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：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：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：US20180288411A1

公开(公告)日：2018-10-04

申请号：US15764230

申请日：2016-09-29

Applicant: LG Electronics Inc. ,  UNIVERSITY OF SOUTHERN CALIFORNIA

Inventor： Hilmi E. EGILMEZ ,  Sehoon YEA ,  Antonio ORTEGA ,  Onur G. GULERYUZ ,  Jana EHMANN

IPC: H04N19/11 ,  H04N19/13 ,  H04N19/134

Abstract: The present invention provides a method for encoding a video signal by using a single optimized graph, comprising the steps of: obtaining a residual block; generating graphs from the residual block; generating an optimized graph and an optimized transform by combining the graphs, wherein the graphs are combined on the basis of an optimization step; and performing a transform for the residual block on the basis of the optimized graph and the optimized transform.

公开(公告)号：US20230345016A1

公开(公告)日：2023-10-26

申请号：US18134110

申请日：2023-04-13

Applicant: KDDI Research, Inc. ,  University of Southern California

Inventor： Shashank Nelamangala SRIDHARA ,  Eduardo Hernan Pavez CARVELLI ,  Antonio ORTEGA ,  Ryousuke WATANABE ,  Keisuke NONAKA ,  Kyouhei UNNO

IPC: H04N19/186

CPC classification number: H04N19/186

Abstract: Encoding efficiency for attribute information in point cloud information is improved.
A point cloud encoding device includes a subsampling unit configured to preserve chroma signals of some points in a point cloud to be encoded and discard chroma signals of remaining points other than those points, and an attribute information encoding unit configured to encode the chroma signals of those points in the point cloud to be encoded and luma signals of all points.

公开(公告)号：US20230342982A1

公开(公告)日：2023-10-26

申请号：US18097703

申请日：2023-01-17

Applicant: KDDI Research, Inc. ,  University of Southern California

Inventor： Haoran HONG ,  Eduardo Hernan Pavez CARVELLI ,  Antonio ORTEGA ,  Ryousuke WATANABE ,  Keisuke NONAKA ,  Kyouhei UNNO

IPC: G06T9/00 ,  G06T3/40 ,  G06T7/246

CPC classification number: G06T9/001 ,  G06T3/4007 ,  G06T7/251

Abstract: A point cloud coding device includes an interpolation unit configured to perform an interpolation process on a reconstructed point cloud of a coded frame with respect to attribute information in point cloud information and generating a reference frame of fractional precision, a motion estimation unit configured to perform motion estimation between the reference frame of fractional precision and the frame of integer precision to generate motion information, a prediction unit configured to generate a predicted value on the basis of the motion information, and an entropy coding unit configured to entropy-code the difference between a point cloud of the frame and the predicted value.