Abstract
A novel search algorithm called superimposed diamond search algorithm SDSA based on lifting wavelet transform LWT for medical image compression is proposed in this paper. Fuzzy C means clustering FCM is applied to extract the region of interest ROI from the medical image. MAXSHIFT method is used to scale the coefficients so that the bits associated with the ROI are placed in higher bit planes than the bits associated with the background without the requirement of the shape information and without the need for calculating the ROI mask. SDSA keeps track of significant pixels of wavelet sub-band in hexagonal search in the scan order of left to right and top to bottom. The experimental results show the good compression ratio over the other existing methods such as set partitioning in hierarchical trees SPIHT and embedded zerotree wavelet EZW.
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