Robust and Scalable Transmission of Arbitrary 3D Models over Wireless Networks
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Research Article Robust and Scalable Transmission of Arbitrary 3D Models over Wireless Networks Irene Cheng,1, 2 Lihang Ying,2 Kostas Daniilidis,1 and Anup Basu2 1 Department 2 Department
of Computer and Information Science, University of Pennsylvania, Philadelphia, PA 19104-6389, USA of Computing Science, University of Alberta, Edmonton, AB, Canada T6G 2E8
Correspondence should be addressed to Irene Cheng, [email protected] Received 26 February 2008; Revised 15 July 2008; Accepted 2 September 2008 Recommended by Peter Eisert We describe transmission of 3D objects represented by texture and mesh over unreliable networks, extending our earlier work for regular mesh structure to arbitrary meshes and considering linear versus cubic interpolation. Our approach to arbitrary meshes considers stripification of the mesh and distributing nearby vertices into different packets, combined with a strategy that does not need texture or mesh packets to be retransmitted. Only the valence (connectivity) packets need to be retransmitted; however, storage of valence information requires only 10% space compared to vertices and even less compared to photorealistic texture. Thus, less than 5% of the packets may need to be retransmitted in the worst case to allow our algorithm to successfully reconstruct an acceptable object under severe packet loss. Even though packet loss during transmission has received limited research attention in the past, this topic is important for improving quality under lossy conditions created by shadowing and interference. Results showing the implementation of the proposed approach using linear, cubic, and Laplacian interpolation are described, and the mesh reconstruction strategy is compared with other methods. Copyright © 2008 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.
1.
INTRODUCTION
The benefit of designing packets optimizing texture-mesh tradeoff was discussed in our earlier work [1]. However, our previous research was restricted to regular meshes, limiting the application of the algorithms. In this work, we extend earlier research by taking transmission of arbitrary meshes into account. To limit the scope of the current work, we only consider mesh transmission in this report. Detailed surveys on simplification algorithms can be found in [2, 3]. These algorithms try to control the complexity of a mesh and preserve surface structures by developing various strategies for generating level-of-detail (LoD) in different parts of a 3D object. An example of geometric simplification is shown in Figure 1, in which the Buddha model is simplified to various resolution levels (number of faces are 3000 left, 1000 middle, and 500 right). There exists substantial literature on multimedia transmission over wireless networks, such as [4, 5]. However, much less research has addressed wireless 3D transmission. The importance of
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