Evaluation of zero tree wavelet coders

Image compression techniques play a vital role in satellite and multimedia applications. Wavelet transforms have received significant attention recently due to their suitability for a number of signal and image compression applications and they have established their viability for the same. This is mainly due to the lapped nature of this transform and the computational simplicity, which comes in the form of filter bank implementations. In this paper, the performance of zero tree wavelet coders such as the Embedded Zero Tree Wavelet (EZW) coder, Set Partitioning In Hierarchical Trees (SPIHT) coder and Packetizable Zero tree Wavelet (PZW) coder for different levels of decomposition, compression ratios and for different percentage of packet losses are evaluated. PSNR is used as the criteria for the measurement of reconstructed image quality.