Image Compression Methods Based on Wavelet Transforms

The Set Partitioning into Hierarchical Trees algorithm for wavelet-based image coding allow fully scalable transmission. In this paper, two methods were proposed to improve the coding efficiency of the SPIHT algorithm. In the first, the predictable coding redundancies in the algorithm are removed; on the other hand, the second method takes advantage of the characteristic that different subbands have different magnitude distributions. Finally, experiment results are also given to demonstrate the effectiveness of the proposed methods.