#include <iostream>
#include "opencv2/opencv.hpp"

using namespace std;
using namespace cv;

int main() {
	VideoCapture cap(0);

	if (!cap.isOpened()) {
		cerr << "Camera open failed!" << endl;
		return 0;
	}

	QRCodeDetector detector;

	Mat frame;
	while (true) {
		cap >> frame;
		if (frame.empty())
			break;

		vector<Point> points;
		Mat straightQRCode;
		string info = detector.detectAndDecode(frame, points, straightQRCode);
		resize(straightQRCode, straightQRCode, Size(200, 200));

		if (!info.empty()) {
			polylines(frame, points, true, Scalar(0, 0, 255), 2);
			putText(frame, info, Point(10, 30), FONT_HERSHEY_DUPLEX, 1, Scalar(0, 0, 255));
			imshow("QR", straightQRCode);
		}
		else {
			destroyWindow("QR");
		}

		imshow("frame", frame);

		if (waitKey(10) == 27)
			break;
	}

	return 0;
}