提取灰度图象中的物体边缘，实现图象的边界轮廓追踪-gray images from the edge of objects, images to achieve the boundary contour tracking

在识别图像中的目标时，往往需要对目标边缘作跟踪处理，也叫轮廓跟踪。顾名思义，轮廓跟踪就是通过顺序找出边缘点来跟踪边界的。,Images in the identification of targets, the target is often necessary for tracking the edge of treatment, also called contour tracking. As the name suggests, contour tracing is to find the