Image compression based on Lossless Region of Interest (ROI) means to compress interesting regions in an image without loss

and to compress uninteresting regions with a little loss. Based on this idea a high compression ratio can be obtained and the important information can be preserved losslessly. In this paper

the near lossless image compression is implemented

based on Integer Wavelet Transform(IWT) and embed zero tree coding scheme. In addition

the tree mapping shape coding scheme is proposed. In this paper the IWT and embed zero tree coding scheme are introduced simply

then the tree mapping shape coding algorithm are presented in detail

finally the experimental results are presented and compared with the results of lossless compression. Experimental results represent that the algorithm can obtain much higher compression ratio than lossless compression algorithms

but the improvement of compression ratio is related to the size of ROI and quality of uninteresting regions.