#include <opencv2/opencv.hpp>
#include <iostream>
using namespace cv;
using namespace std;


int main(int argc, char *argv[])
{
	Mat img1 = imread("1.png");
	Mat img2 = imread("2.png");
	int height = img1.rows;
	int width1 = img1.cols;
	int width2 = img2.cols;
	// 将高图像等比缩放与低图像高度一致
	if (img1.rows > img2.rows)
	{
		height = img2.rows;
		width1 = img1.cols * ((float)img2.rows / (float)img1.rows);
		resize(img1, img1, Size(width1, height));
	}
	else if(img1.rows < img2.rows)
	{
		width2 = img2.cols * ((float)img1.rows / (float)img2.rows);
		resize(img2, img2, Size(width2, height));
	}
	//创建目标Mat
	Mat des;
	des.create(height, width1 + width2, img1.type());
	Mat r1 = des(Rect(0, 0, width1, height));
	img1.copyTo(r1);
	Mat r2 = des(Rect(width1, 0, width2, height));
	img2.copyTo(r2);

	namedWindow("des");
	imshow("des", des);
	waitKey(0);

	return 0;
}

运行结果：