Symmetry Mesh UV Quantization with Reparameterized Half-Mesh Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for compressing meshes, such as VMesh, do not effectively utilize global characteristics like symmetry, particularly in UV attributes, leading to inefficiencies in quantization and reparameterization for lossy and lossless compression.
Innovation Solution
A method involving extracting a half symmetry mesh, quantizing it at a first bitdepth, reparameterizing to reduce empty spaces, and then quantizing again at a different bitdepth to generate a final quantized mesh for encoding, while maintaining the associated texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UV attributes are quantized directly without reparameterization, then the quantization process is simple and fast, but quantization error is high and compression efficiency is poor
Solution Approach 1:
The patent applies preliminary reparameterization to the UV attributes before quantization. This preliminary action transforms the UV coordinates to reduce empty spaces and optimize the distribution of UV values, which subsequently enables more efficient quantization with lower quantization error and better compression performance.
2Productivity
If symmetry-based compression is applied to meshes, then compression efficiency improves, but loss of global characteristics like symmetry is not utilized
Solution Approach 1:
The patent extracts and utilizes the symmetry characteristic from the mesh by separating the mesh into symmetric and asymmetric parts. The symmetric parts are encoded using symmetry-based prediction, while only the asymmetric parts require full encoding. This extraction of symmetry information enables efficient compression while preserving global symmetry characteristics.
3Reliability
If UV reparameterization is performed without modifying the associated texture, then the texture remains intact, but the UV map structure changes requiring careful handling
Solution Approach 1:
The patent segments the UV attribute data from the texture data. The UV coordinates are reparameterized to optimize compression, while the texture itself remains unchanged. This segmentation allows independent optimization of UV mapping and texture storage, maintaining texture integrity while improving compression efficiency through UV reparameterization.
Data Source
AI summary
A method performed by an encoder comprises extracting from an input mesh an extracted half symmetry mesh, the input mesh comprising a first side and a second side, the second side being opposite to the first side, the extracted mesh comprising only one of the first side and the second side; quantizing the extracted half symmetry mesh at a first bitdepth to generate a first quantized mesh; reparameterizing the first quantized mesh to generate a reparameterized mesh that includes a reduction in one or more empty spaces in the first quantized mesh; quantizing the reparameterized mesh at a second bitdepth different from the first bitdepth to generate a second quantized mesh; and encoding the second quantized mesh into a bitstream.