Patch-Adaptive Mesh Decoding for Lower Displacement Bit Counts

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Solution Overview

Problem

Existing mesh decoding methods fail to adequately account for the characteristics of individual patches, leading to inefficiencies in bit usage.

Innovation Solution

A mesh decoding device and method that adaptively adjusts the subdivision method and inverse quantization based on patch-specific information, reducing the number of bits required for decoding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single decoding method is used for all patches, then the device complexity is reduced, but the adaptability to different mesh characteristics is insufficient

Engineering Contradiction:

Improveadaptability to mesh characteristicsVSAvoiddecoding method complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by enabling different decoding methods (first and second decoding methods) to be selectively applied to different patches based on their specific characteristics. Each patch can be decoded using the method best suited to its properties, rather than forcing a uniform approach across all patches. This resolves the contradiction by allowing adaptability at the patch level while maintaining a manageable overall system structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making the decoding method selectable and changeable based on patch characteristics. The system can dynamically choose between the first decoding method and the second decoding method depending on the specific patch being processed. This dynamic selection capability provides adaptability without requiring a completely complex fixed structure, as the system flexes its approach to match the content.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If more parameter types are designated for each patch, then the adaptability to mesh characteristics improves, but the number of bits for displacement increases

Engineering Contradiction:

Improvedecoding suitability for mesh characteristicsVSAvoidnumber of bits

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by utilizing different quantization parameters (first quantization parameter and second quantization parameter) corresponding to different decoding methods. By changing the quantization parameter based on the selected decoding method and patch characteristics, the system achieves adaptive decoding while controlling the bit count. This resolves the contradiction by allowing parameter flexibility without proportionally increasing data size.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250218047A1Mesh decoding device, mesh decoding method, and program

Publication Date: 2025.07.03 KDDI CORP

AI summary

The present invention enables setting of a decoding method according to characteristics of a mesh in a patch and can reduce the number of bits of a displacement. A mesh decoding device 200 according to the present invention includes a circuit, wherein the circuit: decodes an atlas bit stream and output patch information and frame information; changes a subdivision method based on the patch information and the frame information; and changes an inverse quantization method based on the patch information.