opencv,C++图像处理相关，包括鼠标区域选取，截图，及简单的图像加载，适用计算机视觉初学者。-opencv, C++ image processing-related, including mouse selection area, screenshots, and simple image loading, computer vision for beginners.

用于在图像中手动选取感兴趣区域的程序,用鼠标点击图像四下得到一个原图片的四边形区域截图。-For in the image of the program manually selected region of interest