Frame-Specific Attribute Parameter Coding for Point Cloud Compression

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Solution Overview

Problem

Existing point cloud compression techniques lack flexibility in setting attribute parameters specific to each frame, leading to suboptimal reconstruction of attribute values across multiple frames, and are limited by requiring attribute parameters to be power of two values.

Innovation Solution

The proposed solution involves signaling and parsing attribute parameters in a syntax structure specific to each frame, allowing for flexible setting of parameters and enabling fractional values, which are applicable to multiple points in the point cloud, and allowing these parameters to be signaled anywhere in the bitstream.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If attribute parameters are signaled in a parameter set that applies to multiple frames, then compression efficiency is improved through parameter reuse, but the flexibility to set frame-specific attribute parameters is lost

Engineering Contradiction:

Improvecompression efficiencyVSAvoidframe-specific parameter flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the parameter signaling into two distinct locations: a parameter set that applies to multiple frames for efficiency, and a frame-specific syntax structure for flexibility. This segmentation allows the system to achieve both compression efficiency through parameter reuse and frame-specific customization where needed, resolving the contradiction between these two requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic adaptability by allowing the syntax structure to be selectively applied based on frame-specific requirements. The system can dynamically choose to use shared parameter sets or frame-specific syntax structures depending on the encoding needs, enabling flexible adaptation between compression efficiency and customization requirements.

Inventive Principle:

Principle #15Dynamics

2Ease of manufacture

If attribute parameters are limited to power of two values, then encoding simplicity is maintained, but the range of representable attribute values is reduced

Engineering Contradiction:

Improveencoding simplicityVSAvoidattribute value representation range

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter type from restricted power-of-two values to fractional values, expanding the representable range of attribute parameters. This parameter change enables more precise and versatile attribute value representation while maintaining encoding efficiency through the fractional notation system, resolving the contradiction between simplicity and representation range.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12026922B2Attribute parameter coding for geometry-based point cloud compression

Publication Date: 2024.07.02 QUALCOMM INC

AI summary

An example method of encoding a point cloud includes determining one or more attribute parameters of an attribute of a point in the point cloud of a frame, wherein the one or more attribute parameters define how to determine or use a value of the attribute and are applicable to a plurality of points in the point cloud; and signaling, in a bitstream indicative of the point cloud, the one or more attribute parameters in a syntax structure that is specific to the frame.