func (img *IplImage) GetROI() Rect {
	r := C.cvGetImageROI((*C.IplImage)(img))
	return Rect(r)
}
func (img *IplImage) GetROI() Rect {
	r := C.cvGetImageROI((*C.IplImage)(img))
	return Rect(r)
}
/* Retrieves image ROI */