[1] [1] DUAN Rui-ling，LI Qing-xiang，LI Yu-he. Summary of image edge detection [J]. Optical Technique，2005，31(3)：415-419.

[2] [2] GONZALEZ R C，WOODS R E. Digital Image Processing, Second Edition [M]. Prencice Hall，2002.

[3] [3] CANNY J. A Computational Approach to Edge Detection [J]. IEEE Trans. on Pattern Analysis and Machine Intelligence (S0162-8828)，1986，8(6)：679-698.

[4] [4] HEATH M，SARKAR S，SANOCKI T，et al. Comparison of edge detectors：a methodology and initial study [J]. Computer Vision and Image Understanding(S1077-3142)，1998，69(1)：38-54.

[5] [5] Kang Chung-Chia，Wang Wen-June. A novel edge detection method based on the maximizing objective function [J]. Pattern Recognition(S0031-3203)，2007，40(2)：609-618.

[6] [6] YU Yong，GUO Lei. Ant Colony Search for Edge Extraction in Noise Image [J]. Journal of Electronics & Information Technology，2008，30(6)：1271-1275.

[7] [7] YEN T J. A Qualitative Profile-based Approach to Edge Detection [M]. New York, USA：New York University，2003.

[8] [8] ZHANG Lin-xi，WANG Bao-ping，ZHANG Yan-ning，et al. Amethod of image edge detection based on multiple edge features and FCM [J]. Acta Photonica Sinica，2005，34(12)：1893-1896