Trade off between robustness and R-D performance in zero padding multiple description

Abstract

Multiple description coding (MDC) by sequence under-sampling can be implemented by pre-and post-processing, so it can be associated to most standards for image/video communications. Unfortunately, this method suffers from high side distortion when only one description is received. In order to overcome this limitation, over sampling of sequence via zero padding in the DFT domain has been proposed to improve correlation between subsequent samples, so achieving better estimation of the lost description. The price to be paid is a degradation of the performance in case both descriptions are received. In this paper we present analytical results of zero padded MDC, which can help in the selection of the best trade-off between performance and over sampling factor.