用Opencv从相机中获取部分图像

Question

我想从相机获得部分图像。我有这个密码。这段代码在摄像机上显示的是矩形。我需要得到rectangle include image

 for(int i=0;i<(detectRect_face ? detectRect_face->total:0); i++ )
    {
        CvRect* r = (CvRect*)cvGetSeqElem(detectRect_face, i); 
        CvPoint pt1 = { r->x+20, r->y+20 }; 
        CvPoint pt2 = { r->x + r->width-20, r->y + r->height-10 }; 
        cvRectangle(frame, pt1, pt2, CV_RGB(255,0,0), 1,8, 0); 
         //I need to write here a method to get this rectangle include image.
    }

Answer 1

您可以使用cvSetImageROI和cvCopy方法来裁剪图像。

IplImage *dst = // Prepare partition size image.
cvSetImageROI(frame, r);
cvCopy(frame, dst);
cvResetImageROI(frame);