(延边大学 计算机科学与技术系 智能信息处理研究室, 吉林 延吉 133002)
hybrid-fast fractal image coding algorithm
wang wei,cui rong-yi-|
(laboratory of intelligent information processing, dept. of computer science & technology, yanbian university, yanji jilin 133002, china)
abstract:this paper proposed a fast fractal image coding algorithm based on two-step selection.firstly,classified all the domain blocks into several categories based on their moment invariant, and then searched the best-matching domain block for every range block to be encoded in the same category or adjacent categories. finally,coded secondarily the range blocks which were larger than threshold based on their information entropy. the proposed algorithm achieves the speed-up of over 5 times compared with the moment-feature-based fractal algorithm for the same psnr. experimental results show that the proposed hybrid method can improve the speed of fractal coding and the quality of decoded image.......