Shape{adaptive Wavelet Transform for Zerotree Coding

In this paper the problem of object coding is addressed. In order to satisfy the needs of new applications in a multi-resolution environment the problem of object{oriented coding has to be addressed. In this paper a new approach of object coding is proposed. It is based on an arbitrarily{shaped subband transform followed by a generalized embedded zerotree wavelet algorithm. It is shown in the paper that it achieves good compression results and has additional properties such as supporting arbitrarily{shaped regions, being computationally eecient, keeping the same dimensionality in the transformed domain, being perfect reconstruction , and allowing a perfect rate control. In addition a lossless mode can be deened by using an appropriate lter bank.