tutorial-face-detector.cpp

#include <visp3/core/vpConfig.h>
#include <visp3/gui/vpDisplayFactory.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) && \
  (((VISP_HAVE_OPENCV_VERSION < 0x050000) && defined(HAVE_OPENCV_OBJDETECT)) || \
   ((VISP_HAVE_OPENCV_VERSION >= 0x050000) && defined(HAVE_OPENCV_XOBJDETECT)))
#ifdef ENABLE_VISP_NAMESPACE
  using namespace VISP_NAMESPACE_NAME;
#endif
#if (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
  std::shared_ptr<vpDisplay> display;
#else
  vpDisplay *display = nullptr;
#endif
  try {
    std::string opt_face_cascade_name = "./haarcascade_frontalface_alt.xml";
    std::string opt_video = "video.mp4";
 
    for (int i = 1; i < argc; i++) {
      if (std::string(argv[i]) == "--haar" && i + 1 < argc) {
        opt_face_cascade_name = std::string(argv[++i]);
      }
      else if (std::string(argv[i]) == "--video" && i + 1 < argc) {
        opt_video = std::string(argv[++i]);
      }
      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 (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
    display = vpDisplayFactory::createDisplay(I);
#else
    display = vpDisplayFactory::allocateDisplay(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, static_cast<int>(bbox.getTop()) - 10, static_cast<int>(bbox.getLeft()),
                                 "Message: \"" + face_detector.getMessage(i) + "\"", vpColor::red);
        }
      }
      vpDisplay::displayText(I, static_cast<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;
  }
#if (VISP_CXX_STANDARD < VISP_CXX_STANDARD_11)
  if (display != nullptr) {
    delete display;
  }
#endif
#else
 
#if !defined(HAVE_OPENCV_HIGHGUI)
  std::cout << "This tutorial needs OpenCV highgui module that is missing." << std::endl;
#endif
#if !defined(HAVE_OPENCV_IMGPROC)
  std::cout << "This tutorial needs OpenCV imgproc module that is missing." << std::endl;
#endif
#if defined(VISP_HAVE_OPENCV) && (VISP_HAVE_OPENCV_VERSION < 0x050000) && !defined(HAVE_OPENCV_OBJDETECT)
  std::cout << "This tutorial needs OpenCV objdetect module that is missing." << std::endl;
#endif
#if defined(VISP_HAVE_OPENCV) && ((VISP_HAVE_OPENCV_VERSION >= 0x050000) && !defined(HAVE_OPENCV_XOBJDETECT))
  std::cout << "This tutorial needs OpenCV xobjdetect module that is missing." << std::endl;
#endif
 
  (void)argc;
  (void)argv;
#endif
}