各种图像边缘提取算法的C语言实现及一些测试用图像。这些算法包括：Marr、Canny、shen-Castan、Sobel等等。（注：这些代码是《Algorithms for Image Processing And Computer Vision》一书中的内容，要想理解代码最好参看原书）。-various Image Edge Extraction Algorithm in C language and some test images. These algorithms include : M

沈算子，中国人发明的，很好的滤波算子 算法简单，很容易实现-Operator Shen, the Chinese invented a very good filtering algorithm is simple, very easy to achieve