[综] Canny Edge Detection 代码

http://www.mathworks.com/matlabcentral/fileexchange/29510-canny-edge-detection

http://blog.sina.com.cn/s/blog_3eec0ced0100hnsi.html

http://robotics.eecs.berkeley.edu/~sastry/ee20/index.html

http://www.mathworks.com/matlabcentral/fileexchange/20899-canny-edge-detection