Waveletbased multiple description coding of 3D geometry In this work, we present a multiple description coding (MDC) scheme for reliable transmission of compressed three dimensional (3D) meshes. It trades off reconstruction quality for error resilience to provide the best expected reconstruction of 3D 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 3D 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.

Comparison of standardbased H.264 errorresilience techniques and multipledescription coding for robust MIMOenabled video transmission MIMO (multipleinputmultipleoutput) systems offer potential for throughput increase and enhanced quality of service for multimedia transmission. The underlying multipath environment requires new errorresilience techniques if the obtained benefits are to be fully exploited. Different MIMO architectures produce errorpatterns of somewhat diverse characteristics. This paper proposes the use of multipledescription coding (MDC) as an approach that outperforms the standardbased errorresilience techniques in the majority of these cases. Results obtained from the random packeterror generator are furthered through the use of realistic MIMO channel scenarios and argue in favour of the deployment of an MDCbased video transmission system. Singular value decomposition (SVD) is used to create orthogonal subchannels within a MIMO system which provide, depending on their respective gains and fading characteristics, an efficient means of mapping video content. Results indicate improvements in average PSNR of decoded testsequences of up to 3 dB (5dB in the region of high PERs) compared to standard, singledescription video transmission. This is also supported by significant subjective quality enhancements.