V-DMC Mesh Parameter Overrides for Lower Bitstream Signaling
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Solution Overview
Problem
Existing video-based coding technologies for dynamic meshes, such as those standardized in MPEG WG7 (3DGH), suffer from high signaling overhead due to the need to repeatedly signal transform and quantization parameters, which hampers compression efficiency.
Innovation Solution
The proposed solution involves inferring syntax element values based on the overriding of transform and quantization parameters, allowing for reduced signaling overhead by determining the presence or absence of these parameters in the bitstream, thereby improving compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transform parameters and quantization parameters are repeatedly signaled in the bitstream, then decoding accuracy is maintained, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential parameter information needed for decoding by using override flags to indicate whether parameters are present or should be inferred from default values. Instead of signaling all parameters explicitly, the system extracts and transmits only those that differ from defaults or are overridden, reducing bitstream overhead while maintaining decoding accuracy.
Solution Approach 2:
The patent inverts the traditional signaling approach by using the absence of certain syntax elements or override flags to indicate parameter presence. Rather than explicitly signaling all parameters, the system uses inferred values when override flags are not set, effectively signaling parameters through their absence or default state, thereby reducing signaling overhead.
2Manufacturing precision
If all transform and quantization parameters are explicitly signaled, then parameter precision is maintained, but compression efficiency decreases
Solution Approach 1:
The patent applies local quality by allowing different parameter signaling strategies for different regions or patches within the mesh data. Override flags enable selective signaling where parameters are explicitly transmitted only when needed in specific local regions, while other regions use inferred or default values, maintaining parameter precision where necessary while improving overall compression efficiency.
Solution Approach 2:
The patent implements partial signaling by transmitting only a subset of parameters explicitly through override flags and syntax elements, rather than signaling all parameters. This partial action approach maintains sufficient parameter precision for accurate decoding while reducing the total amount of data transmitted, thereby improving compression efficiency.
Data Source
AI summary
A device for decoding a bitstream of encoded mesh data is configured to in response to determining that first transform parameters are overridden, infer a value of a second syntax element to be equal to a first value indicating that second transform parameters are present in the bitstream of encoded mesh data; in response to the value of the second syntax element being equal to the first value, determine the second transform parameters from a second syntax structure; in response to determining that the first quantization parameters are overridden, infer a value of a third syntax element to be equal to a first value indicating that second quantization parameters are present in the bitstream of encoded mesh data; and in response to the value of the third syntax element being equal to the first value, determine second quantization parameters from a third syntax structure.