Color Image Compression on Spiral Architecture using Optimized Domain Blocks in Fractal Coding

Fractal coding is a lossy compression method and used for grey level images through rectangular range and domain blocks. The proposed approach, firstly, compose the one-plane image using the pixel´s trichromatic coefficients. One-plane image in traditional square structure is represented in spiral architecture for compression, where the range and domain blocks are formed with the cluster of 7 and 49 pixels respectively. On this spiral architecture image, modified fractal grey level image coding algorithm is applied to get encoded image. In this modified fractal coding, the numbers of domain blocks are optimized. Extensive experiments are carried out on indoor and outdoor images. The proposed approach minimizes the encoding process time because of optimized domain blocks and one dimensional structure of spiral architecture with time complexity in the order of n and falls in the lossy compression category