3D Point Cloud Attribute Encoding via Difference Value Segmentation

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Solution Overview

Problem

There is a demand to improve coding efficiency in three-dimensional data encoding processes, particularly in representing and transmitting point cloud data.

Innovation Solution

A three-dimensional data encoding method that calculates difference values between attribute information of three-dimensional points and predicted values, and then generates a second code sequence including information about consecutive zero difference values and non-zero difference values, to reduce code amount and enhance coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional point cloud encoding methods are used, then the encoding process is simple, but the coding efficiency is low and the code amount is large

Engineering Contradiction:

Improvecoding efficiencyVSAvoidcode amount

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the encoding process into multiple stages: first encoding geometric information, then encoding attribute information separately. Within attribute encoding, it further segments by processing difference values in blocks and applying different encoding strategies to zero and non-zero difference values, thereby improving coding efficiency through structured division of the encoding task

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes parameters by using difference values instead of original attribute values for encoding. It calculates difference values between current point attributes and predicted attributes, then encodes these differences. This parameter transformation reduces the amount of information that needs to be transmitted while maintaining reconstruction accuracy

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If all difference values are encoded individually, then the decoding process is simple, but the code amount increases significantly

Engineering Contradiction:

Improvecode amountVSAvoidencoding complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent merges consecutive zero difference values into a single encoded unit by recording their count as a parameter. Instead of encoding each zero difference value separately, it combines them into one entry with a counter, significantly reducing the code amount while maintaining the ability to reconstruct the original sequence

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts and separately handles zero difference values from non-zero difference values. It identifies consecutive zero difference values and processes them as a distinct category, applying specialized encoding (count-based representation) that is different from how non-zero values are encoded, thereby optimizing the overall code efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250184533A1Three-dimensional data encoding method, three-dimensional data decoding method, three-dimensional data encoding device, and three-dimensional data decoding device

Publication Date: 2025.06.05 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A three-dimensional data encoding method includes: calculating difference values each of which is a difference between (i) a corresponding one of pieces of attribute information of three-dimensional points included in point cloud data and (ii) a predicted value corresponding to the corresponding attribute information; generating a second code sequence including first information and a second information, the first information indicating a total number of zero difference values consecutive in a first code sequence in which the difference values are arranged, the second information indicating a value of a non-zero difference value included in the difference values, the zero difference values being included in the difference values and having a value of 0; and generating a bitstream including the second code sequence.