OpenCV --- 实现两幅图像并排合并（ROI）

　　 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);