least one of the self-loop weight or the correlation coefficient; determining a graph-based transformation kernel on the basis of the graph; and performing a transform for the residual block using the graph-based transformation kernel.