trackDot.cpp

Example of dot tracking on an image sequence using vpDot.

/****************************************************************************
 *
 * ViSP, open source Visual Servoing Platform software.
 * Copyright (C) 2005 - 2019 by Inria. All rights reserved.
 *
 * This software is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Example of dot tracking.
 *
 * Authors:
 * Eric Marchand
 * Fabien Spindler
 *
 *****************************************************************************/

#include <visp3/core/vpConfig.h>
#include <visp3/core/vpDebug.h>

#include <iomanip>
#include <sstream>
#include <stdio.h>
#include <stdlib.h>

#if defined(VISP_HAVE_MODULE_BLOB) &&                                                                                  \
    (defined(VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI) || defined(VISP_HAVE_OPENCV))

#include <visp3/blob/vpDot.h>
#include <visp3/core/vpImage.h>
#include <visp3/core/vpImagePoint.h>
#include <visp3/core/vpIoTools.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/io/vpImageIo.h>
#include <visp3/io/vpParseArgv.h>

// List of allowed command line options
#define GETOPTARGS "cdf:i:n:p:s:h"

void usage(const char *name, const char *badparam, std::string ipath, std::string ppath, unsigned first,
           unsigned nimages, unsigned step);
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath, unsigned &first, unsigned &nimages,
                unsigned &step, bool &click_allowed, bool &display);

void usage(const char *name, const char *badparam, std::string ipath, std::string ppath, unsigned first,
           unsigned nimages, unsigned step)
{
  fprintf(stdout, "\n\
Test dot tracking.\n\
\n\
SYNOPSIS\n\
  %s [-i <test image path>] [-p <personal image path>]\n\
     [-f <first image>] [-n <number of images>] [-s <step>]\n\
     [-c] [-d] [-h]\n", name);

  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -i <input image path>                                %s\n\
     Set image input path.\n\
     From this path read images \n\
     \"mire-2/image.%%04d.pgm\". These \n\
     images come from ViSP-images-x.y.z.tar.gz available \n\
     on the ViSP website.\n\
     Setting the VISP_INPUT_IMAGE_PATH environment\n\
     variable produces the same behaviour than using\n\
     this option.\n\
 \n\
 -p <personal image path>                             %s\n\
     Specify a personal sequence containing images \n\
     to process.\n\
     By image sequence, we mean one file per image.\n\
     The following image file formats PNM (PGM P5, PPM P6)\n\
     are supported. The format is selected by analysing \n\
     the filename extension.\n\
     Example : \"C:/Temp/ViSP-images/cube/image.%%04d.pgm\"\n\
     %%04d is for the image numbering.\n\
 \n\
  -f <first image>                                     %u\n\
     First image number of the sequence.\n\
 \n\
  -n <number of images>                                %u\n\
     Number of images to load from the sequence.\n\
 \n\
  -s <step>                                            %u\n\
     Step between two images.\n\
\n\
  -c\n\
     Disable the mouse click. Useful to automaze the \n\
     execution of this program without humain intervention.\n\
\n\
  -d \n\
     Turn off the display.\n\
\n\
  -h\n\
     Print the help.\n", ipath.c_str(), ppath.c_str(), first, nimages, step);

  if (badparam)
    fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);
}
bool getOptions(int argc, const char **argv, std::string &ipath, std::string &ppath, unsigned &first, unsigned &nimages,
                unsigned &step, bool &click_allowed, bool &display)
{
  const char *optarg_;
  int c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {

    switch (c) {
    case 'c':
      click_allowed = false;
      break;
    case 'd':
      display = false;
      break;
    case 'i':
      ipath = optarg_;
      break;
    case 'p':
      ppath = optarg_;
      break;
    case 'f':
      first = (unsigned)atoi(optarg_);
      break;
    case 'n':
      nimages = (unsigned)atoi(optarg_);
      break;
    case 's':
      step = (unsigned)atoi(optarg_);
      break;
    case 'h':
      usage(argv[0], NULL, ipath, ppath, first, nimages, step);
      return false;
      break;

    default:
      usage(argv[0], optarg_, ipath, ppath, first, nimages, step);
      return false;
      break;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], NULL, ipath, ppath, first, nimages, step);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg_ << std::endl << std::endl;
    return false;
  }

  return true;
}

int main(int argc, const char **argv)
{
  try {
    std::string env_ipath;
    std::string opt_ipath;
    std::string ipath;
    std::string opt_ppath;
    std::string dirname;
    std::string filename;
    unsigned opt_first = 1;
    unsigned opt_nimages = 500;
    unsigned opt_step = 1;
    bool opt_click_allowed = true;
    bool opt_display = true;

    // Get the visp-images-data package path or VISP_INPUT_IMAGE_PATH
    // environment variable value
    env_ipath = vpIoTools::getViSPImagesDataPath();

    // Set the default input path
    if (!env_ipath.empty())
      ipath = env_ipath;

    // Read the command line options
    if (getOptions(argc, argv, opt_ipath, opt_ppath, opt_first, opt_nimages, opt_step, opt_click_allowed,
                   opt_display) == false) {
      exit(-1);
    }

    // Get the option values
    if (!opt_ipath.empty())
      ipath = opt_ipath;

    // Compare ipath and env_ipath. If they differ, we take into account
    // the input path comming from the command line option
    if (!opt_ipath.empty() && !env_ipath.empty() && opt_ppath.empty()) {
      if (ipath != env_ipath) {
        std::cout << std::endl << "WARNING: " << std::endl;
        std::cout << "  Since -i <visp image path=" << ipath << "> "
                  << "  is different from VISP_IMAGE_PATH=" << env_ipath << std::endl
                  << "  we skip the environment variable." << std::endl;
      }
    }

    // Test if an input path is set
    if (opt_ipath.empty() && env_ipath.empty() && opt_ppath.empty()) {
      usage(argv[0], NULL, ipath, opt_ppath, opt_first, opt_nimages, opt_step);
      std::cerr << std::endl << "ERROR:" << std::endl;
      std::cerr << "  Use -i <visp image path> option or set VISP_INPUT_IMAGE_PATH " << std::endl
                << "  environment variable to specify the location of the " << std::endl
                << "  image path where test images are located." << std::endl
                << "  Use -p <personal image path> option if you want to " << std::endl
                << "  use personal images." << std::endl
                << std::endl;

      exit(-1);
    }

    // Declare an image, this is a gray level image (unsigned char)
    // it size is not defined yet, it will be defined when the image will
    // read on the disk
    vpImage<unsigned char> I;

    unsigned iter = opt_first;
    std::ostringstream s;
    char cfilename[FILENAME_MAX];

    if (opt_ppath.empty()) {

      // Warning :
      // the image sequence is not provided with the ViSP package
      // therefore the program will return you an error :
      //  !!    vpImageIoPnm.cpp: readPGM(#210) :couldn't read file
      //        ViSP-images/mire-2/image.0001.pgm
      //  !!    vpDotExample.cpp: main(#95) :Error while reading the image
      //  terminate called after throwing an instance of 'vpImageException'
      //
      //  The sequence is available on the visp www site
      //  https://visp.inria.fr/download/
      //  in the download section. It is named "ViSP-images.tar.gz"

      // Set the path location of the image sequence
      dirname = vpIoTools::createFilePath(ipath, "mire-2");

      // Build the name of the image file

      s.setf(std::ios::right, std::ios::adjustfield);
      s << "image." << std::setw(4) << std::setfill('0') << iter << ".pgm";
      filename = vpIoTools::createFilePath(dirname, s.str());
    } else {

      sprintf(cfilename, opt_ppath.c_str(), iter);
      filename = cfilename;
    }

    // Read the PGM image named "filename" on the disk, and put the
    // bitmap into the image structure I.  I is initialized to the
    // correct size
    //
    // exception readPGM may throw various exception if, for example,
    // the file does not exist, or if the memory cannot be allocated
    try {
      vpCTRACE << "Load: " << filename << std::endl;

      vpImageIo::read(I, filename);
    } catch (...) {
      // an exception is throwned if an exception from readPGM has been
      // catched here this will result in the end of the program Note that
      // another error message has been printed from readPGM to give more
      // information about the error
      std::cerr << std::endl << "ERROR:" << std::endl;
      std::cerr << "  Cannot read " << filename << std::endl;
      std::cerr << "  Check your -i " << ipath << " option " << std::endl
                << "  or VISP_INPUT_IMAGE_PATH environment variable." << std::endl;
      exit(-1);
    }

// We open a window using either X11, GTK or GDI.
#if defined VISP_HAVE_X11
    vpDisplayX display;
#elif defined VISP_HAVE_GTK
    vpDisplayGTK display;
#elif defined VISP_HAVE_GDI
    vpDisplayGDI display;
#elif defined VISP_HAVE_OPENCV
    vpDisplayOpenCV display;
#endif

    if (opt_display) {
      // Display size is automatically defined by the image (I) size
      display.init(I, 100, 100, "Display...");
      // Display the image
      // The image class has a member that specify a pointer toward
      // the display that has been initialized in the display declaration
      // therefore is is no longuer necessary to make a reference to the
      // display variable.
      vpDisplay::display(I);
      vpDisplay::flush(I);
    }

    // by using setGraphics, we request to see the all the pixel of the dot
    vpDot d;
    if (opt_display) {
      // by using setGraphics, we request to see the all the pixel of the dot
      // in green on the screen.
      // It uses the overlay image plane.
      // The default of this setting is that it is time consumming
      d.setGraphics(true);
    } else {
      d.setGraphics(false);
    }
    // we also request to compute the dot moment m00, m10, m01, m11, m20, m02
    d.setComputeMoments(true);
    d.setConnexity(vpDot::CONNEXITY_8);

    if (opt_display && opt_click_allowed) {
      // tracking is initalized
      // if no other parameters are given to the iniTracking(..) method
      // a right mouse click on the dot is expected
      std::cout << "Click on a white dot you want to track..." << std::endl;
      d.initTracking(I);
    } else {
      // dot location can also be specified explicitely in the
      // initTracking method : d.initTracking(I,ip) where ip is the
      // image point from which the dot is searched
      vpImagePoint ip;
      ip.set_u(160);
      ip.set_v(212);
      d.initTracking(I, ip);
    }

    vpImagePoint cog;
    while (iter < opt_first + opt_nimages * opt_step) {
      // set the new image name
      if (opt_ppath.empty()) {
        s.str("");
        s << "image." << std::setw(4) << std::setfill('0') << iter << ".pgm";
        filename = vpIoTools::createFilePath(dirname, s.str());
      } else {
        sprintf(cfilename, opt_ppath.c_str(), iter);
        filename = cfilename;
      }
      // read the image
      std::cout << "read : " << filename << std::endl;
      vpImageIo::read(I, filename);

      if (opt_display) {
        // Display the image
        vpDisplay::display(I);
      }
      std::cout << "Tracking on image: " << filename << std::endl;

      // track the dot
      double time = vpTime::measureTimeMs();
      d.track(I);

      std::cout << "COG (" << vpTime::measureTimeMs() - time << " ms): " << std::endl;
      cog = d.getCog();
      std::cout << cog.get_u() << " " << cog.get_v() << std::endl;
      std::cout << "Size:" << std::endl;
      std::cout << "  w: " << d.getWidth() << " h: " << d.getHeight() << std::endl;
      std::cout << "Area: " << d.getArea() << std::endl;
      std::cout << "Centered normalized moments nij:" << std::endl;
      std::cout << "  n20: " << d.get_nij()[0] << std::endl;
      std::cout << "  n11: " << d.get_nij()[1] << std::endl;
      std::cout << "  n02: " << d.get_nij()[2] << std::endl;

      if (0) {
        std::list<vpImagePoint> edges = d.getEdges();
        std::list<vpImagePoint>::const_iterator it;
        for (it = edges.begin(); it != edges.end(); ++it) {
          vpDisplay::displayPoint(I, *it, vpColor::blue);
        }
      }

      if (opt_display) {
        // display a red cross (size 10) in the image at the dot center
        // of gravity location
        vpDisplay::displayCross(I, cog, 10, vpColor::red);
        // flush the X11 buffer
        vpDisplay::flush(I);
      }
      iter++;
    }

    if (opt_display && opt_click_allowed) {
      std::cout << "\nA click to exit..." << std::endl;
      // Wait for a blocking mouse click
      vpDisplay::getClick(I);
    }
    return EXIT_SUCCESS;
  } catch (const vpException &e) {
    std::cout << "Catch an exception: " << e << std::endl;
    return EXIT_FAILURE;
  }
}
#else
#include <iostream>

int main()
{
  std::cout << "visp_blob module or X11, GTK, GDI or OpenCV display "
               "functionalities are required..."
            << std::endl;
  return EXIT_SUCCESS;
}

#endif