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Progressive Geometry Compression Zhu Ping 2006.12.06
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Compression Necessity: 1. Storage; 2. Transmission Base: Information Theory
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Coding Techniques Huffman coding Arithmetic coding VQ coding LZW coding
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Geometry Compression Geometry Compression. Siggraph 95 Michael Deering Sun Microsystems an engineer in Java 3D API Interest:virtual reality
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1.Vertice buffer 2.Old vertice 3.New vertice
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Cost: 1. Mesh Buffer 2. Push Selected(one more bit) 3. Reuse Vertice from Buffer
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Progressive Mesh Progressive Mesh. Siggraph 96 Huges Hoppe. Progressive Procession: M n M n-1 +W n M n-1 predition P W n M n= M n-1 +(P(M n-1 )+ w n )) {M 0,w n, … w 1 }
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Progressive Compression of Arbitary Trianglar Meshes IEEE Visualization 99. Daniel Cohen-Or David Levin Offir Remez Levin:a professor inSchool of Mathematical Sciences Tel Aviv University,Israel Interest:Subdivision,Image Processing,CAGD, Computer Graphics
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The 4-color encoding scheme
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The 2-color encoding scheme
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Codec Design Input S N eNeN 量化器编码器 eN’eN’ 预测器 解码器 预测器 发送端 输出 +- + + eN’eN’ SN‘SN‘ SN‘SN‘ 接收端 S ’‘ N
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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
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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。
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Mesh Representation
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Mesh Simplicial
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Mesh Energy Function
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Application : Surface Reconstruction ; Mesh Simplification
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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
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Analysis
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The cost of bits
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Coding and Prediction 1. Arithmetric Coding 2. Prediction
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Topology Coding
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Experimental Results
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Progressive Lossless Compression of Arbitrary Simplical Complexes Progressive Lossless Compression of Arbitrary Simplical Complexes. ACM TOG 2002 Pierre-Marie Gondoin Olivier Devillers Related: [Devillers and Gandoin 2000] [Popovic and Hoppe 1997]
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Geometry Driven Approach:kd-tree
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Progressive Simplicial Complexes Jovan Popovic Hugues Hoppe Siggraph 97
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Analysis:
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Prediction
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Results:
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Future Work: Polygonal Meshes
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Future Work: Polygonal Meshes
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Thank You !!
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