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//! \example tutorial-connected-components.cpp
#include <cstdlib>
#include <iostream>
#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/io/vpImageIo.h>
#if defined(VISP_HAVE_MODULE_IMGPROC)
//! [Include]
#include <visp3/imgproc/vpImgproc.h>
//! [Include]
#endif
int main(int argc, const char **argv)
{
//! [Macro defined]
#if defined(VISP_HAVE_MODULE_IMGPROC) && (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV))
//! [Macro defined]
std::string input_filename = "img.pgm";
vpImageMorphology::vpConnexityType connexity = vpImageMorphology::CONNEXITY_4;
for (int i = 1; i < argc; i++) {
if (std::string(argv[i]) == "--input" && i + 1 < argc) {
input_filename = std::string(argv[i + 1]);
} else if (std::string(argv[i]) == "--connexity" && i + 1 < argc) {
connexity = (vpImageMorphology::vpConnexityType)atoi(argv[i + 1]);
} else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
std::cout << "Usage: " << argv[0]
<< " [--input <input image>] [--connexity <0: 4-connexity, "
"1: 8-connexity>] [--help]"
<< std::endl;
return EXIT_SUCCESS;
}
}
//! [Read]
vpImage<unsigned char> I;
vpImageIo::read(I, input_filename);
//! [Read]
#ifdef VISP_HAVE_X11
vpDisplayX d, d2;
#elif defined(VISP_HAVE_GDI)
vpDisplayGDI d, d2;
#elif defined(HAVE_OPENCV_HIGHGUI)
vpDisplayOpenCV d, d2;
#endif
d.init(I, 0, 0, "Input image");
//! [Connected components]
vpImage<int> labels;
int nbComponents = 0;
vp::connectedComponents(I, labels, nbComponents, connexity);
std::cout << "nbComponents=" << nbComponents << std::endl;
//! [Connected components]
//! [Draw connected components]
vpImage<vpRGBa> I_conn(I.getHeight(), I.getWidth());
for (unsigned int i = 0; i < I_conn.getHeight(); i++) {
for (unsigned int j = 0; j < I_conn.getWidth(); j++) {
if (labels[i][j] != 0) {
I_conn[i][j] =
vpRGBa(vpColor::getColor((unsigned int)labels[i][j]).R, vpColor::getColor((unsigned int)labels[i][j]).G,
vpColor::getColor((unsigned int)labels[i][j]).B);
}
}
}
//! [Draw connected components]
d2.init(I_conn, I.getWidth(), 10, "Connected components");
vpDisplay::display(I);
vpDisplay::display(I_conn);
vpDisplay::displayText(I_conn, 20, 20, "Click to quit.", vpColor::red);
vpDisplay::flush(I);
vpDisplay::flush(I_conn);
vpDisplay::getClick(I_conn);
#else
(void)argc;
(void)argv;
#endif
return EXIT_SUCCESS;
}
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