[1] D. C. Marr and E. Hildreth, C. Proc. Roy. Soc. B207, 283 (1980).
[2] J. Canny, IEEE Trans. PAMI 8, 679 (1986).
[3] M. Muneyasu, K. Hotta, and T. Hinamoto, in Transaction of Neural Networks on IEEE International Conference 4, 1703 (1995).
[4] Y. Uchiyama, M. Haseyama, and H. Kitajima, in Transaction of 2001 IEEE International Symposium on Circuits and Systems 3, 608 (2001).
[5] M. Muneyasu, K. Yamamote, and T. Hinamoto, in Transaction of International Conference on Image Processing 2, 33 (1995).
[6] Y. T. Wang, W. Q. Yuan, J. C. Zhou, and S. Wang, J. of Northeastern University (in Chinese) 20, 126 (1999).
[7] H. J. Yang and D. Q. Liang, Acta Electron. Sin. (in Chinese) 29, 51 (2001).