On achieving low bit rate and quite good image quality with improved CPM and improved NCIM

CPM (Circular Prediction Mapping)is proposed to be combined with NCIM (Noncontractive Interframe Mapping) to achieve big fractal video compression and transmission at low bit rate. But this brings big reduction of image quality. We propose to improve both CPM and NCIM in order to achieve big fractal video compression and transmission at low bit rate at the cost of only a small reduction of image quality. As a preparation for improving both CPM and NCIM, we make necessary changes in quadtree video partition method. In the improved CPM, each range block is approximated by a domain block of the same size. Improved NCIM differs from NCIM, in that only every other frame is a directly utilized key frame with the missing frames utilized indirectly through interpolation of directly utilized key frames. Computer simulation results show that our improvements in both CPM and NCIM do achieve big fractal video compression and transmission at low bit rate in the range of 40-250 kbyte/s at the cost of only a small reduction in image quality.