Visual Servoing Platform  version 3.2.0 under development (2018-12-12)
tutorial-face-detector-live.cpp
#include <visp3/core/vpConfig.h>
#include <visp3/detection/vpDetectorFace.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
int main(int argc, const char *argv[])
{
#if (VISP_HAVE_OPENCV_VERSION >= 0x020200)
try {
std::string opt_face_cascade_name = "./haarcascade_frontalface_alt.xml";
unsigned int opt_device = 0;
unsigned int opt_scale = 2; // Default value is 2 in the constructor. Turn
// it to 1 to avoid subsampling
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]) == "--device")
opt_device = (unsigned int)atoi(argv[i + 1]);
else if (std::string(argv[i]) == "--scale")
opt_scale = (unsigned int)atoi(argv[i + 1]);
else if (std::string(argv[i]) == "--help") {
std::cout << "Usage: " << argv[0]
<< " [--haar <haarcascade xml filename>] [--device <camera "
"device>] [--scale <subsampling factor>] [--help]"
<< std::endl;
return 0;
}
}
vpImage<unsigned char> I; // for gray images
#if defined(VISP_HAVE_V4L2)
std::ostringstream device;
device << "/dev/video" << opt_device;
g.setDevice(device.str());
g.setScale(opt_scale); // Default value is 2 in the constructor. Turn it
// to 1 to avoid subsampling
g.acquire(I);
#elif defined(VISP_HAVE_OPENCV)
cv::VideoCapture cap(opt_device); // open the default camera
#if (VISP_HAVE_OPENCV_VERSION >= 0x030000)
int width = (int)cap.get(cv::CAP_PROP_FRAME_WIDTH);
int height = (int)cap.get(cv::CAP_PROP_FRAME_HEIGHT);
cap.set(cv::CAP_PROP_FRAME_WIDTH, width / opt_scale);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, height / opt_scale);
#else
int width = cap.get(CV_CAP_PROP_FRAME_WIDTH);
int height = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
cap.set(CV_CAP_PROP_FRAME_WIDTH, width / opt_scale);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, height / opt_scale);
#endif
if (!cap.isOpened()) { // check if we succeeded
std::cout << "Failed to open the camera" << std::endl;
return -1;
}
cv::Mat frame;
cap >> frame; // get a new frame from camera
#endif
#if defined(VISP_HAVE_X11)
vpDisplayX d(I);
#elif defined(VISP_HAVE_GDI)
#elif defined(VISP_HAVE_OPENCV)
#endif
vpDisplay::setTitle(I, "ViSP viewer");
vpDetectorFace face_detector;
face_detector.setCascadeClassifierFile(opt_face_cascade_name);
while (1) {
double t = vpTime::measureTimeMs();
#if defined(VISP_HAVE_V4L2)
g.acquire(I);
bool face_found = face_detector.detect(I);
#else
cap >> frame; // get a new frame from camera
bool face_found = face_detector.detect(frame); // We pass frame to avoid an internal image conversion
#endif
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::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);
if (vpDisplay::getClick(I, false)) // a click to exit
break;
std::cout << "Loop time: " << vpTime::measureTimeMs() - t << " ms" << std::endl;
}
} catch (const vpException &e) {
std::cout << e.getMessage() << std::endl;
}
#else
(void)argc;
(void)argv;
#endif
}