所谓边缘就是指图像局部亮度变化最显著的部分，它是检测图像局部变化显著变化的最基本的运算。对于数字图像，图像灰度灰度值的显著变化可以用梯度来表示，以边缘检测Sobel算子为例来讲述数字图像处理中边缘检测的实现-Edge refers to the so-called partial image brightness changes in the most notable part of it is to test local image change significantly change the basic arithmetic. For digital images, image intensity values of gray significant gradient changes can be expressed as to Sobel edge detection operators as an example to tell the story of digital image processing to achieve the Edge Detection