tutorial-contour.cpp

 
#include <cstdlib>
#include <iostream>
#include <visp3/core/vpConfig.h>
#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayFactory.h>
#include <visp3/io/vpImageIo.h>
 
#if defined(VISP_HAVE_MODULE_IMGPROC) && defined(VISP_HAVE_DISPLAY)
#include <visp3/imgproc/vpImgproc.h>
 
#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif
 
namespace
{
void displayContourInfo(const VISP_NAMESPACE_NAME::vpContour &contour, int level)
{
  std::cout << "\nContour:" << std::endl;
  std::cout << "\tlevel: " << level << std::endl;
  std::cout << "\tcontour type: " << (contour.m_contourType == VISP_NAMESPACE_NAME::CONTOUR_OUTER ? "outer contour" : "hole contour")
    << std::endl;
  std::cout << "\tcontour size: " << contour.m_points.size() << std::endl;
  std::cout << "\tnb children: " << contour.m_children.size() << std::endl;
 
  for (std::vector<VISP_NAMESPACE_NAME::vpContour *>::const_iterator it = contour.m_children.begin(); it != contour.m_children.end();
       ++it) {
    displayContourInfo(**it, level + 1);
  }
}

void drawContoursTree(vpImage<vpRGBa> &I, const VISP_NAMESPACE_NAME::vpContour &contour)
{
  std::vector<std::vector<vpImagePoint> > contours;
  contours.push_back(contour.m_points);
  VISP_NAMESPACE_NAME::drawContours(I, contours, contour.m_contourType == VISP_NAMESPACE_NAME::CONTOUR_OUTER ? vpColor::red : vpColor::green);
 
  for (std::vector<VISP_NAMESPACE_NAME::vpContour *>::const_iterator it = contour.m_children.begin(); it != contour.m_children.end();
       ++it) {
    drawContoursTree(I, **it);
  }
}
} // namespace
#endif
 
int main(int argc, const char **argv)
{
#if defined(VISP_HAVE_MODULE_IMGPROC) && defined(VISP_HAVE_DISPLAY)
  std::string input_filename = "grid36-03.pgm";
  bool white_foreground = false;
  VISP_NAMESPACE_NAME::vpContourRetrievalType extraction_method = VISP_NAMESPACE_NAME::CONTOUR_RETR_TREE;
 
  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]) == "--white_foreground") {
      white_foreground = true;
    }
    else if (std::string(argv[i]) == "--method" && i + 1 < argc) {
      extraction_method = (VISP_NAMESPACE_NAME::vpContourRetrievalType)atoi(argv[i + 1]);
    }
    else if (std::string(argv[i]) == "--help" || std::string(argv[i]) == "-h") {
      std::cout << "Usage: " << argv[0]
        << " [--input <input image>] [--method <0: "
        "CONTOUR_RETR_TREE, 1: CONTOUR_RETR_LIST, 2: "
        "CONTOUR_RETR_EXTERNAL>]"
        " [--white_foreground] [--help]"
        << std::endl;
      return EXIT_SUCCESS;
    }
  }

  vpImage<unsigned char> I;
  vpImageIo::read(I, input_filename);
  vpImage<unsigned char> I_bin(I.getHeight(), I.getWidth());
 
  vpImage<vpRGBa> I_draw_contours(I.getHeight(), I.getWidth());
 
#if (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
  std::shared_ptr<vpDisplay> display = vpDisplayFactory::createDisplay(I_bin, 0, 0, "After binarisation");
  std::shared_ptr<vpDisplay> display2 = vpDisplayFactory::createDisplay(I_draw_contours, I_bin.getWidth(), 10, "Contours");
#else
  vpDisplay *display = vpDisplayFactory::allocateDisplay(I_bin, 0, 0, "After binarisation");
  vpDisplay *display2 = vpDisplayFactory::allocateDisplay(I_draw_contours, I_bin.getWidth(), 10, "Contours");
#endif

  VISP_NAMESPACE_NAME::autoThreshold(I, VISP_NAMESPACE_NAME::AUTO_THRESHOLD_OTSU, white_foreground ? 0 : 1, white_foreground ? 1 : 0);
  for (unsigned int i = 0; i < I_bin.getSize(); i++) {
    I_bin.bitmap[i] = 255 * I.bitmap[i];
  }

  VISP_NAMESPACE_NAME::vpContour vp_contours;
  std::vector<std::vector<vpImagePoint> > contours;
  VISP_NAMESPACE_NAME::findContours(I, vp_contours, contours, extraction_method);

  VISP_NAMESPACE_NAME::drawContours(I_draw_contours, contours, vpColor::red);
 
  vpDisplay::display(I_bin);
  vpDisplay::display(I_draw_contours);
  vpDisplay::displayText(I_draw_contours, 20, 20, "Click to draw outer / hole contours.", vpColor::red);
  vpDisplay::flush(I_bin);
  vpDisplay::flush(I_draw_contours);
  vpDisplay::getClick(I_draw_contours);
 
  I_draw_contours = vpRGBa(0);
  drawContoursTree(I_draw_contours, vp_contours);
  displayContourInfo(vp_contours, 0);
 
  vpDisplay::display(I_bin);
  vpDisplay::display(I_draw_contours);
  vpDisplay::displayText(I_draw_contours, 20, 20, "Click to quit.", vpColor::red);
  vpDisplay::displayText(I_draw_contours, 20, I_draw_contours.getWidth() - 200, "Outer contour", vpColor::red);
  vpDisplay::displayText(I_draw_contours, 20, I_draw_contours.getWidth() - 100, "Hole contour", vpColor::green);
  vpDisplay::flush(I_bin);
  vpDisplay::flush(I_draw_contours);
  vpDisplay::getClick(I_draw_contours);
 
#if (VISP_CXX_STANDARD < VISP_CXX_STANDARD_11) && defined(VISP_HAVE_DISPLAY)
  if (display != nullptr) {
    delete display;
  }
 
  if (display2 != nullptr) {
    delete display2;
  }
#endif
#else
  (void)argc;
  (void)argv;
#endif
  return EXIT_SUCCESS;
}