Opencv4新属性-二维码识别

int main()
{
    Mat img = imread("C:\Users\24731\Desktop\000\001.jpg");
    if (img.empty())
    {
        cout << "请确认图像文件名称是否正确" << endl;
        return -1;
    }
    Mat gray, qrcode_bin;
    cvtColor(img, gray, COLOR_BGR2GRAY);
    QRCodeDetector qrcodedetector;
    vector<Point> points;
    string information;
    bool isQRcode;
    isQRcode = qrcodedetector.detect(gray, points);  //识别二维码
    if (isQRcode)
    {
        //解码二维码
        information = qrcodedetector.decode(gray, points, qrcode_bin);
        cout << points << endl;  //输出二维码四个顶点的坐标
    }
    else
    {
        cout << "无法识别二维码，请确认图像时候含有二维码" << endl;
        return -1;
    }
    //绘制二维码的边框
    for (int i = 0; i < points.size(); i++)
    {
        if (i == points.size() - 1)
        {
            line(img, points[i], points[0], Scalar(0, 0, 255), 2, 8);
            break;
        }
        line(img, points[i], points[i + 1], Scalar(0, 0, 255), 2, 8);
    }
    //将解码内容输出到图片上
    putText(img, information.c_str(), Point(20, 30), 0, 1.0, Scalar(0, 0, 255), 2, 8);

    //利用函数直接定位二维码并解码
    string information2;
    vector<Point> points2;
    information2 = qrcodedetector.detectAndDecode(gray, points2);
    cout << points2 << endl;
    putText(img, information2.c_str(), Point(20, 55), 0, 1.0, Scalar(0, 0, 0), 2, 8);

    //输出结果
    imshow("result", img);
    namedWindow("qrcode_bin", WINDOW_NORMAL);
    imshow("qrcode_bin", qrcode_bin);
    waitKey(0);
    return 0;
}