Progressive Geometry Compression
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Transcript of Progressive Geometry Compression
Progressive Geometry Compression
Zhu Ping2006.12.06
Compression
Necessity:
1. Storage;
2. Transmission
Base: Information Theory
Coding Techniques
Huffman coding Arithmetic coding VQ coding LZW coding
Geometry Compression Geometry Compression. Siggraph 95
Michael Deering Sun Microsystems an engineer in Java 3D API Interest:virtual reality
1. Vertice buffer
2. Old vertice
3. New vertice
Cost: 1. Mesh Buffer 2. Push Selected(one more bit) 3. Reuse Vertice from Buffer
Progressive Mesh Progressive Mesh. Siggraph 96 Huges Hoppe. Progressive Procession:
Mn Mn-1+Wn
Mn-1 predition P Wn
Mn=Mn-1+(P(Mn-1)+wn)) {M0,wn,…w1}
Progressive Compression of Arbitary Trianglar Meshes Progressive Compression of Arbitary Trianglar Mes
hes IEEE Visualization 99. Daniel Cohen-Or David Levin Offir Remez Levin:a professor inSchool of Mathematical Science
s Tel Aviv University,Israel Interest:Subdivision,Image Processing,CAGD, Computer Graphics
The 4-color encoding scheme
The 2-color encoding scheme
Codec Design
Input SN
eN 量化器 编码器eN’
预测器信道
解码器
预测器
发送端
输出
+ - +
+
eN’
SN‘
SN‘
接收端S’‘N
Mesh Optimization Mesh Optimization . Siggraph 93 Hugues Hoppe Tony DeRose Tom Duchamp Hoppe:a professor in University of
Washington,now in Graphics Group of Microsoft.
2 ACM TOGs in 06y 2 ACM TOGs in 05y
4 ACM TOGs in 04y Graphics Award in Siggrpah
Interest:Mesh Simplicial,Compression,Texture synthesis
Question: 网格优化:指作表面网格的优化,通过删除 和插入一些点,使得表面网格在曲率较大的 地方网格较密,光滑平坦处网格单元较大。 目的是合理布置网格的密度,提高单元格的质量。
Mesh Representation
Mesh Simplicial
Mesh Energy Function
Application : Surface Reconstruction ; Mesh Simplification
Geometric Compression For Interactive Transmission
Geometric Compression For Interactive Transmission.
IEEE Visualization 2000 Olivier Devillers Pierre-Marie Gandoin INRIA Sophia Antipolis ,France Overview: the topology of mesh can often be reconstructed from its vertices geometry-centric
Analysis
The cost of bits
Coding and Prediction
1. Arithmetric Coding 2. Prediction
Topology Coding
Experimental Results
Progressive Lossless Compression of Arbitrary Simplical Complexes Progressive Lossless Compression of Arbitrary Sim
plical Complexes. ACM TOG 2002 Pierre-Marie Gondoin Olivier Devillers
Related: [Devillers and Gandoin 2000] [Popovic and Hoppe 1997]
Geometry Driven Approach:kd-tree
Progressive Simplicial Complexes Jovan Popovic Hugues Hoppe Siggraph 97
Analysis:
Prediction
Results:
Future Work: Polygonal Meshes
Future Work: Polygonal Meshes
Thank You !!