A signal-to-noise ratio (SNR) and temporal scalable coding algorithm for 3-dmesh sequences using singular value decomposition (SVd) is proposed in this work. The proposed algorithm employs SVd to represent a mesh seq...
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A signal-to-noise ratio (SNR) and temporal scalable coding algorithm for 3-dmesh sequences using singular value decomposition (SVd) is proposed in this work. The proposed algorithm employs SVd to represent a mesh sequence with a small number of basis vectors, and encodes those basis vectors with a bit plane coder. We analytically derive the contribution of each bit plane to the reconstructedmesh quality, and transmit the bit planes in the decreasing order of their amounts of contribution. As the decoder receives more bit planes, it reconstructs higher quality mesh sequences progressively. Moreover, we develop a temporal prediction mode to improve the rate-distortion (R-d) performance further, which also supports temporal scalability. Simulation results demonstrate that the proposed algorithm yields significantly better R-d performance than conventional SVd-based coders. (C) 2009 Elsevier Inc. All rights reserved.
For wireless network based graphics applications, a key challenge is how to efficiently transmit complex 3-d models over bandwidth-limited wireless channels. Most existing 3-dmesh transmission systems do not consider...
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For wireless network based graphics applications, a key challenge is how to efficiently transmit complex 3-d models over bandwidth-limited wireless channels. Most existing 3-dmesh transmission systems do not consider such a view-dependent delivery issue, and thus transmit unnecessary portions of 3-dmesh models, which leads to the waste in precious wireless network bandwidth. In this paper, we propose a novel view-dependent 3-d model transmission scheme, where a 3-d model is partitioned into a number of segments, each segment is then independently coded using the MPEG-4 3dMC coding algorithm, and finally only the visible segments are selected anddelivered to the client. Moreover, we also propose analytical models to find the optimal number of segments so as to minimize the average transmission size. Simulation results show that such a view-based3-d model transmission is able to substantially save the transmission bandwidth and therefore has a significant impact on wireless graphics applications.
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