vpMbEdgeKltTracker.cpp

/****************************************************************************
 *
 * $Id: vpMbEdgeKltTracker.cpp 4327 2013-07-19 14:08:01Z fspindle $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2013 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.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://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:
 * Hybrid tracker based on edges (vpMbt) and points of interests (KLT)
 *
 * Authors:
 * Romain Tallonneau
 * Aurelien Yol
 *
 *****************************************************************************/

#include <visp/vpMbEdgeKltTracker.h>

#ifdef VISP_HAVE_OPENCV

vpMbEdgeKltTracker::vpMbEdgeKltTracker()
{
  compute_interaction = true;
  computeCovariance = false;
  
  lambda = 0.8;
  thresholdKLT = 2.0;
  thresholdMBT = 2.0;
  maxIter = 200;
  vpMbKltTracker::setMaxIter(30);
  
#ifdef VISP_HAVE_OGRE
  vpMbKltTracker::faces.getOgreContext()->setWindowName("MBT Hybrid");
#endif
}

vpMbEdgeKltTracker::~vpMbEdgeKltTracker()
{
}

void 
vpMbEdgeKltTracker::init(const vpImage<unsigned char>& I)
{
  vpMbKltTracker::init(I);
  
  initPyramid(I, Ipyramid);
  
  unsigned int n = 0;
  for(unsigned int i = 0; i < vpMbKltTracker::faces.size() ; i++){
      if(vpMbKltTracker::faces[i]->isVisible()){
        vpMbEdgeTracker::faces[i]->isvisible = true;
        n++;
      }
      else
        vpMbEdgeTracker::faces[i]->isvisible = false;
  }
  vpMbEdgeTracker::nbvisiblepolygone = n;
  
  unsigned int i = (unsigned int)scales.size();
  do {
    i--;
    if(scales[i]){
      downScale(i);
      initMovingEdge(*Ipyramid[i], cMo);
      upScale(i);
    }
  } while(i != 0);
  
  cleanPyramid(Ipyramid);
}

void           
vpMbEdgeKltTracker::setPose( const vpImage<unsigned char> &I, const vpHomogeneousMatrix& cdMo)
{
  if(firstTrack){
    vpMbKltTracker::setPose(I, cdMo);
    
    vpMbtDistanceLine *l;
    lines[scaleLevel].front() ;
    for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[scaleLevel].begin(); it!=lines[scaleLevel].end(); ++it){
      l = *it;
      if(l->meline != NULL){
        delete l->meline;
        l->meline = NULL;
      }
    }
    
    initPyramid(I, Ipyramid);
    
    unsigned int n = 0;
    for(unsigned int i = 0; i < vpMbKltTracker::faces.size() ; i++){
        if(vpMbKltTracker::faces[i]->isVisible()){
          vpMbEdgeTracker::faces[i]->isvisible = true;
          n++;
        }
        else
          vpMbEdgeTracker::faces[i]->isvisible = false;
    }
    vpMbEdgeTracker::nbvisiblepolygone = n;
    
    unsigned int i = (unsigned int)scales.size();
    do {
      i--;
      if(scales[i]){
        downScale(i);
        initMovingEdge(*Ipyramid[i], cMo);
        upScale(i);
      }
    } while(i != 0);
    
    cleanPyramid(Ipyramid);
  }
}

void    
vpMbEdgeKltTracker::resetTracker()
{
  vpMbEdgeTracker::resetTracker();
  vpMbKltTracker::resetTracker();
}

unsigned int
vpMbEdgeKltTracker::initMbtTracking(const unsigned int lvl)
{
  vpMbtDistanceLine *l ;
  vpMbtDistanceCylinder *cy ;

  if(lvl  >= scales.size() || !scales[lvl]){
    throw vpException(vpException::dimensionError, "lvl not used.");
  }

  unsigned int nbrow  = 0;
  for(std::list<vpMbtDistanceLine*>::iterator it=lines[lvl].begin(); it!=lines[lvl].end(); ++it){
    l = *it;
    nbrow += l->nbFeature ;
    l->initInteractionMatrixError() ;
  }
  
  for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[lvl].begin(); it!=cylinders[lvl].end(); ++it){
    cy = *it;
    nbrow += cy->nbFeature ;
    cy->initInteractionMatrixError() ;
  }
  
  return nbrow;  
}

void 
vpMbEdgeKltTracker::loadConfigFile(const std::string& configFile)
{
  vpMbEdgeKltTracker::loadConfigFile(configFile.c_str());
}

void
vpMbEdgeKltTracker::loadConfigFile(const char* configFile)
{
#ifdef VISP_HAVE_XML2
  vpMbEdgeTracker::loadConfigFile(configFile);
  vpMbKltTracker::loadConfigFile(configFile);
#else
  vpTRACE("You need the libXML2 to read the config file %s", configFile);
#endif
}

void
vpMbEdgeKltTracker::loadModel(const std::string& modelFile)
{
  vpMbTracker::loadModel(modelFile);
}

bool
vpMbEdgeKltTracker::postTracking(const vpImage<unsigned char>& I, vpColVector &w_mbt, vpColVector &w_klt,
                                 const unsigned int lvl)
{
  bool reInit = vpMbKltTracker::postTracking(I, w_klt);
  
  postTrackingMbt(w_mbt,lvl);
  
  if (displayFeatures)
  {
    if(lvl == 0){
      vpMbtDistanceLine* l;
      for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[lvl].begin(); it!=lines[lvl].end(); ++it){
        l = *it;
        if (l->isVisible()){
          l->displayMovingEdges(I);
        }
      }
      
      vpMbtDistanceCylinder *cy ;
      for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[lvl].begin(); it!=cylinders[lvl].end(); ++it){
        cy = *it;
        cy->displayMovingEdges(I);
      }
    }
  }
  
  if(reInit)
    return true;
  
  vpMbEdgeTracker::updateMovingEdge(I);
  unsigned int n = 0;
  for(unsigned int i = 0; i < vpMbKltTracker::faces.size() ; i++){
      if(vpMbKltTracker::faces[i]->isVisible()){
        vpMbEdgeTracker::faces[i]->isvisible = true;
        n++;
      }
      else
        vpMbEdgeTracker::faces[i]->isvisible = false;
  }
  vpMbEdgeTracker::nbvisiblepolygone = n;
  
  vpMbEdgeTracker::initMovingEdge(I, cMo) ;
  vpMbEdgeTracker::reinitMovingEdge(I, cMo);
  
  return false;
}

void
vpMbEdgeKltTracker::postTrackingMbt(vpColVector &w, const unsigned int lvl)
{

  if(lvl  >= scales.size() || !scales[lvl]){
    throw vpException(vpException::dimensionError, "_lvl not used.");
  }
  unsigned int n =0 ;
  vpMbtDistanceLine* l;
  for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[lvl].begin(); it!=lines[lvl].end(); ++it){
    l = *it;
    {
      double wmean = 0 ;
      std::list<vpMeSite>::iterator itListLine;
      if (l->nbFeature > 0) itListLine = l->meline->getMeList().begin();
      
      for (unsigned int i=0 ; i < l->nbFeature ; i++){
        wmean += w[n+i] ;
        vpMeSite p = *itListLine;
        if (w[n+i] < 0.5){
          p.setState(vpMeSite::M_ESTIMATOR);
          
          *itListLine = p;
        }

        ++itListLine;
      }
      n+= l->nbFeature ;
      
      if (l->nbFeature!=0)
        wmean /= l->nbFeature ;
      else
        wmean = 1;
            
      l->setMeanWeight(wmean);

      if (wmean < 0.8)
        l->Reinit = true;
    }
  }
  
  // Same thing with cylinders as with lines
  vpMbtDistanceCylinder *cy ;
  for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[lvl].begin(); it!=cylinders[lvl].end(); ++it){
    cy = *it;
    double wmean = 0 ;
    std::list<vpMeSite>::iterator itListCyl1;
    std::list<vpMeSite>::iterator itListCyl2;
    if (cy->nbFeature > 0){
      itListCyl1 = cy->meline1->getMeList().begin();
      itListCyl2 = cy->meline2->getMeList().begin();
    }

    wmean = 0;
    for(unsigned int i=0 ; i < cy->nbFeaturel1 ; i++){
      wmean += w[n+i] ;
      vpMeSite p = *itListCyl1;
      if (w[n+i] < 0.5){
        p.setState(vpMeSite::M_ESTIMATOR);
          
        *itListCyl1 = p;
      }

      ++itListCyl1;
    }

    if (cy->nbFeaturel1!=0)
      wmean /= cy->nbFeaturel1 ;
    else
      wmean = 1;

    cy->setMeanWeight1(wmean);

    if (wmean < 0.8){
      cy->Reinit = true;
    }

    wmean = 0;
    for(unsigned int i=cy->nbFeaturel1 ; i < cy->nbFeature ; i++){
      wmean += w[n+i] ;
      vpMeSite p = *itListCyl2;
      if (w[n+i] < 0.5){
        p.setState(vpMeSite::M_ESTIMATOR);
        
        *itListCyl2 = p;
      }

      ++itListCyl2;
    }

    if (cy->nbFeaturel2!=0)
      wmean /= cy->nbFeaturel2 ;
    else
      wmean = 1;

    cy->setMeanWeight2(wmean);

    if (wmean < 0.8){
      cy->Reinit = true;
    }

    n+= cy->nbFeature ;
  }
}

void
vpMbEdgeKltTracker::computeVVS(const vpImage<unsigned char>& I, const unsigned int &nbInfos, vpColVector &w_mbt, vpColVector &w_klt, const unsigned int lvl)
{
  vpColVector factor;
  unsigned int nbrow = trackFirstLoop(I, factor, lvl);
  
  if(nbrow < 4 && nbInfos < 4){
    vpERROR_TRACE("\n\t\t Error-> not enough data") ;
    throw vpTrackingException(vpTrackingException::notEnoughPointError, "\n\t\t Error-> not enough data");
  }
  else if(nbrow < 4)
    nbrow = 0;
  
  double residu = 0;
  double residu_1 = -1;
  unsigned int iter = 0;

  vpMatrix *J;
  vpMatrix J_mbt, J_klt;     // interaction matrix
  vpColVector *R;
  vpColVector R_mbt, R_klt;  // residu
  vpMatrix J_true;
  vpColVector R_true;
  vpColVector w_true;
  
  if(nbrow != 0){
    J_mbt.resize(nbrow,6);
    R_mbt.resize(nbrow);
  }
  
  if(nbInfos != 0){
    J_klt.resize(2*nbInfos,6);
    R_klt.resize(2*nbInfos);
  }
  
  vpColVector w;  // weight from MEstimator
  vpColVector v;  // "speed" for VVS
  vpRobust robust_mbt(0), robust_klt(0);
  vpHomography H;

  vpMatrix JTJ, JTR;
  
  double factorMBT = 1.0;
  double factorKLT = 1.0;
  
  //More efficient weight repartition for hybrid tracker should come soon...
//   factorMBT = 1.0 - (double)nbrow / (double)(nbrow + nbInfos);
//   factorKLT = 1.0 - factorMBT;
  factorMBT = 0.35;
  factorKLT = 0.65;
  
  double residuMBT = 0;
  double residuKLT = 0;
  
  while( ((int)((residu - residu_1)*1e8) !=0 )  && (iter<maxIter) ){   
    J = new vpMatrix(); 
    R = new vpColVector();
    
    if(nbrow >= 4)
      trackSecondLoop(I,J_mbt,R_mbt,cMo,lvl);
      
    if(nbInfos >= 4){
      unsigned int shift = 0;
      for (unsigned int i = 0; i < vpMbKltTracker::faces.size(); i += 1){
        if(vpMbKltTracker::faces[i]->isVisible() && vpMbKltTracker::faces[i]->hasEnoughPoints()){
          vpSubColVector subR(R_klt, shift, 2*vpMbKltTracker::faces[i]->getNbPointsCur());
          vpSubMatrix subJ(J_klt, shift, 0, 2*vpMbKltTracker::faces[i]->getNbPointsCur(), 6);
          vpMbKltTracker::faces[i]->computeHomography(ctTc0, H);
          vpMbKltTracker::faces[i]->computeInteractionMatrixAndResidu(subR, subJ);
          shift += 2*vpMbKltTracker::faces[i]->getNbPointsCur();
        }
      }
    }
    
    if(iter == 0){
      w.resize(nbrow + 2*nbInfos);
      w=1;
      
      w_mbt.resize(nbrow);
      w_mbt = 1;
      robust_mbt.resize(nbrow);
      
      w_klt.resize(2*nbInfos);
      w_klt = 1;
      robust_klt.resize(2*nbInfos);
      
      w_true.resize(nbrow + 2*nbInfos);
    }

      /* robust */   
    if(nbrow > 3){
      residuMBT = 0;
      for(unsigned int i = 0; i < R_mbt.getRows(); i++)
        residuMBT += fabs(R_mbt[i]);
      residuMBT /= R_mbt.getRows();
      
      robust_mbt.setIteration(iter);
      robust_mbt.setThreshold(thresholdMBT/cam.get_px());
      robust_mbt.MEstimator( vpRobust::TUKEY, R_mbt, w_mbt);
      J->stackMatrices(J_mbt);
      R->stackMatrices(R_mbt);
    }
    
    if(nbInfos > 3){
      residuKLT = 0;
      for(unsigned int i = 0; i < R_klt.getRows(); i++)
        residuKLT += fabs(R_klt[i]);
      residuKLT /= R_klt.getRows();
      
      robust_klt.setIteration(iter);
      robust_klt.setThreshold(thresholdKLT/cam.get_px());
      robust_klt.MEstimator( vpRobust::TUKEY, R_klt, w_klt);
      
      J->stackMatrices(J_klt);
      R->stackMatrices(R_klt);
    }

    unsigned int cpt = 0;
    while(cpt< (nbrow+2*nbInfos)){
      if(cpt<(unsigned)nbrow){
        w[cpt] = ((w_mbt[cpt] * factor[cpt]) * factorMBT) ;
      }
      else
        w[cpt] = (w_klt[cpt-nbrow] * factorKLT);
      cpt++;
    }
    
    if(computeCovariance){
      R_true = (*R);
      J_true = (*J);
    }

    residu_1 = residu;
    residu = 0;    
    double num = 0;
    double den = 0;
    for (unsigned int i = 0; i < static_cast<unsigned int>(R->getRows()); i++){
      num += w[i]*vpMath::sqr((*R)[i]);
      den += w[i];
      
      w_true[i] = w[i]*w[i];
      (*R)[i] *= w[i];
      if(compute_interaction){
        for (unsigned int j = 0; j < 6; j += 1){
          (*J)[i][j] *= w[i];
        }
      }
    }

    residu = sqrt(num/den);

    JTJ = J->AtA();
    computeJTR(*J, *R, JTR);
    v = -lambda * JTJ.pseudoInverse() * JTR;
    cMo = vpExponentialMap::direct(v).inverse() * cMo;
    ctTc0 = vpExponentialMap::direct(v).inverse() * ctTc0;
    
    iter++;
    
    delete J;
    delete R;
  }
  
  if(computeCovariance){
    vpMatrix D;
    D.diag(w_true);
    covarianceMatrix = vpMatrix::computeCovarianceMatrix(J_true,v,-lambda*R_true,D);
  }
}

void
vpMbEdgeKltTracker::track(const vpImage<unsigned char>& I)
{ 
  unsigned int nbInfos;
  unsigned int nbFaceUsed;
  vpColVector w_klt;
  
  vpMbKltTracker::preTracking(I, nbInfos, nbFaceUsed);
  
  if(nbInfos >= 4)
    vpMbKltTracker::computeVVS(nbInfos, w_klt);
  else{
    nbInfos = 0;
    // std::cout << "[Warning] Unable to init with KLT" << std::endl;
  }
  
  vpMbEdgeTracker::trackMovingEdge(I);
 
  vpColVector w_mbt;
  computeVVS(I, nbInfos, w_mbt, w_klt);
  
  if(postTracking(I, w_mbt, w_klt)){
    vpMbKltTracker::reinit(I);
    
    initPyramid(I, Ipyramid);
  
    unsigned int n = 0;
    for(unsigned int i = 0; i < vpMbKltTracker::faces.size() ; i++){
        if(vpMbKltTracker::faces[i]->isVisible()){
          vpMbEdgeTracker::faces[i]->isvisible = true;
          n++;
        }
        else
          vpMbEdgeTracker::faces[i]->isvisible = false;
    }
    vpMbEdgeTracker::nbvisiblepolygone = n;
    
    unsigned int i = (unsigned int)scales.size();
    do {
      i--;
      if(scales[i]){
        downScale(i);
        initMovingEdge(*Ipyramid[i], cMo);
        upScale(i);
      }
    } while(i != 0);
    
    cleanPyramid(Ipyramid);
  }
}

unsigned int
vpMbEdgeKltTracker::trackFirstLoop(const vpImage<unsigned char>& I, vpColVector &factor, const unsigned int lvl)
{
  vpMbtDistanceLine *l ;
  vpMbtDistanceCylinder *cy ;

  if(lvl  >= scales.size() || !scales[lvl]){
    throw vpException(vpException::dimensionError, "_lvl not used.");
  }

  unsigned int nbrow  = initMbtTracking(lvl);
  
  if (nbrow==0){
//     vpERROR_TRACE("\n\t\t Error-> not enough data in the interaction matrix...") ;
//     throw vpTrackingException(vpTrackingException::notEnoughPointError, "\n\t\t Error-> not enough data in the interaction matrix...");
      return nbrow;
  }
  
  factor.resize(nbrow);
  factor = 1;
    
  unsigned int n = 0;
  for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[lvl].begin(); it!=lines[lvl].end(); ++it){
    l = *it;
    l->computeInteractionMatrixError(cMo);
    
    double fac = 1;
    for(std::list<int>::const_iterator it = l->Lindex_polygon.begin(); it!=l->Lindex_polygon.end(); ++it){
      int index = *it;
      if (l->hiddenface->isAppearing((unsigned int)index)) {
        fac = 0.2;
        break;
      }
      if(l->closeToImageBorder(I, 10)){
        fac = 0.1;
        break;
      }
    }
    
    std::list<vpMeSite>::const_iterator itListLine;
    if (l->meline != NULL)
      itListLine = l->meline->getMeList().begin();
    
    for (unsigned int i=0 ; i < l->nbFeature ; i++){
        factor[n+i] = fac;
        vpMeSite site = *itListLine;
        if (site.getState() != vpMeSite::NO_SUPPRESSION) factor[n+i] = 0.2;
        ++itListLine;
    }   
    n+= l->nbFeature ;
  }
  
  for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[lvl].begin(); it!=cylinders[lvl].end(); ++it){
    cy = *it;
    cy->computeInteractionMatrixError(cMo, I);
    double fac = 1.0;

    std::list<vpMeSite>::const_iterator itCyl1;
    std::list<vpMeSite>::const_iterator itCyl2;
    if ((cy->meline1 != NULL || cy->meline2 != NULL)){
      itCyl1 = cy->meline1->getMeList().begin();
      itCyl2 = cy->meline2->getMeList().begin();
    }

    for(unsigned int i=0 ; i < cy->nbFeature ; i++){
      factor[n+i] = fac;
      vpMeSite site;
      if(i<cy->nbFeaturel1) {
        site= *itCyl1;
        ++itCyl1;
      }
      else{
        site= *itCyl2;
        ++itCyl2;
      }
      if (site.getState() != vpMeSite::NO_SUPPRESSION) factor[n+i] = 0.2;
    }

    n+= cy->nbFeature ;
  }
  
  return nbrow;
}

void 
vpMbEdgeKltTracker::trackSecondLoop(const vpImage<unsigned char>& I,  vpMatrix &L, vpColVector &error,
                                    vpHomogeneousMatrix& cMo, const unsigned int lvl)
{
  vpMbtDistanceLine* l;
  vpMbtDistanceCylinder *cy ;
  
  unsigned int n = 0 ;
  for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[lvl].begin(); it!=lines[lvl].end(); ++it){
    l = *it;
    l->computeInteractionMatrixError(cMo) ;
    for (unsigned int i=0 ; i < l->nbFeature ; i++){
      for (unsigned int j=0; j < 6 ; j++){
        L[n+i][j] = l->L[i][j];
        error[n+i] = l->error[i];
      }
    }
    n+= l->nbFeature;
  }
  
  for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[lvl].begin(); it!=cylinders[lvl].end(); ++it){
    cy = *it;
    cy->computeInteractionMatrixError(cMo, I) ;
    for(unsigned int i=0 ; i < cy->nbFeature ; i++){
      for(unsigned int j=0; j < 6 ; j++){
        L[n+i][j] = cy->L[i][j];
        error[n+i] = cy->error[i];
      }
    }

    n+= cy->nbFeature ;
  }
}

void
vpMbEdgeKltTracker::setCameraParameters(const vpCameraParameters& cam)
{
  this->cam = cam;
  
  vpMbEdgeTracker::setCameraParameters(cam);
  vpMbKltTracker::setCameraParameters(cam);
}

void
vpMbEdgeKltTracker::initFaceFromCorners(const std::vector<vpPoint>& corners, const unsigned int indexFace)
{
  vpMbEdgeTracker::initFaceFromCorners(corners, indexFace);
  vpMbKltTracker::initFaceFromCorners(corners, indexFace);
}

void    
vpMbEdgeKltTracker::initCylinder(const vpPoint& _p1, const vpPoint _p2, const double _radius, const unsigned int _indexCylinder)
{
  vpMbEdgeTracker::initCylinder(_p1, _p2, _radius, _indexCylinder);
}

void
vpMbEdgeKltTracker::display(const vpImage<unsigned char>& I, const vpHomogeneousMatrix &cMo, const vpCameraParameters & cam,
                            const vpColor& col , const unsigned int thickness, const bool displayFullModel)
{  
  vpMbtDistanceLine *l ;
  
  for (unsigned int i = 0; i < scales.size(); i += 1){
    if(scales[i]){
      for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[scaleLevel].begin(); it!=lines[scaleLevel].end(); ++it){
        l = *it;
        l->display(I,cMo, cam, col, thickness, displayFullModel);
      }

      for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[scaleLevel].begin(); it!=cylinders[scaleLevel].end(); ++it){
        (*it)->display(I, cMo, cam, col, thickness);
      }

      break ; //displaying model on one scale only
    }
  }
  
  for (unsigned int i = 0; i < vpMbKltTracker::faces.size(); i += 1){
    if(displayFeatures && vpMbKltTracker::faces[i]->hasEnoughPoints() && vpMbKltTracker::faces[i]->isVisible()) {
        vpMbKltTracker::faces[i]->displayPrimitive(I);
    }
  }
  
#ifdef VISP_HAVE_OGRE
  if(vpMbKltTracker::useOgre)
    vpMbKltTracker::faces.displayOgre(cMo);
#endif
}

void
vpMbEdgeKltTracker::display(const vpImage<vpRGBa>& I, const vpHomogeneousMatrix &cMo, const vpCameraParameters & cam,
                            const vpColor& col , const unsigned int thickness, const bool displayFullModel)
{ 
  vpMbtDistanceLine *l ;
  
  for (unsigned int i = 0; i < scales.size(); i += 1){
    if(scales[i]){
      for(std::list<vpMbtDistanceLine*>::const_iterator it=lines[scaleLevel].begin(); it!=lines[scaleLevel].end(); ++it){
        l = *it;
        l->display(I,cMo, cam, col, thickness, displayFullModel);
      }

      for(std::list<vpMbtDistanceCylinder*>::const_iterator it=cylinders[scaleLevel].begin(); it!=cylinders[scaleLevel].end(); ++it){
        (*it)->display(I, cMo, cam, col, thickness);
      }

      break ; //displaying model on one scale only
    }
  }
  
  for (unsigned int i = 0; i < vpMbKltTracker::faces.size(); i += 1){
    if(displayFeatures && vpMbKltTracker::faces[i]->hasEnoughPoints() && vpMbKltTracker::faces[i]->isVisible()) {
        vpMbKltTracker::faces[i]->displayPrimitive(I);
    }
  }
  
#ifdef VISP_HAVE_OGRE
  if(vpMbKltTracker::useOgre)
    vpMbKltTracker::faces.displayOgre(cMo);
#endif
}

#endif //VISP_HAVE_OPENCV