fernClassifier.cpp

Detection of points of interests and matching using a Fern classifier.

/****************************************************************************
 *
 * $Id: fernClassifier.cpp 4658 2014-02-09 09:50:14Z fspindle $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2014 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
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.GPL 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://www.irisa.fr/lagadic/visp/visp.html for more information.
 * 
 * This software was developed at:
 * INRIA Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 * http://www.irisa.fr/lagadic
 *
 * 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:
 * Detection of points of interests and matching using the Ferns classifier.
 *
 * Authors:
 * Romain Tallonneau
 *
 *****************************************************************************/
#include <visp/vpConfig.h>
#include <visp/vpDebug.h>

#if ((defined (VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI)) && (VISP_HAVE_OPENCV_VERSION >= 0x020000))

#include <iostream>
#include <stdlib.h>
#include <visp/vpFernClassifier.h>
#include <visp/vpParseArgv.h>
#include <visp/vpConfig.h>
#include <visp/vpOpenCVGrabber.h>
#include <visp/vpImage.h>
#include <visp/vpDisplayX.h>
#include <visp/vpDisplayGTK.h>
#include <visp/vpDisplayGDI.h>
#include <visp/vpHomography.h>
#include <visp/vpImageIo.h>
#include <visp/vpIoTools.h>
#include <visp/vpTime.h>
#include <iomanip>

#define GETOPTARGS  "hlcdb:i:sp"

void usage(const char *name, const char *badparam);
bool getOptions(int argc, const char **argv, bool &isLearning, std::string& dataFile, bool& click_allowed,
                bool& display, bool& displayPoints, bool& useSequence, std::string& ipath);

void usage(const char *name, const char *badparam)
{
  fprintf(stdout, "\n\
Detection of points of interests and matching using the Ferns classifier. The \
object needs first to be learned (-l option). This learning process will create\
a file used to detect the object.\n\
\n\
SYNOPSIS\n\
  %s [-l] [-h] [-b] [-c] [-d] [-p] [-i] [-s]\n", name);

  fprintf(stdout, "\n\
OPTIONS:                                               \n\
  -l\n\
     learn an object.\n\
\n\
  -i <input image path>                                \n\
     Set image input path.\n\
     From this path read \"ViSP-images/line/image.%%04d.pgm\"\n\
     images. \n\
     Setting the VISP_INPUT_IMAGE_PATH environment\n\
     variable produces the same behaviour than using\n\
     this option.\n\
\n\
  -b\n\
     database filename to use (default is ./dataFern).\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\
  -s \n\
     Turn off the use of the sequence and use a webcam.\n\
\n\
  -p \n\
     display points of interest.\n\
\n\
  -h\n\
     Print this help.\n");

  if (badparam)
    fprintf(stdout, "\nERROR: Bad parameter [%s]\n", badparam);

}

bool getOptions(int argc, const char **argv, bool &isLearning, std::string& dataFile, bool& click_allowed,
                bool& display, bool& displayPoints, bool& useSequence, std::string& ipath)
{
  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 'l': isLearning = true; break;
    case 'h': usage(argv[0], NULL); return false; break;
    case 'b': dataFile = optarg_; break;
    case 'p': displayPoints = true; break;
    case 's': useSequence = false; break;
    case 'i': ipath = optarg_; break;
    default:
      usage(argv[0], optarg_);
      return false; break;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], NULL);
    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 {
    bool isLearning = false;
    std::string dataFile("./dataFern");
    bool opt_click_allowed = true;
    bool opt_display = true;
    std::string objectName("object");
    bool displayPoints = false;
    bool useSequence = true;
    std::string opt_ipath;
    std::string ipath;
    std::string env_ipath;
    std::string dirname;
    std::string filename;

    // Get the VISP_IMAGE_PATH environment variable value
    char *ptenv = getenv("VISP_INPUT_IMAGE_PATH");
    if (ptenv != NULL){
      env_ipath = ptenv;
    }

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

    // Read the command line options
    if (getOptions(argc, argv,
                   isLearning, dataFile, opt_click_allowed, opt_display, displayPoints, useSequence, opt_ipath) == false) {
      exit (-1);
    }

    // Get the option values
    if (useSequence && !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 (useSequence && !opt_ipath.empty() && !env_ipath.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 (useSequence && opt_ipath.empty() && env_ipath.empty()){
      usage(argv[0], NULL);
      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 << std::endl;
      exit(-1);
    }


    // Declare two images, these are gray level images (unsigned char)
    vpImage <unsigned char> I;
    vpImage <unsigned char> Iref;


    // Set the path location of the image sequence
    dirname = ipath +  vpIoTools::path("/ViSP-images/cube/");

    // Build the name of the image file
    unsigned iter = 0; // Image number
    std::ostringstream s;
    s.setf(std::ios::right, std::ios::adjustfield);
    s << "image." << std::setw(4) << std::setfill('0') << iter << ".pgm";
    filename = dirname + s.str();

    // 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{
      if(useSequence){
        vpCTRACE << "Load: " << filename << std::endl;
        vpImageIo::read(Iref, filename) ;
        I = Iref;
      }
    }
    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);
    }


    // Declare a framegrabber
    vpOpenCVGrabber g;
    if(!useSequence){
      try{
        g.open(I);
      }
      catch(...){
        std::cout << "problem to initialise the framegrabber" << std::endl;
        exit(-1);
      }
      g.acquire(I);
      // initialise the reference image
      g.acquire(Iref);
    }

#if defined VISP_HAVE_X11
    vpDisplayX display;
#elif defined VISP_HAVE_GTK
    vpDisplayGTK display;
#elif defined VISP_HAVE_GDI
    vpDisplayGDI display;
#endif

#if defined VISP_HAVE_X11
    vpDisplayX displayRef;
#elif defined VISP_HAVE_GTK
    vpDisplayGTK displayRef;
#elif defined VISP_HAVE_GDI
    vpDisplayGDI displayRef;
#endif

    // declare a planar object detector
    vpFernClassifier fern;

    if(isLearning){
      if(opt_display){
        displayRef.init(Iref, 100, 100, "Reference image") ;
        vpDisplay::display(Iref);
        vpDisplay::flush(Iref);
      }
      vpImagePoint corners[2];
      if (opt_display && opt_click_allowed){
        std::cout << "Click on the top left and the bottom right corners to define the reference plane" << std::endl;
        for (int i=0 ; i < 2 ; i++){
          vpDisplay::getClick(Iref, corners[i]);
          std::cout << corners[i] << std::endl;
        }
      }
      else{
        corners[0].set_ij(1,1);
        corners[1].set_ij(I.getHeight()-2,I.getWidth()-2);
      }

      if (opt_display) {
        //Display the rectangle which defines the part of the image where the reference points are computed.
        vpDisplay::displayRectangle(Iref, corners[0], corners[1], vpColor::green);
        vpDisplay::flush(Iref);
      }

      if (opt_click_allowed){
        std::cout << "Click on the image to continue" << std::endl;
        vpDisplay::getClick(Iref);
      }

      vpRect roi(corners[0], corners[1]);

      std::cout << "> train the classifier on the selected plane. (may take up to several minutes)." << std::endl;
      if(opt_display) {
        vpDisplay::display(Iref);
        vpDisplay::flush(Iref);
      }

      try{
        fern.buildReference(Iref, roi);
      }
      catch(vpException e){
        std::cout << e.getMessage() << std::endl;
      }
      catch(...){
        std::cout << "unknown error, line " << __LINE__ << std::endl;
      }
      try{
        fern.record(objectName, dataFile);
      }
      catch(vpException e){
        std::cout << e.getMessage() << std::endl;
      }
      catch(...){
        std::cout << "unknown error, line " << __LINE__ << std::endl;
      }
      std::cout << __LINE__ << std::endl;
    }
    else{
      if(!vpIoTools::checkFilename(dataFile)){
        vpERROR_TRACE("cannot load the database with the specified name. Has the object been learned with the -l option? ");
        exit(-1);
      }
      try{
        // load a previously recorded file
        fern.load(dataFile, objectName);
      }
      catch(...){
        vpERROR_TRACE("cannot load the database with the specified name. Has the object been learned with the -l option? ");
        exit(-1);
      }
    }


    if(opt_display){
      display.init(I, 110 + (int)Iref.getWidth(), 100, "Current image") ;
      vpDisplay::display(I);
      vpDisplay::flush(I);
    }

    if (opt_display && opt_click_allowed){
      std::cout << "Click on the current image to continue" << std::endl;
      vpDisplay::displayCharString (I, vpImagePoint(15,15),
                                    (char*)"Click on the current image to continue", vpColor::red);
      vpDisplay::flush(I);
      vpDisplay::getClick(I);
    }

    for ( ; ; ) {
      // acquire a new image
      if(useSequence){
        iter++;
        if(iter >= 80){
          break;
        }
        s.str("");
        s << "image." << std::setw(4) << std::setfill('0') << iter << ".pgm";
        filename = dirname + s.str();
        // read the image
        vpImageIo::read(I, filename);
      }
      else{
        g.acquire(I);
      }

      if(opt_display){
        vpDisplay::display(I);
        if(isLearning)
          vpDisplay::display(Iref);
      }

      double t0 = vpTime::measureTimeMs ();
      // detection  of the reference image
      unsigned int nbpts;
      try{
        nbpts = fern.matchPoint(I);
      }
      catch(vpException e){
        std::cout << e.getMessage() << std::endl;
        return -1;
      }
      catch(...){
        std::cout << "unknown error line " << __LINE__ << std::endl;
        return -1;
      }
      std::cout << "matching " << nbpts << " points : " << vpTime::measureTimeMs () - t0 << " ms" << std::endl;

      if(opt_display){
        fern.display(Iref, I, 7);
        vpDisplay::flush(I);
        if(isLearning)
          vpDisplay::flush(Iref);
        if(vpDisplay::getClick(I, false)){
          break;
        }
      }
    }

    return 0;
  }
  catch(vpException e) {
    std::cout << "Catch an exception: " << e << std::endl;
    return 1;
  }
}

#else
int
main()
{
#if ( ! (defined (VISP_HAVE_X11) || defined(VISP_HAVE_GTK) || defined(VISP_HAVE_GDI)) ) 
  vpERROR_TRACE("You do not have X11, GTK or GDI display functionalities...");
#else
  vpERROR_TRACE("You do not have OpenCV-2.0.0 or a more recent release...");
#endif
}

#endif