[1] Z. Zhang and R. S. Blum, Proceedings of IEEE 87, 1315 (1999).

[2] Z. Zhang and R. S. Blum, in Proceedings of 30th Conference on CISS (March 1997).

[3] H. Li, B. S. Manjunath, and S. K. Mitra, Graphical Models and Image Processing 57, 235 (1995).

[4] S. T. Li, Y. N. Wang, and L. Z. Gong, Systems Engineering and Electronics (in Chinese) 24, 45 (2002).

[5] S. T. Li, Y. N. Wang, and C. F. Zhang, Acta Electron. Sin. 29, 1699 (2001).

[6] S. T. Li, T. K. James, and Y. N. Wang, Pattern Recogn. Lett. 23, 985 (2002).

[7] J. W. Huang, Y. Q. Shi, and X. H. Dai, Image Graphics 4, 400 (1999).