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Photometry Data Compression for Three-dimensional Mesh Models Using Connectivity and Geometry Information  

Yoon, Young-Suk (Electronics and Telecommunications Research Institute, S/W & Content Research Laboratory, Digital Content Research Division)
Ho, Yo-Sung (Gwangju Institute of Science and Technology, Department of Information and Communications)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.45, no.3, 2008 , pp. 160-174 More about this Journal
Abstract
In this paper, we propose new coding techniques for photometry data of three-dimensional(3-D) mesh models. We make a good use of geometry and connectivity information to improve coding efficiency of color, normal vector, and texture data. First of all, we determine the coding order of photometry data exploiting connectivity information. Then, we exploit the obtained geometry information of neighboring vortices through the previous process to predict the photometry data. For color coding, the predicted color of the current vertex is computed by a weighted sum of colors for adjacent vortices considering geometrical characteristics between the current vortex and the adjacent vortices at the geometry predictor. For normal vector coding, the normal vector of the current vertex is equal to one of the optimal plane produced by the optimal plane generator with distance equalizer owing to the property of an isosceles triangle. For texture coding, our proposed method removes discontinuity in the texture coordinates and reallocates texture image segments according to the coding order. Simulation results show that the proposed compression schemes provide improved performance over previous works for various 3-D mesh models.
Keywords
Photometry Data; 3-D Mesh Models; Colors; Normal Vectors; Texture Coordinates;
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