在图形的多有点中，连线实现画出所有点的外界凸边形，开发工具Opencv+VC-In the multi-bit graphics, the connection to achieve all the points drawn outside convex polygon, development tools Opencv+ VC++

在VC下用OpenCV在调取出来的图片上画线-In the VC use in obtaining OpenCV out the image of the painting line