opencv把一张图片覆盖到另一张图片上

#include 
//#include 
#include 
#include 
#include 
#include //模块，物体检测
//#include 

using namespace std;
using namespace cv;


int main()
{
	Mat M(128,64,CV_8UC3,Scalar(255,255,255));
	Mat src=imread("d:/car/1.jpg");
	Mat roi=M(Rect(0,32,src.cols,src.rows));
	src.copyTo(roi);
	imshow("1",M);
	waitKey();
}