Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2011, Vol. 34 ›› Issue (1): 69-74.doi: 10.13190/jbupt.201101.69.wuyq

• Papers • Previous Articles     Next Articles

Fast Fractal Image Coding Based on Immunity Particle Swarm Optimization and Fuzzy Kernel Clustering

  

  • Received:2010-04-14 Revised:2010-09-12 Online:2011-02-28 Published:2011-02-28
  • Contact: Wu Yi-Quan E-mail:nuaaimage@yahoo.com.cn
  • Supported by:

    National Natural Science Foundation of China

Abstract:

Aiming at the lengthy of classical fractal coding algorithm and the problem of fast fractal image coding algorithm based on such as Kmeans clustering, a fast fractal image coding algorithm based on immunity particle swarm optimization(IPSO)and fuzzy kernel clustering is proposed. Firstly, an algorithm of fuzzy kernel clustering based on IPSO is presented. The IPSO algorithm is used to calculate the cluster centers. Then the proposed algorithm of fuzzy kernel clustering based on IPSO is applied to fractal image coding. The range blocks and domain blocks are clustered reasonably by fuzzy kernel method, respectively. Range blocks are searched in the corresponding category of domain blocks. As a result, the encoding time is reduced significantly. The experimental results show that, the encoding time of the proposed algorithm is about six times less than that of the classical algorithm at the cost of slight decrease of peak signaltonoise ratio. Compared with the fast fractal image coding algorithm reported recently based on such as Kmeans clustering and particleswarmoptimization clustering, the proposed algorithm can achieve higher peak signaltonoise ratio in much less encoding time.

Key words: image coding, fast fractal coding, fuzzy kernel clustering, immunity particle swarm optimization