V-DMC Displacement Signalling With Fixed-Point Inverse Quantization
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Solution Overview
Problem
Existing video-based coding of dynamic meshes in V-DMC relies on the arithmetic-coded displacement sub-bitstream for reconstructing displacement vector wavelet coefficients, which does not contain necessary parameters for inverse quantization, necessitating reliance on the atlas metadata sub-bitstream, limiting self-contained reconstruction.
Innovation Solution
Determine a quantization parameter based on syntax elements within the displacement sub-bitstream to enable self-contained reconstruction of displacement vectors without relying on other sub-bitstreams, using fixed-point inverse quantization and transformation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arithmetic-coded displacement sub-bitstream is used for reconstructing displacement vector wavelet coefficients, then the reconstruction process can be performed, but the sub-bitstream does not contain necessary parameters for inverse quantization, requiring reliance on the atlas metadata sub-bitstream and limiting self-contained reconstruction
Solution Approach 1:
The patent merges the quantization parameter information into the displacement sub-bitstream by signaling QP values through syntax elements. This combines previously separate data requirements (displacement coefficients and quantization parameters) into a single self-contained sub-bitstream, eliminating the need to rely on the atlas metadata sub-bitstream for reconstruction.
Solution Approach 2:
The displacement sub-bitstream is enhanced to include all necessary information for independent reconstruction of displacement vectors. By embedding quantization parameters within the sub-bitstream itself through syntax elements, the system enables self-service reconstruction without external dependencies on other sub-bitstreams.
2Adaptability or versatility
If fixed-point inverse quantization is used with quantization parameters from the displacement sub-bitstream, then self-contained reconstruction is enabled, but additional syntax elements must be included in the sub-bitstream
Solution Approach 1:
The patent changes the parameter representation by signaling quantization parameters (QP) as syntax elements within the displacement sub-bitstream. This allows the sub-bitstream to be self-contained while managing data volume through efficient parameter encoding that adapts to the specific displacement data being encoded.
3Reliability
If quantization parameters are signaled in the displacement sub-bitstream, then self-contained reconstruction is achieved, but the sub-bitstream structure becomes more complex
Solution Approach 1:
The patent segments the displacement encoding information into distinct components: displacement coefficients and quantization parameters (QP). By organizing these elements separately within the sub-bitstream with clear syntax structures, the system achieves self-contained reconstruction while maintaining manageable structural complexity through systematic segmentation.
Data Source
AI summary
A device for decoding encoded dynamic mesh data determines a set of quantized integer coefficient values for displacement vectors of the encoded dynamic mesh data; determines a quantization parameter based on one or more syntax elements included in a displacement sub-bitstream of the encoded dynamic mesh data; inverse quantizes, based on the quantization parameter, the set of quantized integer coefficient values to determine a set of fixed-point dequantized coefficient values; determines a set of fixed-point transformed coefficient values based on the set of fixed-point dequantized coefficient values; converts the set of fixed-point transformed coefficient values to a set of floating-point transformed coefficient values; inverse transforms the set of floating-point transformed coefficient values to determine a set of reconstructed displacement vectors; and determines a reconstructed deformed mesh based on the set of reconstructed displacement vectors.