Point cloud encoding device, point cloud decoding device, point cloud encoding method, point cloud decoding method, and program

Patent metadata

Field	Value
Publication number	US-12475641-B2
Application number	US-202318134110-A
Country	US
Kind code	B2
Filing date	Apr 13, 2023
Priority date	Apr 26, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

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.

First claim

What is claimed is:

1 . A point cloud decoding device, comprising:
a computer system; and a memory including a computer program that, when executed by the computer system, causes the computer system to perform functions, the functions including: three-dimensionally decoding chroma signals of some points and luma signals of all points in a reconstructed three-dimensional point cloud in a three-dimensional coordinate system reconstructed from a bitstream; and three-dimensionally interpolating chroma signals of a non-decoding target point, which is a point where chroma signals are not decoded in the three-dimensional reconstructed point cloud, based on the decoded chroma signals of K predetermined neighboring points of a decoding target point, which is a target point for decoding chroma signals.

2 . The point cloud decoding device according to claim 1 , wherein the computer system interpolates the chroma signals of the non-decoding target point using the decoded chroma signals of each of a predetermined number of the decoding target points present in a vicinity of the non-decoding target point,
the computer system calculates a value of the chroma signal for the point where the chroma signal has not been decoded by using predetermined K neighboring points where a chroma signal has been decoded for the point where the chroma signal has not been decoded to perform a weighted average on values of decoded chroma signals for the predetermined K neighboring points, and a weight of each of the predetermined K neighboring points in constructing a K-neighboring graph is determined based on a Gaussian function using an L2 distance between a corresponding point and a neighboring point of the corresponding point.

3 . The point cloud decoding device according to claim 1 , wherein the functions further include converting a luma signal and chroma signals of each point in the reconstructed three-dimensional point cloud into color information.

4 . A point cloud decoding method, comprising:
three-dimensionally decoding chroma signals of some points and luma signals of all points in a reconstructed three-dimensional point cloud in a three-dimensional coordinate system reconstructed from a bitstream; and three-dimensionally interpolating chroma signals of a non-decoding target point, which is a point where chroma signals are not decoded in the reconstructed three-dimensional point cloud, based on the decoded chroma signals of K predetermined neighboring points of a decoding target point, which is a target point for decoding chroma signals.

5 . A non-transitory computer-readable medium including a program for causing a computer, included in a point cloud decoding device, to execute:
three-dimensionally decoding chroma signals of some points and luma signals of all points in a reconstructed three-dimensional point cloud in a three-dimensional coordinate system reconstructed from a bitstream; and three-dimensionally interpolating chroma signals of a non-decoding target point, which is a point where chroma signals are not decoded in the reconstructed three-dimensional point cloud, based on the decoded chroma signals of K predetermined neighboring points of a decoding target point, which is a target point for decoding chroma signals.

Assignees

• Kddi Res Inc
• Univ Southern California

Inventors

• Sridhara Shashank Nelamangala
• Carvelli Eduardo Hernan Pavez
• Ortega Antonio
• Watanabe Ryousuke
• Nonaka Keisuke
• Unno Kyouhei

Classifications

• G06T17/005

  Tree description, e.g. octree, quadtree · CPC title

• H04N9/808

  involving pulse code modulation of the composite colour video-signal · CPC title

• H04N9/825

  the luminance and chrominance signals being recorded in separate channels · CPC title

• H04N9/77

  Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase (circuits for matrixing H04N9/67) · CPC title

• H04N9/64

  Circuits for processing colour signals (H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84) · CPC title