Wavelet Coding of Structured Geometry Data on Triangular Lattice Plane Considering Rate-Distortion Properties(Image Processing and Video Processing)
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概要
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Efficient representations of a 3-D object shape and its texture data have attracted wide attention for the transmission of computer graphics data and for the development of multi-view real image rendering systems on computer networks. Polygonal mesh data, which consist of connectivity information, geometry data, and texture data, are often used for representing 3-D objects in many applications. This paper presents a wavelet coding technique for coding the geometry data structured on a triangular lattice plane obtained by structuring the connectivity of the polygonal mesh data. Since the structured geometry data have an arbitrarily-shaped support on the triangular lattice plane, a shape-adaptive wavelet transform was used to obtain the wavelet coefficients, whose number is identical to the number of original data, while preserving the self-similarity of the wavelet coefficients across subbands. In addition, the wavelet coding technique includes extensions of the zerotree entropy (ZTE) coding for taking into account the rate-distortion properties of the structured geometry data. The parent-children dependencies are defined as the set of wavelet coefficients from different bands that represent the same spatial region in the triangular lattice plane, and the wavelet coefficients in the spatial tree are optimally pruned based on the rate-distortion properties of the geometry data. Experiments in which proposed wavelet coding was applied to some sets of polygonal mesh data showed that the proposed wavelet coding achieved better coding efficiency than the Topologically Assisted Geometry Compression scheme adopted in the MPEG-4 standard.
- 社団法人電子情報通信学会の論文
- 2004-05-01
著者
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Kaneko H
Faculty Of Science And Technology Sophia University:(present Address)nhk Sendai
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KANEKO Hiroyuki
Faculty of Engineering, Akita University
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Kaneko H
Keio Univ. Yokohama
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FUKUDA Koichi
Faculty of Science and Technology, Sophia University
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KAWANAKA Akira
Faculty of Science and Technology, Sophia University
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Kawanaka Akira
Faculty Of Science And Technology Sophia University
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Fukuda Koichi
Faculty Of Science And Technology Sophia University
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