tutorial-face-detector.cpp

#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/detection/vpDetectorFace.h>
#include <visp3/io/vpVideoReader.h>
 
int main(int argc, const char *argv[])
{
#if defined(VISP_HAVE_OPENCV) && defined(HAVE_OPENCV_HIGHGUI) && defined(HAVE_OPENCV_IMGPROC) && defined(HAVE_OPENCV_OBJDETECT)
  try {
    std::string opt_face_cascade_name = "./haarcascade_frontalface_alt.xml";
    std::string opt_video = "video.mp4";
 
    for (int i = 0; i < argc; i++) {
      if (std::string(argv[i]) == "--haar")
        opt_face_cascade_name = std::string(argv[i + 1]);
      else if (std::string(argv[i]) == "--video")
        opt_video = std::string(argv[i + 1]);
      else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
        std::cout << "Usage: " << argv[0] << " [--haar <haarcascade xml filename>] [--video <input video file>]"
                  << " [--help] [-h]" << std::endl;
        return EXIT_SUCCESS;
      }
    }
 
    vpImage<unsigned char> I;
 
    vpVideoReader g;
    g.setFileName(opt_video);
    g.open(I);
 
#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");
 
    vpDetectorFace face_detector;
    face_detector.setCascadeClassifierFile(opt_face_cascade_name);
 
    bool exit_requested = false;
    while (!g.end() && !exit_requested) {
      g.acquire(I);
 
      vpDisplay::display(I);
      bool face_found = face_detector.detect(I);
 
      if (face_found) {
        std::ostringstream text;
        text << "Found " << face_detector.getNbObjects() << " face(s)";
        vpDisplay::displayText(I, 10, 10, text.str(), vpColor::red);
        for (size_t i = 0; i < face_detector.getNbObjects(); i++) {
          vpRect bbox = face_detector.getBBox(i);
          vpDisplay::displayRectangle(I, bbox, vpColor::green, false, 4);
          vpDisplay::displayText(I, (int)bbox.getTop() - 10, (int)bbox.getLeft(),
                                 "Message: \"" + face_detector.getMessage(i) + "\"", vpColor::red);
        }
      }
      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
        exit_requested = true;
    }
    if (!exit_requested)
      vpDisplay::getClick(I);
  } catch (const vpException &e) {
    std::cout << e.getMessage() << std::endl;
  }
#else
  (void)argc;
  (void)argv;
#endif
}