tutorial-apriltag-detector-live.cpp

#include <visp3/core/vpConfig.h>
#ifdef VISP_HAVE_MODULE_SENSOR
#include <visp3/sensor/vpV4l2Grabber.h>
#include <visp3/sensor/vp1394CMUGrabber.h>
#include <visp3/sensor/vp1394TwoGrabber.h>
#include <visp3/sensor/vpFlyCaptureGrabber.h>
#include <visp3/sensor/vpRealSense2.h>
#endif
#include <visp3/detection/vpDetectorAprilTag.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/core/vpXmlParserCamera.h>

//#undef VISP_HAVE_V4L2
//#undef VISP_HAVE_DC1394
//#undef VISP_HAVE_CMU1394
//#undef VISP_HAVE_FLYCAPTURE
//#undef VISP_HAVE_REALSENSE2
//#undef VISP_HAVE_OPENCV

int main(int argc, const char **argv)
{
#if defined(VISP_HAVE_APRILTAG) && \
  (defined(VISP_HAVE_V4L2) || defined(VISP_HAVE_DC1394) || defined(VISP_HAVE_CMU1394) || (VISP_HAVE_OPENCV_VERSION >= 0x020100) || \
  defined(VISP_HAVE_FLYCAPTURE) || defined(VISP_HAVE_REALSENSE2) )

  int opt_device = 0;             // For OpenCV and V4l2 grabber to set the camera device
  vpDetectorAprilTag::vpAprilTagFamily tagFamily = vpDetectorAprilTag::TAG_36h11;
  vpDetectorAprilTag::vpPoseEstimationMethod poseEstimationMethod = vpDetectorAprilTag::HOMOGRAPHY_VIRTUAL_VS;
  double tagSize = 0.053;
  float quad_decimate = 1.0;
  int nThreads = 1;
  std::string intrinsic_file = "";
  std::string camera_name = "";
  bool display_tag = false;
  int color_id = -1;
  unsigned int thickness = 2;

#if !(defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV))
  bool display_off = true;
  std::cout << "Warning: There is no 3rd party (X11, GDI or openCV) to dislay images..." << std::endl;
#else
  bool display_off = false;
#endif

  vpImage<unsigned char> I;

  for (int i = 1; i < argc; i++) {
    if (std::string(argv[i]) == "--pose_method" && i + 1 < argc) {
      poseEstimationMethod = (vpDetectorAprilTag::vpPoseEstimationMethod)atoi(argv[i + 1]);
    } else if (std::string(argv[i]) == "--tag_size" && i + 1 < argc) {
      tagSize = atof(argv[i + 1]);
    } else if (std::string(argv[i]) == "--camera_device" && i + 1 < argc) {
      opt_device = atoi(argv[i + 1]);
    } else if (std::string(argv[i]) == "--quad_decimate" && i + 1 < argc) {
      quad_decimate = (float)atof(argv[i + 1]);
    } else if (std::string(argv[i]) == "--nthreads" && i + 1 < argc) {
      nThreads = atoi(argv[i + 1]);
    } else if (std::string(argv[i]) == "--intrinsic" && i + 1 < argc) {
      intrinsic_file = std::string(argv[i + 1]);
    } else if (std::string(argv[i]) == "--camera_name" && i + 1 < argc) {
      camera_name = std::string(argv[i + 1]);
    } else if (std::string(argv[i]) == "--display_tag") {
      display_tag = true;
    } else if (std::string(argv[i]) == "--display_off") {
      display_off = true;
    } else if (std::string(argv[i]) == "--color" && i + 1 < argc) {
      color_id = atoi(argv[i+1]);
    } else if (std::string(argv[i]) == "--thickness" && i + 1 < argc) {
      thickness = (unsigned int) atoi(argv[i+1]);
    } else if (std::string(argv[i]) == "--tag_family" && i + 1 < argc) {
      tagFamily = (vpDetectorAprilTag::vpAprilTagFamily)atoi(argv[i + 1]);
    } else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
      std::cout << "Usage: " << argv[0]
                << " [--camera_device <camera device> (default: 0)]"
                << " [--tag_size <tag_size in m> (default: 0.053)]"
                   " [--quad_decimate <quad_decimate> (default: 1)]"
                   " [--nthreads <nb> (default: 1)]"
                   " [--intrinsic <intrinsic file> (default: empty)]"
                   " [--camera_name <camera name>]  (default: empty)"
                   " [--pose_method <method> (0: HOMOGRAPHY, 1: HOMOGRAPHY_VIRTUAL_VS, "
                   " 2: DEMENTHON_VIRTUAL_VS, 3: LAGRANGE_VIRTUAL_VS, "
                   " 4: BEST_RESIDUAL_VIRTUAL_VS) (default: 0)]"
                   " [--tag_family <family> (0: TAG_36h11, 1: TAG_36h10, 2: TAG_36ARTOOLKIT,"
                   " 3: TAG_25h9, 4: TAG_25h7, 5: TAG_16h5) (default: 0)]"
                   " [--display_tag]";
#if (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV))
      std::cout << " [--display_off] [--color <color id>] [--thickness <line thickness>]";
#endif
      std::cout << " [--help]" << std::endl;
      return EXIT_SUCCESS;
    }
  }

  try {
    vpCameraParameters cam;
    cam.initPersProjWithoutDistortion(615.1674805, 615.1675415, 312.1889954, 243.4373779);
#ifdef VISP_HAVE_XML2
    vpXmlParserCamera parser;
    if (!intrinsic_file.empty() && !camera_name.empty())
      parser.parse(cam, intrinsic_file, camera_name, vpCameraParameters::perspectiveProjWithoutDistortion);
#endif

#if defined(VISP_HAVE_V4L2)
    vpV4l2Grabber g;
    std::ostringstream device;
    device << "/dev/video" << opt_device;
    std::cout << "Use Video 4 Linux grabber on device " << device.str() << std::endl;
    g.setDevice(device.str());
    g.setScale(1);
    g.open(I);
#elif defined(VISP_HAVE_DC1394)
    (void)opt_device; // To avoid non used warning
    std::cout << "Use DC1394 grabber" << std::endl;
    vp1394TwoGrabber g;
    g.open(I);
#elif defined(VISP_HAVE_CMU1394)
    (void)opt_device; // To avoid non used warning
    std::cout << "Use CMU1394 grabber" << std::endl;
    vp1394CMUGrabber g;
    g.open(I);
#elif defined(VISP_HAVE_FLYCAPTURE)
    (void)opt_device; // To avoid non used warning
    std::cout << "Use FlyCapture grabber" << std::endl;
    vpFlyCaptureGrabber g;
    g.open(I);
#elif defined(VISP_HAVE_REALSENSE2)
    (void)opt_device; // To avoid non used warning
    std::cout << "Use Realsense 2 grabber" << std::endl;
    vpRealSense2 g;
    rs2::config config;
    config.disable_stream(RS2_STREAM_DEPTH);
    config.disable_stream(RS2_STREAM_INFRARED);
    config.enable_stream(RS2_STREAM_COLOR, 640, 480, RS2_FORMAT_RGBA8, 30);
    g.open(config);
    g.acquire(I);

    std::cout << "Read camera parameters from Realsense device" << std::endl;
    cam = g.getCameraParameters(RS2_STREAM_COLOR, vpCameraParameters::perspectiveProjWithoutDistortion);
#elif defined(VISP_HAVE_OPENCV)
    std::cout << "Use OpenCV grabber on device " << opt_device << std::endl;
    cv::VideoCapture g(opt_device); // Open the default camera
    if (!g.isOpened()) {            // Check if we succeeded
      std::cout << "Failed to open the camera" << std::endl;
      return -1;
    }
    cv::Mat frame;
    g >> frame; // get a new frame from camera
    vpImageConvert::convert(frame, I);
#endif

    std::cout << "cam:\n" << cam << std::endl;
    std::cout << "poseEstimationMethod: " << poseEstimationMethod << std::endl;
    std::cout << "tagFamily: " << tagFamily << std::endl;

    vpDisplay *d = NULL;
    if (! display_off) {
#ifdef VISP_HAVE_X11
      d = new vpDisplayX(I);
#elif defined(VISP_HAVE_GDI)
      d = new vpDisplayGDI(I);
#elif defined(VISP_HAVE_OPENCV)
      d = new vpDisplayOpenCV(I);
#endif
    }

    vpDetectorAprilTag detector(tagFamily);

    detector.setAprilTagQuadDecimate(quad_decimate);
    detector.setAprilTagPoseEstimationMethod(poseEstimationMethod);
    detector.setAprilTagNbThreads(nThreads);
    detector.setDisplayTag(display_tag, color_id < 0 ? vpColor::none : vpColor::getColor(color_id), thickness);

    std::vector<double> time_vec;
    for (;;) {
#if defined(VISP_HAVE_V4L2) || defined(VISP_HAVE_DC1394) || defined(VISP_HAVE_CMU1394) || defined(VISP_HAVE_FLYCAPTURE) || defined(VISP_HAVE_REALSENSE2)
      g.acquire(I);
#elif defined(VISP_HAVE_OPENCV)
      g >> frame;
      vpImageConvert::convert(frame, I);
#endif

      vpDisplay::display(I);

      double t = vpTime::measureTimeMs();
      std::vector<vpHomogeneousMatrix> cMo_vec;
      detector.detect(I, tagSize, cam, cMo_vec);
      t = vpTime::measureTimeMs() - t;
      time_vec.push_back(t);

      std::stringstream ss;
      ss << "Detection time: " << t << " ms for " << detector.getNbObjects() << " tags";
      vpDisplay::displayText(I, 40, 20, ss.str(), vpColor::red);

      for (size_t i = 0; i < cMo_vec.size(); i++) {
        vpDisplay::displayFrame(I, cMo_vec[i], cam, tagSize / 2, vpColor::none, 3);
      }

      vpDisplay::displayText(I, 20, 20, "Click to quit.", vpColor::red);
      vpDisplay::flush(I);
      if (vpDisplay::getClick(I, false))
        break;
    }

    std::cout << "Benchmark computation time" << std::endl;
    std::cout << "Mean / Median / Std: " << vpMath::getMean(time_vec) << " ms"
              << " ; " << vpMath::getMedian(time_vec) << " ms"
              << " ; " << vpMath::getStdev(time_vec) << " ms" << std::endl;

    if (! display_off)
      delete d;

  } catch (const vpException &e) {
    std::cerr << "Catch an exception: " << e.getMessage() << std::endl;
  }

  return EXIT_SUCCESS;
#else
  (void)argc;
  (void)argv;
#ifndef VISP_HAVE_APRILTAG
  std::cout << "Enable Apriltag support, configure and build ViSP to run this tutorial" << std::endl;
#else
  std::cout << "Install a 3rd party dedicated to frame grabbing (dc1394, cmu1394, v4l2, OpenCV, FlyCapture, Realsense2), configure and build ViSP again to use this example" << std::endl;
#endif
#endif
  return EXIT_SUCCESS;
}