[1] F. Vella, A. Castorina, M. Mancuso, and G. Messina, IEEE Trans. Consum. Electron. 48, 796 (2002).
[2] S.-J. Ko, S.-H. Lee, and K. H. Lee, IEEE Trans. Consum. Electron. 44, 617 (1998).
[3] J. Zhu and B. Guo, Acta Opt. Sin. (in Chinese) 26, 516 (2006).
[4] S. Erturk and T. J. Dennis, IEEE Proc. on Image Vision and Signal Processing 147, 95 (2000).