tutorial-barcode-detector-live.cpp

#include <visp3/core/vpConfig.h>
#include <visp3/core/vpImageConvert.h>
#include <visp3/detection/vpDetectorDataMatrixCode.h>
#include <visp3/detection/vpDetectorQRCode.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#ifdef VISP_HAVE_MODULE_SENSOR
#include <visp3/sensor/vpV4l2Grabber.h>
#endif
 
#if defined(HAVE_OPENCV_VIDEOIO)
#include <opencv2/videoio.hpp>
#endif
 
int main(int argc, const char **argv)
{
#if (defined(VISP_HAVE_V4L2) || defined(HAVE_OPENCV_VIDEOIO)) && (defined(VISP_HAVE_ZBAR) || defined(VISP_HAVE_DMTX))
  int opt_device = 0;
  int opt_barcode = 0; // 0=QRCode, 1=DataMatrix
 
  for (int i = 0; i < argc; i++) {
    if (std::string(argv[i]) == "--device")
      opt_device = atoi(argv[i + 1]);
    else if (std::string(argv[i]) == "--code-type")
      opt_barcode = atoi(argv[i + 1]);
    else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
      std::cout << "Usage: " << argv[0]
        << " [--device <camera number>] [--code-type <0 for QR code | "
        "1 for DataMatrix code>] [--help] [-h]"
        << std::endl;
      return EXIT_SUCCESS;
    }
  }
  std::cout << "Use device: " << opt_device << std::endl;
 
  try {
    vpImage<unsigned char> I; // for gray images
 
#if defined(VISP_HAVE_V4L2)
    vpV4l2Grabber g;
    std::ostringstream device;
    device << "/dev/video" << opt_device;
    g.setDevice(device.str());
    g.setScale(1);
    g.acquire(I);
#elif defined(HAVE_OPENCV_VIDEOIO)
    cv::VideoCapture cap(opt_device); // open the default camera
    if (!cap.isOpened()) {            // check if we succeeded
      std::cout << "Failed to open the camera" << std::endl;
      return EXIT_FAILURE;
    }
    cv::Mat frame;
    cap >> frame; // get a new frame from camera
    vpImageConvert::convert(frame, I);
#endif
 
#if defined(VISP_HAVE_X11)
    vpDisplayX d(I);
#elif defined(VISP_HAVE_GDI)
    vpDisplayGDI d(I);
#elif defined(HAVE_OPENCV_HIGHGUI)
    vpDisplayOpenCV d(I);
#endif
    vpDisplay::setTitle(I, "ViSP viewer");
 
    vpDetectorBase *detector = nullptr;
#if (defined(VISP_HAVE_ZBAR) && defined(VISP_HAVE_DMTX))
    if (opt_barcode == 0)
      detector = new vpDetectorQRCode;
    else
      detector = new vpDetectorDataMatrixCode;
#elif defined(VISP_HAVE_ZBAR)
    detector = new vpDetectorQRCode;
    (void)opt_barcode;
#elif defined(VISP_HAVE_DMTX)
    detector = new vpDetectorDataMatrixCode;
    (void)opt_barcode;
#endif
 
    for (;;) {
#if defined(VISP_HAVE_V4L2)
      g.acquire(I);
#elif defined(HAVE_OPENCV_VIDEOIO)
      cap >> frame; // get a new frame from camera
      vpImageConvert::convert(frame, I);
#endif
      vpDisplay::display(I);
 
      bool status = detector->detect(I);
      std::ostringstream legend;
      legend << detector->getNbObjects() << " bar code detected";
      vpDisplay::displayText(I, 10, 10, legend.str(), vpColor::red);
 
      if (status) {
        for (size_t i = 0; i < detector->getNbObjects(); i++) {
          std::vector<vpImagePoint> p = detector->getPolygon(i);
          vpRect bbox = detector->getBBox(i);
          vpDisplay::displayRectangle(I, bbox, vpColor::green);
          vpDisplay::displayText(I, (int)bbox.getTop() - 20, (int)bbox.getLeft(),
                                 "Message: \"" + detector->getMessage(i) + "\"", vpColor::red);
          for (size_t j = 0; j < p.size(); j++) {
            vpDisplay::displayCross(I, p[j], 14, vpColor::red, 3);
            std::ostringstream number;
            number << j;
            vpDisplay::displayText(I, p[j] + vpImagePoint(10, 0), number.str(), vpColor::blue);
          }
        }
      }
 
      vpDisplay::displayText(I, (int)I.getHeight() - 25, 10, "Click to quit...", vpColor::red);
      vpDisplay::flush(I);
      if (vpDisplay::getClick(I, false)) // a click to exit
        break;
    }
    delete detector;
  }
  catch (const vpException &e) {
    std::cout << "Catch an exception: " << e << std::endl;
  }
#else
  (void)argc;
  (void)argv;
#endif
}