Robust image transmission based on wavelet tree coding and EREC
Lei Cao, Chang Wen Chen · 2002
We propose a robust image transmission scheme based on wavelet tree coding and error resilient entropy coding (EREC). After the wavelet decomposition, the coefficients are re-arranged into wavelet trees according to their spatial representation. Each wavelet tree is coded independently so that the scheme is essentially a block-based coding in the spatial domain. Since the self-similarity across subbands is preserved, a high source coding efficiency can be achieved. EREC is then adopted to enhance the error resilience capability of the compressed bitstream. At the receiving end, the automatic re-synchronization of each block is obtained. Furthermore, the bits impacted by the error propagation are more likely located in the low bit-layers so that the resultant degradation is less severe in terms of PSNR. Experimental results show that this proposed scheme can achieve a good error resilient performance.