#include <highgui.h>

int main(int argc, char ** argv) {

        IplImage* src;

        if(argc==7 && ((src=cvLoadImage(argv[1], 1))!=0)) {

               int x=atoi(argv[2]);

               int y=atoi(argv[3]);

               int width=atoi(argv[4]);

               int height=atoi(argv[5]);

               int add=atoi(argv[6]);

               cvSetImageROI(src, cvRect(x, y, width, height));

               cvAddS(src, cvScalar(add), src);

               cvResetImageROI(src);

               cvNamedWindow("Roi_Add", 1);

               cvShowImage("Roi_Add", src);

               cvWaitKey();

               cvReleaseImage(&src);

               cvDestroyWindow("Roi_Add");

        }

        return 0;

}

#include <highgui.h>

int main(void) {

        IplImage *interest_img;

        CvRect interest_rect;

        interest_img=cvLoadImage("lueseypid.jpg", 1);

        interest_rect=cvRect(180, 100, 100, 100);

        IplImage* sub_img=cvCreateImageHeader(

               cvSize(

                       interest_rect.width,

                       interest_rect.height

               ),

               interest_img->depth,

               interest_img->nChannels

        );

        sub_img->origin=interest_img->origin;

        sub_img->widthStep=interest_img->widthStep;

        sub_img->imageData=interest_img->imageData +

               interest_rect.y * interest_img->widthStep +

               interest_rect.x * interest_img->nChannels;

        cvAddS(sub_img, cvScalar(150), sub_img);

        cvReleaseImageHeader(&sub_img);

        cvNamedWindow( "WidthStep", CV_WINDOW_AUTOSIZE );

        cvShowImage( "WidthStep", interest_img );

        cvWaitKey();

}