Visual Servoing Platform  version 3.2.0 under development (2018-08-18)
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
int main(int argc, const char **argv)
{
#if (VISP_HAVE_OPENCV_VERSION >= 0x020100) && (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::cout << "Usage: " << argv[0]
<< " [--device <camera number>] [--code-type <0 for QRcode | "
"1 for DataMatrix>] [--help]"
<< std::endl;
return 0;
}
}
std::cout << "Use device: " << opt_device << std::endl;
try {
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(1);
g.acquire(I);
#elif defined(VISP_HAVE_OPENCV)
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 -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");
vpDetectorBase *detector = NULL;
#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);
#else
cap >> frame; // get a new frame from camera
#endif
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::displayText(I, (int)bbox.getTop() - 20, (int)bbox.getLeft(),
"Message: \"" + detector->getMessage(i) + "\"", vpColor::red);
for (size_t j = 0; j < p.size(); j++) {
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);
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
}