Region-based fractal image compression with quadtree segmentation

Fractal image coding is a novel technique for still ima ge c ompression. I n t his paper, a low b it rate r egion-based fractal image compression algorithm i s pr oposed, sev eral techniques ar e i ncluded as follows. First, we improve the performance of quadtree segmentation by adaptive threshold. T hen, a me rging s cheme is e mployed t o t he r esulting quadtree segm entation t hat co mbines several similar blocks into a small number of regions. We also provide a quadtree-based segmented chain code to efficiently record the contours of the regions. The experimental results show that the proposed scheme has the lowest bit rate among the existing schemes at the same level of image quality.