vpFeatureVanishingPoint.cpp

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 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://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:
 * 2D vanishing point visual feature (Z coordinate in 3D space is infinity)
 *
 * Authors:
 * Odile Bourquardez
 *
 *****************************************************************************/


#include <visp3/visual_features/vpBasicFeature.h>
#include <visp3/visual_features/vpFeatureVanishingPoint.h>

// Exception
#include <visp3/core/vpException.h>
#include <visp3/visual_features/vpFeatureException.h>

// Debug trace
#include <visp3/core/vpDebug.h>

// math
#include <visp3/core/vpMath.h>

#include <visp3/core/vpFeatureDisplay.h>

void
vpFeatureVanishingPoint::init()
{
    //feature dimension
    dim_s = 2 ;
    nbParameters = 2;

    // memory allocation
    s.resize(dim_s) ;
    if (flags == NULL)
      flags = new bool[nbParameters];
    for (unsigned int i = 0; i < nbParameters; i++) flags[i] = false;

    //Z not required  (infinity)
    //set_Z(1) ;

}
vpFeatureVanishingPoint::vpFeatureVanishingPoint()
{
    init() ;
}


void
vpFeatureVanishingPoint::set_x(const double _x)
{
    s[0] = _x ;
    flags[0] = true;
}
double
vpFeatureVanishingPoint::get_x() const
{
    return s[0] ;
}

void
vpFeatureVanishingPoint::set_y(const double _y)
{
    s[1] = _y ;
    flags[1] = true;
}
double
vpFeatureVanishingPoint::get_y() const
{
    return s[1] ;
}


void
vpFeatureVanishingPoint::set_xy(const double _x,
            const double _y)
{
  set_x(_x) ;
  set_y(_y) ;
}


vpMatrix
vpFeatureVanishingPoint::interaction(const unsigned int select)
{
  vpMatrix L ;

  L.resize(0,6) ;

  if (deallocate == vpBasicFeature::user)
  {
    for (unsigned int i = 0; i < nbParameters; i++)
    {
      if (flags[i] == false)
      {
        switch(i){
        case 0:
          vpTRACE("Warning !!!  The interaction matrix is computed but x was not set yet");
        break;
        case 1:
          vpTRACE("Warning !!!  The interaction matrix is computed but y was not set yet");
        break;
        default:
          vpTRACE("Problem during the reading of the variable flags");
        }
      }
    }
    resetFlags();
  }

  double x = get_x() ;
  double y = get_y() ;

  if (vpFeatureVanishingPoint::selectX() & select )
  {
    vpMatrix Lx(1,6) ; Lx = 0;

    Lx[0][0] = 0.  ;
    Lx[0][1] = 0. ;
    Lx[0][2] = 0. ;
    Lx[0][3] = x*y ;
    Lx[0][4] = -(1+x*x) ;
    Lx[0][5] = y ;

    L = vpMatrix::stack(L,Lx) ;
  }

  if (vpFeatureVanishingPoint::selectY() & select )
  {
    vpMatrix Ly(1,6) ; Ly = 0;

    Ly[0][0] = 0 ;
    Ly[0][1] = 0. ;
    Ly[0][2] = 0. ;
    Ly[0][3] = 1+y*y ;
    Ly[0][4] = -x*y ;
    Ly[0][5] = -x ;

    L = vpMatrix::stack(L,Ly) ;
  }
  return L ;
}


vpColVector
vpFeatureVanishingPoint::error(const vpBasicFeature &s_star,
                   const unsigned int select)
{
  vpColVector e(0) ;

  try{
    if (vpFeatureVanishingPoint::selectX() & select )
    {
      vpColVector ex(1) ;
      ex[0] = s[0] - s_star[0] ;

      e = vpColVector::stack(e,ex) ;
    }

    if (vpFeatureVanishingPoint::selectY() & select )
    {
      vpColVector ey(1) ;
      ey[0] = s[1] - s_star[1] ;
      e =  vpColVector::stack(e,ey) ;
    }
  }
  catch(...) {
    throw ;
  }
  return e ;
}



void
vpFeatureVanishingPoint::print(const unsigned int select ) const
{

  std::cout <<"Point: " <<std::endl;
  if (vpFeatureVanishingPoint::selectX() & select )
    std::cout << " x=" << get_x() ;
  if (vpFeatureVanishingPoint::selectY() & select )
    std::cout << " y=" << get_y() ;
  std::cout <<std::endl ;
}


void
vpFeatureVanishingPoint::buildFrom(const double _x, const double _y)
{
  s[0] = _x ;
  s[1] = _y ;
  for(unsigned int i = 0; i < nbParameters; i++) flags[i] = true;
}


void
vpFeatureVanishingPoint::display(const vpCameraParameters &cam,
                                 const vpImage<unsigned char> &I,
                                 const vpColor &color,
                                 unsigned int thickness) const
{
  try{
    double x,y ;
    x = get_x() ;
    y = get_y() ;

    vpFeatureDisplay::displayPoint(x, y, cam, I, color, thickness) ;

  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}
void
vpFeatureVanishingPoint::display(const vpCameraParameters &cam,
                                 const vpImage<vpRGBa> &I,
                                 const vpColor &color,
                                 unsigned int thickness) const
{
  try{
    double x,y ;
    x = get_x() ;
    y = get_y() ;

    vpFeatureDisplay::displayPoint(x, y, cam, I, color, thickness) ;

  }
  catch(...)
  {
    vpERROR_TRACE("Error caught") ;
    throw ;
  }
}


vpFeatureVanishingPoint *vpFeatureVanishingPoint::duplicate() const
{
  vpFeatureVanishingPoint *feature = new vpFeatureVanishingPoint ;
  return feature ;
}

unsigned int vpFeatureVanishingPoint::selectX()  { return FEATURE_LINE[0] ; }
unsigned int vpFeatureVanishingPoint::selectY()  { return FEATURE_LINE[1] ; }