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#include "opencv2/objdetect.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/highgui.hpp"
#include <string>
#include <iostream>
using namespace std;
using namespace cv;
void getMatWithQRCodeContour(Mat &color_image, vector<Point> transform);
void getMatWithFPS(Mat &color_image, double fps);
int liveQRCodeDetect();
int showImageQRCodeDetect(string in, string out);
int main(int argc, char *argv[])
{
const string keys =
"{h help ? | | print help messages }"
"{i in | | input path to file for detect (with parameter - show image, otherwise - camera)}"
"{o out | | output path to file (save image, work with -i parameter) }";
CommandLineParser cmd_parser(argc, argv, keys);
cmd_parser.about("This program detects the QR-codes from camera or images using the OpenCV library.");
if (cmd_parser.has("help"))
{
cmd_parser.printMessage();
return 0;
}
string in_file_name = cmd_parser.get<string>("in"); // input path to image
string out_file_name = cmd_parser.get<string>("out"); // output path to image
if (!cmd_parser.check())
{
cmd_parser.printErrors();
return -1;
}
int return_code = 0;
if (in_file_name.empty())
{
return_code = liveQRCodeDetect();
}
else
{
return_code = showImageQRCodeDetect(in_file_name, out_file_name);
}
return return_code;
}
void getMatWithQRCodeContour(Mat &color_image, vector<Point> transform)
{
if (!transform.empty())
{
double show_radius = (color_image.rows > color_image.cols)
? (2.813 * color_image.rows) / color_image.cols
: (2.813 * color_image.cols) / color_image.rows;
double contour_radius = show_radius * 0.4;
vector< vector<Point> > contours;
contours.push_back(transform);
drawContours(color_image, contours, 0, Scalar(211, 0, 148), cvRound(contour_radius));
RNG rng(1000);
for (size_t i = 0; i < 4; i++)
{
Scalar color = Scalar(rng.uniform(0,255), rng.uniform(0, 255), rng.uniform(0, 255));
circle(color_image, transform[i], cvRound(show_radius), color, -1);
}
}
}
void getMatWithFPS(Mat &color_image, double fps)
{
ostringstream convert;
convert << cvRound(fps) << " FPS.";
putText(color_image, convert.str(), Point(25, 25), FONT_HERSHEY_DUPLEX, 1, Scalar(0, 0, 255), 2);
}
int liveQRCodeDetect()
{
VideoCapture cap(0);
if(!cap.isOpened())
{
cout << "Cannot open a camera" << '\n';
return -4;
}
QRCodeDetector qrcode;
TickMeter total;
for(;;)
{
Mat frame, src, straight_barcode;
string decode_info;
vector<Point> transform;
cap >> frame;
if(frame.empty()) { break; }
cvtColor(frame, src, COLOR_BGR2GRAY);
total.start();
bool result_detection = qrcode.detect(src, transform);
if (result_detection)
{
decode_info = qrcode.decode(src, transform, straight_barcode);
if (!decode_info.empty()) { cout << decode_info << '\n'; }
}
total.stop();
double fps = 1 / total.getTimeSec();
total.reset();
if (result_detection) { getMatWithQRCodeContour(frame, transform); }
getMatWithFPS(frame, fps);
imshow("Live QR code detector", frame);
if( waitKey(30) > 0 ) { break; }
}
return 0;
}
int showImageQRCodeDetect(string in, string out)
{
Mat src = imread(in, IMREAD_GRAYSCALE), straight_barcode;
string decoded_info;
vector<Point> transform;
const int count_experiments = 10;
double transform_time = 0.0;
bool result_detection = false;
TickMeter total;
QRCodeDetector qrcode;
for (size_t i = 0; i < count_experiments; i++)
{
total.start();
transform.clear();
result_detection = qrcode.detect(src, transform);
total.stop();
transform_time += total.getTimeSec();
total.reset();
if (!result_detection) { break; }
total.start();
decoded_info = qrcode.decode(src, transform, straight_barcode);
total.stop();
transform_time += total.getTimeSec();
total.reset();
if (decoded_info.empty()) { break; }
}
double fps = count_experiments / transform_time;
if (!result_detection) { cout << "QR code not found\n"; return -2; }
if (decoded_info.empty()) { cout << "QR code cannot be decoded\n"; return -3; }
Mat color_src = imread(in);
getMatWithQRCodeContour(color_src, transform);
getMatWithFPS(color_src, fps);
for(;;)
{
imshow("Detect QR code on image", color_src);
if( waitKey(30) > 0 ) { break; }
}
if (!out.empty())
{
getMatWithQRCodeContour(color_src, transform);
getMatWithFPS(color_src, fps);
cout << "Input image file path: " << in << '\n';
cout << "Output image file path: " << out << '\n';
cout << "Size: " << color_src.size() << '\n';
cout << "FPS: " << fps << '\n';
cout << "Decoded info: " << decoded_info << '\n';
vector<int> compression_params;
compression_params.push_back(IMWRITE_PNG_COMPRESSION);
compression_params.push_back(9);
try
{
imwrite(out, color_src, compression_params);
}
catch (const cv::Exception& ex)
{
cout << "Exception converting image to PNG format: ";
cout << ex.what() << '\n';
return -3;
}
}
return 0;
}