Wavelet-Based Multiple Description Coding of 3-D Geometry.pdf

Wavelet-Based Multiple Description Coding of 3-D Geometry Andrey Norkina, M. Oguz Bicib, Gozde Bozdagi Akarb, Atanas Gotcheva, and Jaakko Astolaa aInstitute of Signal Processing, Tampere University of Technology, Tampere, Finland; bMiddle East Technical University, Ankara, Turkey. ABSTRACT In this work, we present a multiple description coding (MDC) scheme for reliable transmission of compressed three dimensional (3-D) meshes. It trades off reconstruction quality for error resilience to provide the best expected reconstruction of 3-D mesh at the decoder side. The proposed scheme is based on multiresolution geometry compression achieved by using wavelet transform and modified SPIHT algorithm. The trees of wavelet coefficients are divided into sets. Each description contains the coarsest level mesh and a number of tree sets coded with different rates. The original 3-D geometry can be reconstructed with acceptable quality from any received description. More descriptions provide better reconstruction quality. The proposed algorithm provides flexible number of descriptions and is optimized for varying packet loss rates (PLR) and channel bandwidth. Keywords: Multiple description coding, 3-D geometry, meshes, SPIHT, wavelets, error resilience. 1. INTRODUCTION 3-D models are widely used nowadays. The most common representation for 3-D objects is a surface based triangle mesh.1 Achieving high quality models requires large number of triangles. Therefore, compressing mesh data is necessary due to storage space and bandwidth limitations. A great number of 3-D mesh compression schemes have been proposed in the literature.2 In multimedia applications such as virtual presence, internet computer games, e-commerce, tele-medicine, object-based video compression, 3DTV, 3-D meshes need to be communicated in a networked environment. However, in a typical network, packets may be lost or delayed because of congestions and buffer overflow. There are several error-resilient coding schemes f