方法一,使用图像ROI:

方法二,使用cvGetSubRect方法:

直接附上源码:

IplImage* GetSubImage(IplImage* src, TEZIVRoi *ptROI)
{
    CvRect rect;
    IplImage* dst = NULL;
    //IplImage* dst = ptFullImg(cv::Range(0,100), cv::Range(50,200));

    rect.x        = ptROI->m_nPosX;
    rect.y        = ptROI->m_nPosY;
    rect.width    = ptROI->m_nWidth;
    rect.height = ptROI->m_nHeight;

#if 1
    cvSetImageROI(src,rect);
    cvResize(src, dst, CV_INTER_LINEAR);
#else
    CvMat *tempMat=cvCreateMat(dst->width,dst->height,CV_MAKETYPE(dst->depth,dst->nChannels));
    cvGetSubRect(src,tempMat,rect);
    cvResize(tempImg, dst, CV_INTER_LINEAR);
#endif

    return dst;
}