中文说明：matlab实现边缘检测，给出canny算法的实现主要步骤及过程，仅供参考。可以和matlab自带的实现算法做比较。适合初学者了解算法实现过程及改进。
English Description：
MATLAB realization of edge detection, to achieve major steps and process of the canny algorithm, for reference only. MATLAB and can compare it to bring their own paper. Suitable for beginners to understand the algorithm implementation and improvement.