Host: The Institute of Image Electronics Engineers of Japan
In fractal image coding, we first divide the entire image into non-overlapping range blocks. Then, we approximate each range block using the contraction map of a domain block that is extracted from the same image with a larger size than range block. Since the method utilizes selfsimilarity contained in the image to be coded, the fractal parameters (IFS codes) extracted can be directly used for image enlargement. However, the quality of enlarged images using IFS codes is not always sufficient due to unpleasant noise caused by block approximation. To solve this problem, in this work, we propose three methods to improve the quality of enlarged images using IFS codes, i.e., (i) the method using multiple domain blocks (MDB), (ii) the method using multiple range blocks (MRB), and (iii) the method combined (i) and (ii) (MRB+MDB). We verify the performance of the proposed methods through computer simulation.
