A Fast Fractal Image Encoding Approach Combined with Discrete Cosine Transform
Jin-Shu Han · Computer Engineering and Science · 2007
Based on energy preservation and the compactness characteristics and the filtering characteristics of DCT(discrete cosine transform), an improved fast fractal image encoding approach is presented. Firstly, to exclude the unmatching image blocks, the vertical space frequency and the horizontal space frequency are extracted as the feature parameters of image blocks. Then, in the DCT domain, range blocks and domain blocks with similar features do similar matching by considering both low frequency and intermediate-high frequency parameters. Experimental results show the validity of the presented approach in improving the speed of fractal encoding and holding the decoding quality.