func (img *IplImage) SetROI(rect Rect) {
	C.cvSetImageROI((*C.IplImage)(img), C.CvRect(rect))
}
func (img *IplImage) SetROI(rect Rect) {
	C.cvSetImageROI((*C.IplImage)(img), C.CvRect(rect))
}
/* Sets image ROI (region of interest) (COI is not changed) */