图片的预处理 将图片读入之后 经过灰度处理 中值滤波（多次） sobel算子运算

二值化运算 最后做细化 处理 显示并保存 细化后的图象-Pretreatment of the picture after the picture to read through the gray scale median filter processing (multiple) sobel operator Binary operator to do the final thinning operation display and save the image after thinning