OpenCV —— ROI

#include <cv.h>
#include <highgui.h>

int main(int argc,char** argv)
{
    IplImage* src;

    src=cvLoadImage("wukong.jpg",CV_LOAD_IMAGE_COLOR);

//     cvSetImageROI(src,cvRect(50,50,100,100));
//     cvAddS(src,cvScalar(90),src);
//     cvResetImageROI(src);


    CvRect rect=cvRect(50,50,100,100);
    IplImage* sub_img=cvCreateImageHeader(cvSize(rect.width,rect.height),src->depth,src->nChannels);
    sub_img->origin=src->origin;
    sub_img->widthStep=src->widthStep;
    sub_img->imageData=src->imageData+rect.y*src->widthStep+rect.x*src->nChannels;
    cvAddS(sub_img,cvScalar(90),sub_img);

    cvNamedWindow("w1");
    cvShowImage("w1",sub_img);
    cvWaitKey();

    cvReleaseImageHeader(&sub_img);
    cvDestroyWindow("w1");
    return 0;
}