[1] S. Zhu and J. Liu, Chin. Opt. Lett. 7, 580 (2009).

[2] J. Zheng, D. Feng, Y. Zhang, and R. Zhao, Chin. J. Computers (in Chinese) 27, 371 (2004).

[3] P. L. Lin, C.-K. Hsieh, and P.-W. Huang, Pattern Recognition 38, 2519 (2005).

[4] C.-C. Chang, Y.-H. Fan, and W.-L. Tai, Pattern Recognition 41, 654 (2008).

[5] M.-S. Wang and W.-C. Chen, Computer Standards & Interfaces 29, 561 (2007).

[6] X. Zhang and S. Wang, IEEE Trans. Multimedia 10, 1490 (2008).

[7] H.-J. He, J.-S. Zhang, and H.-M. Tai, Lecture Notes in Computer Science 5806, 132 (2009).

[8] M. Li, J. Tian, and F. Chen, Pattern Recognition Lett. 29, 392 (2008).

[9] Z. Jiang and Y.-X. Huang, Information Sci. 179, 2002 (2009).

[10] R.-Z. Wang and Y.-D. Tsai, Pattern Recognition 40, 398 (2007).

[11] J. F. Delaigle, C. Devleeschouwer, B. Macq, and I. Langendijk, in Proceedings of 2002 IEEE International Conference on Multimedia & Expo 489 (2002).

[12] J. Wu, J. Xie, and Y. Yang, J. Harbin Institute Technol. 14, 281 (2007).

[13] W.-C. Chen and M.-S. Wang, Expert Systems with Applications 36, 1300 (2009).

[14] A. Kanso and N. Smaoui, Chaos Solitons and Fractals 40, 2557 (2009).

[15] H. Proen ca and L. A. Alexandre, Lecture Notes in Computer Science 3617, 970 (2005).