#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(,,,);

    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(),sub_img);

    cvNamedWindow("w1");

    cvShowImage("w1",sub_img);

    cvWaitKey();

    cvReleaseImageHeader(&sub_img);

    cvDestroyWindow("w1");

    return ;

}