说明：  基于Canny算子的图像边缘检测与提取的算法--- 论文，对模式识别的朋友会有很大帮助，拿来与大家分享，希望能够用的上！
(Canny operator based on image edge detection and extraction algorithms--- papers on pattern recognition would be of considerable help of friends, used to share with you, hoping to use the!)