图像边缘检测主要用于增强图像中的轮廓边缘、细节以及灰度跳变部分，形成完整的物体边界，达到将物体从图像中分离出来或将表示同一物体表面的区域检测出来的目的。(In image edge detection is mainly used to enhance image contour edge, details and gray level jump part, forming a complete object boundary, reach to isolate the object from the image or will say the same area is detected on the surface of the object's purpose)