[1] [1] B. Guo, Q. Zhang, and Y. Hou, Chin. Opt. Lett. 6, 338 (2008).

[2] [2] C. Liu, Z. Jing, G. Xiao, and B. Yang, Chin. Opt. Lett. 5, 274 (2007).

[3] [3] A. Toet and J. Walraven, Opt. Eng. 35, 650 (1996).

[4] [4] A. M. Waxman, A. N. Gove, D. A. Fay, J. P. Racamato, J. E. Carrick, M. C. Seibert, and E. D. Savoye, Neural Netw. 10, 1 (1997).

[5] [5] D. A. Fay, A. M. Waxman, M. Aguilar, D. B. Ireland, J. P. Racamato, W. D. Ross, W. W. Streilein, and M. I. Braun, Proc. SPIE 4023, 106 (2000).

[6] [6] G. Ni, M. Xiao, Q. Qin, and G. Huang, Acta Opt. Sin. (in Chinese) 27, 2101 (2007).

[7] [7] A. Toet, Information Fusion 4, 155 (2003).

[8] [8] A. Toet, Displays 26, 15 (2005).

[9] [9] S. Sun, Z. Jing, G. Liu, and Z. Li, Chin. Opt. Lett. 3, 448 (2005).

[10] [10] V. Tsagiris and V. Anastassopoulos, Displays 26, 191 (2005).

[11] [11] S. Shi, L. Wang, W. Jin, and Y. Zhao, Proc. SPIE 6623, 66230B (2008).

[12] [12] M. A. Hogervorst and A. Toet, in Proceedings of 10th International Conference on Information Fusion 1 (2007).

[13] [13] Y. Zheng and E. A. Essock, Information Fusion 9, 186 (2008).

[14] [14] A. E. Welchman, A. Deubelius, V. Conrad, H. H. Bülthoff, and Z. Kourtzi, Nature Neurosci. 8, 820 (2005).

[15] [15] A. Saxena, S. H. Chung, and A. Y. Ng, Int. J. Comput. Vis. 76, 53 (2008).

[16] [16] R. P. O’Shea, S. G. Blackburn, and H. Ono, Vision Res. 34, 1595 (1994).

[17] [17] D. Comaniciu and P. Meer, IEEE Trans. Pattern Anal. Machine Intell. 24, 603 (2002).