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In this paper a new fractal image compression algorithm is proposed in whichthe time of encoding process is considerably reduced. The algorithm exploits adomain pool reduction approach, along with using innovative predefined valuesfor contrast scaling factor, S, instead of scanning the parameter space [0,1].Within this approach only domain blocks with entropies greater than a thresholdare considered. As a novel point, it is assumed that in each step of theencoding process, the domain block with small enough distance shall be foundonly for the range blocks with low activity (equivalently low entropy). Thisnovel point is used to find reasonable estimations of S, and use them in theencoding process as predefined values, mentioned above. The algorithm has beenexamined for some well-known images. This result shows that our proposedalgorithm considerably reduces the encoding time producing images that areapproximately the same in quality.

A Fast Fractal Image Compression Algorithm Using Predefined Values for Contrast Scaling