3D Attribute Bitstream Control for Accurate Point Cloud Decoding

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Solution Overview

Problem

Existing methods for encoding and decoding three-dimensional data, particularly point cloud data, fail to accurately decode attribute information of three-dimensional points, leading to inefficiencies in data transmission and processing.

Innovation Solution

A method and device for encoding and decoding three-dimensional data that includes encoding attribute information using parameters, generating a bitstream with control information and identification information to correctly identify and decode attribute information of three-dimensional points, reducing data volume through efficient encoding and decoding processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If attribute information of three-dimensional points is encoded using parameters, then coding efficiency is improved, but accurate decoding of attribute information becomes difficult

Engineering Contradiction:

Improvecoding efficiencyVSAvoiddecoding accuracy of attribute information

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the bitstream into multiple sections, with control information separating parameter settings from actual attribute data. This segmentation allows the decoder to correctly interpret attribute information by first loading parameters from control information, then using those parameters to accurately decode the attribute data section, thus resolving the contradiction between compression efficiency and decoding accuracy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces control information as an intermediary between the encoded attribute data and the decoder. This control information contains parameter settings that mediate the decoding process, enabling the decoder to correctly interpret compressed attribute information without losing accuracy, thus solving the problem of maintaining decoding precision while improving coding efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If data volume is reduced through encoding, then transmission requirements are lowered, but correct identification of attribute information types becomes difficult

Engineering Contradiction:

Improvedata volumeVSAvoidattribute information type identification

Core Design Contradiction:

Quantity of substanceVSLoss of information

Solution Approach 1:

The patent performs preliminary action by placing control information containing parameter settings before the actual attribute data in the bitstream. This preliminary control information establishes the context needed for correct interpretation of subsequent attribute data, enabling the decoder to identify attribute information types accurately even after compression, thus resolving the contradiction between data volume reduction and information preservation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4651495A1Three-dimensional data encoding method, three-dimensional data decoding method, three-dimensional data encoding device, and three-dimensional data decoding device

Publication Date: 2025.11.19 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

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AI summary

A three-dimensional data encoding method includes: encoding pieces of attribute information of respective three-dimensional points, using parameters (S6701); and generating a bitstream including the pieces of attribute information encoded, control information, and pieces of first attribute control information (S6702). The control information corresponds to the pieces of attribute information and includes pieces of type information each indicating a type of different attribute information, the pieces of first attribute control information correspond one-to-one with the pieces of attribute information, and each of the pieces of first attribute control information includes first identification information indicating that the first attribute control information is associated with one of the pieces of type information.