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Advances in Multimedia
Volume 2007 (2007), Article ID 95218, 10 pages
http://dx.doi.org/10.1155/2007/95218
Research Article

Packet-Loss Modeling for Perceptually Optimized 3D Transmission

1Department of Computer and Information Sciences, University of Pennsylvania, Philadelphia 19104, PA , USA
2Department of Computing Science, University of Alberta, Edmonton, Alberta, Canada T6G 2E8

Received 31 October 2006; Accepted 21 December 2006

Academic Editor: Jianfei Cai

Copyright © 2007 Irene Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Transmissions over unreliable networks, for example, wireless, can lead to packet loss. An area that has received limited research attention is how to tailor multimedia information taking into account the way packets are lost. We provide a brief overview of our research on designing a 3D perceptual quality metric integrating two important factors, resolution of texture and resolution of mesh, which control transmission bandwidth, followed by a suggestion on alternative strategies for packet 3D transmission of both texture and mesh. These strategies are then compared with respect to preserving 3D perceptual quality under packet loss in ad hoc wireless networks. Experiments are conducted to study how buffer size, sending rate, sending intervals, and packet size can affect loss in unreliable channels. A model for estimating the optimal packet size is then proposed. We derive the optimal number of packets based on this model, and relate the theoretical derivations to actual network data.