Multiple description wavelet based image coding

We consider the problem of coding images for transmission over error-prone channels. The impairments we target are transient channel shutdowns, as wou ld occur in a packet network when a packet is lost, or in a wireless system during a deep fade: when data is delivered it is assumed to be error-free, but some of the data may never reach the receiver. The proposed algorithms are based on a combination of multiple description scalar quantizers with techniques successfully applied to the construction of some of the most eff icient subband coders. A given image is encoded into multiple independent p ackets of roughly equal length. When packets are lost, the quality of the a pproximation computed at the receiver depends only on the number of packets received, but does not depend on exactly which packets are actually receiv ed. When compared with previously reported results on the performance of ro bust image coders based on multiple descriptions, on standard test images, our coders attain similar PSNR values using typically about 50-60% of the b it rate required by these other state-of-the-art coders, while at the same time providing significantly more freedom in the mechanism for allocation o f redundancy among descriptions.