中文说明：程序里面有两部分，对cameraman仿真程序。两个小程序分别能运行，对于学习很有帮助。轮廓提取主要是从一个种子点，用搜索的方法找到闭合的轮廓。边缘检测主要是根据图像上的边缘在像素上变化很大的，用微分的方法，找到边缘。
English Description：
Program has two parts, the cameraman emulator. Two little programs that can run, helpful for learning. Contour extraction is largely from a seed point using search methods to find the closed contour. Edge detection is based mainly on the edge of the image in pixels has changed a lot, using differential method to find edges.