Structure unanimity based multiple description subband coding

A new multiple description coding approach is presented in this paper. In this approach, each significant wavelet coefficient is decomposed into two coefficients. One is made from the bits in the odd positions, whereas, the other is made from the bits in the even positions. These two types of coefficients are then grouped into two sub-signals. Two descriptions of coded data are formed from these sub-signals and transmitted over different channels. Similar to the polyphase transform and selective quantization multiple description coding algorithm (PTSQ), main descriptions and protecting data for the other description are separately coded. Since two sub-signals share the same hierarchical tree structure, only coefficient values in the redundancy parts need to be coded, and coding efficiency is improved. Experimental results have shown that the performance of the proposed scheme is better than that of PTSQ.