Mesh Decoding Lifting Parameters for Low-Overhead LoD Updates
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Solution Overview
Problem
Existing video-based coding of dynamic meshes in extended reality applications faces challenges in efficiently signaling displacement vectors without significantly increasing signaling overhead, limiting flexibility in updating lifting transform parameters.
Innovation Solution
The technique involves receiving flags to determine whether lifting transform parameters should be updated or not, and signaling them at a level of detail (LoD) level, allowing for flexible updates without increasing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lifting transform parameters are updated frequently to maintain mesh quality, then mesh decoding flexibility is improved, but signaling overhead increases
Solution Approach 1:
The system dynamically determines whether to signal lifting transform parameters at LoD level based on the first flag value. When the first flag indicates parameters should be updated, the system checks the second flag to decide whether to signal at LoD level or use inherited parameters, creating a dynamic adaptive signaling mechanism that balances flexibility and overhead
Solution Approach 2:
The system changes the signaling behavior based on flag parameter values. By interpreting different combinations of first and second flag values, the system adjusts whether lifting parameters are signaled at LoD level or inherited from parent nodes, effectively changing the parameter signaling strategy to minimize overhead while maintaining update flexibility
2Measurement precision
If lifting transform parameters are signaled at LoD level for each mesh detail, then decoding precision is improved, but signaling overhead increases
Solution Approach 1:
The system applies different signaling quality at different LoD levels based on the second flag. At higher LoD levels where precision is critical, the system may signal lifting parameters explicitly, while at lower LoD levels where inheritance suffices, it skips signaling to reduce overhead, creating local quality differentiation in the signaling process
Solution Approach 2:
The system uses partial signaling by only signaling lifting parameters at LoD levels where necessary (when the second flag indicates so), rather than always signaling at every level. This partial action approach maintains sufficient precision for critical levels while avoiding excessive signaling overhead at levels where inherited parameters are adequate
Data Source
AI summary
A device for decoding encoded mesh data is configured to receive a first flag, wherein a first value of the first flag indicates lifting transform parameters are to be updated and a second value for the flag indicates the lifting transform parameters are not to be updated; receive a second flag in response to the first flag being equal to the first value, wherein a first value for the second flag indicates lifting transform parameters are signaled at a level of detail (LoD) level and a second value for the second flag indicates the lifting transform parameters are not signaled at the LoD level; update the lifting transform parameters in response to the second flag being equal to the second value; determine updated lifting transform parameters based on the lifting transform parameters; and determine displacement vectors based on the updated lifting transform parameters.