#include <highgui.h>

int main( int argc, char** argv ) 
{
	int i;
    IplImage* img;
		
	img = cvLoadImage( argv[1] );
    cvSetImageROI(img,cvRect(150,150,200,200));

	cvNamedWindow( "ROI", CV_WINDOW_AUTOSIZE );
	cvShowImage( "ROI", img);

	cvResetImageROI(img);
    cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
	cvShowImage( "Example1", img );

    cvWaitKey(0);
    cvReleaseImage( &img );
    cvDestroyWindow( "Example1" );
	cvDestroyWindow( "ROI");
}