Robust Transmission of SPIHT-Coded Images Over Packet Networks

A novel hybrid error-resilience and error-concealment technique for embedded wavelet coders is presented. Aimed to resolve data loss in real-time visual transmission over the packet erasure channels, the proposed method incorporates data partitioning and multiple description coding into the set partitioning in hierarchical tree (SPIHT´s) encoding process. Each of the spatial-orientation trees of SPIHT is independently coded and packetized with multiple descriptions of important wavelet coefficients. At decoding, the coefficients that cannot be recovered are predicted through linear interpolation. The estimation is based on either intraband or inter-band correlation among wavelet coefficients. Experimental results show that the proposed method achieves good and stable error performance with low additional redundancy