Tree Structures and Algorithms for Hybrid Transforms

Zerotree based image coding techniques use a standard multiresolution representation of images obtained by a repeated 2-band Discrete Wavelet Transform of images. A lot more modularity and flexibility can be achieved by use of hybrid transforms of images. In this paper we explore the advantages, issues and tree structures for hybrid transforms of images. A few new algorithms for embedded image coding using hybrid transforms have been drafted. The results, interpretations and scenarios where hybrid transforms might find better application than existing methods have been discussed.