用qt制作界面，用opencv库打开图片(Make the interface with QT, use opencv library to open pictures)

在ubuntu12.04，基于qt4.8编写的使用opencv打开摄像头，并进行拍照，保存照片，读图片进行裁剪(In ubuntu12.04, written on qt4.8, use OpenCV to open the camera, and take pictures, save photos, read pictures, cut them out)