[1] [1] Y.-F. Yao, X.-Y. Jing, and H.-S. Wong, Neurocomputing 70, 1582 (2007).

[2] [2] L. Jiang, Y. Luo, J. Zhao, and T. Zhuang, Chin. Opt. Lett. 6, 495 (2008).

[3] [3] J. Li and J.-S. Pan, Chin. Opt. Lett. 6, 255 (2008).

[4] [4] P. N. Belhumeur, J. P. Hespanha, and D. J. Kriegman, IEEE Trans. Pattern Anal. Mach. Intell. 19, 711 (1997).

[5] [5] X. He, S. Yan, Y. Hu, P. Niyogi, and H.-J. Zhang, IEEE Trans. Pattern Anal. Mach. Intell. 27, 328 (2005).

[6] [6] T. Ahonen, A. Hadid, and M. Pietikainen, IEEE Trans. Pattern Anal. Mach. Intell. 28, 2037 (2006).

[7] [7] T. Ojala, M. Pietikainen, and T. Maenpaa, IEEE Trans. Pattern Anal. Mach. Intell. 24, 971 (2002).

[8] [8] P. J. Phillips, H. Wechsler, J. Huang, and P. J. Rauss, Image Vis. Comput. 16, 295 (1998).

[9] [9] P. J. Phillips, H. Moon, S. A. Rizvi, and P. J. Rauss, IEEE Trans. Pattern Anal. Mach. Intell. 22, 1090 (2000).

[10] [10] W. Gao, B. Cao, S. Shan, X. Chen, D. Zhou, X. Zhang, and D. Zhao, IEEE Trans. Syst. Man Cybern. A 38, 149 (2008).

[11] [11] Z. Zheng, F. Yang, W. Tan, J. Jia, and J. Yang, Signal Processing 87, 2473 (2007).