Visual Servoing Platform  version 3.5.1 under development (2022-11-26)
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 <visp3/imgproc/vpImgproc.h>
#endif
int main(int argc, const char **argv)
{
#if defined(VISP_HAVE_MODULE_IMGPROC) && (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV))
std::string input_filename = "img.pgm";
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;
}
}
vpImageIo::read(I, input_filename);
#ifdef VISP_HAVE_X11
vpDisplayX d, d2;
#elif defined(VISP_HAVE_GDI)
vpDisplayGDI d, d2;
#elif defined(VISP_HAVE_OPENCV)
#endif
d.init(I, 0, 0, "Input image");
vpImage<int> labels;
int nbComponents = 0;
vp::connectedComponents(I, labels, nbComponents, connexity);
std::cout << "nbComponents=" << nbComponents << std::endl;
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);
}
}
}
d2.init(I_conn, I.getWidth(), 10, "Connected components");
vpDisplay::displayText(I_conn, 20, 20, "Click to quit.", vpColor::red);
return EXIT_SUCCESS;
#else
(void)argc;
(void)argv;
return 0;
#endif
}
static vpColor getColor(const unsigned int &i)
Definition: vpColor.h:313
static const vpColor red
Definition: vpColor.h:217
Display for windows using GDI (available on any windows 32 platform).
Definition: vpDisplayGDI.h:129
The vpDisplayOpenCV allows to display image using the OpenCV library. Thus to enable this class OpenC...
Use the X11 console to display images on unix-like OS. Thus to enable this class X11 should be instal...
Definition: vpDisplayX.h:135
void init(vpImage< unsigned char > &I, int win_x=-1, int win_y=-1, const std::string &win_title="")
static bool getClick(const vpImage< unsigned char > &I, bool blocking=true)
static void display(const vpImage< unsigned char > &I)
static void flush(const vpImage< unsigned char > &I)
static void displayText(const vpImage< unsigned char > &I, const vpImagePoint &ip, const std::string &s, const vpColor &color)
static void read(vpImage< unsigned char > &I, const std::string &filename, int backend=IO_DEFAULT_BACKEND)
Definition: vpImageIo.cpp:148
unsigned int getWidth() const
Definition: vpImage.h:246
unsigned int getHeight() const
Definition: vpImage.h:188
Definition: vpRGBa.h:67
VISP_EXPORT void connectedComponents(const vpImage< unsigned char > &I, vpImage< int > &labels, int &nbComponents, const vpImageMorphology::vpConnexityType &connexity=vpImageMorphology::CONNEXITY_4)