这是一个利用ｏｐｅｎｃｖ来方便的选取感兴趣图像区域在原图上标示出并保存的程序，支持ｂｍｐ，ｊｐｇ等常见图像，支持多次选取和保存，附使用说明。 -This is a convenient to use opencv image selected region of interest marked out on the image and save the procedure, support bmp, jpg and other common images, support for multi