Reverse Edgebreaker Coding for Faster Triangular Mesh Decoding
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Solution Overview
Problem
Existing mesh encoding and decoding technologies, particularly those using Edgebreaker technology, face inefficiencies in handling large meshes with regular topology, especially in terms of compression performance and decoding speed, and require complex handling of virtual points and table restarts.
Innovation Solution
A reverse version of Edgebreaker coding is implemented to simplify the decoding process by eliminating the need for virtual points and table restarts, optimizing table consumption, and improving memory coherency and caching, while supporting attribute prediction and arithmetic coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If forward Edgebreaker decoding is used, then the mesh topology can be reconstructed, but the decoding process requires virtual points and table restarts which increases complexity and reduces speed
Solution Approach 1:
The patent applies reverse Edgebreaker decoding instead of forward decoding. By inverting the decoding direction and using reverse traversal of the CLERS table, the method eliminates the need for virtual points and table restarts that plague forward decoding approaches. This inversion fundamentally simplifies the decoding process while improving speed.
2Loss of information
If traditional Edgebreaker implementation is used, then mesh encoding can be performed, but compression performance is suboptimal for large meshes with regular topology
Solution Approach 1:
The patent uses reverse Edgebreaker encoding which traverses the mesh in reverse order. This reverse traversal pattern is particularly effective for large meshes with regular topology, achieving up to 6% better compression performance by more efficiently capturing the regular patterns in the mesh data.
3Reliability
If forward traversal is used for attribute decoding, then attributes can be reconstructed, but memory coherency and caching are not optimized
Solution Approach 1:
The patent employs reverse traversal for attribute decoding instead of forward traversal. This reverse traversal order optimizes memory coherency and caching behavior by accessing memory in a pattern that better utilizes CPU caches, reducing memory access latency and improving overall encoding/decoding efficiency.
Data Source
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AI summary
Systems and methods for reverse edgebreaker coding of triangular mesh information. A mesh decoding method according to some embodiments comprises: obtaining from a bitstream a CLERS table representing an edgebreaker encoding of a topology of a triangular mesh; reconstructing the topology of the triangular mesh using a reverse traversal of the CLERS table; creating a first ordered table of corners of the triangular mesh representing an order of corners traversed during the reverse traversal of the CLERS table; obtaining from the bitstream ordered attribute information representing attributes of respective faces or vertices in the triangular mesh; and reconstructing the attributes of the respective faces or vertices using the attribute information and a forward iteration over the first ordered table of corners.