vpTemplateTrackerWarpHomography.cpp

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2015 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:
 * Template tracker.
 *
 * Authors:
 * Amaury Dame
 * Aurelien Yol
 * Fabien Spindler
 *
 *****************************************************************************/
#include <visp3/tt/vpTemplateTrackerWarpHomography.h>
#include <visp3/core/vpTrackingException.h>

vpTemplateTrackerWarpHomography::vpTemplateTrackerWarpHomography()
{
  nbParam = 8 ;
  dW.resize(2,nbParam);
}

//get the parameter corresponding to the lower level of a gaussian pyramid
void vpTemplateTrackerWarpHomography::getParamPyramidDown(const vpColVector &p,vpColVector &pdown)
{
  pdown=p;
  pdown[2]=p[2]*2.;
  pdown[5]=p[5]*2.;
  pdown[6]=p[6]/2.;
  pdown[7]=p[7]/2.;
}

void vpTemplateTrackerWarpHomography::getParamPyramidUp(const vpColVector &p,vpColVector &pup)
{
  pup=p;
  pup[2]=p[2]/2.;
  pup[5]=p[5]/2.;
  pup[6]=p[6]*2.;
  pup[7]=p[7]*2.;
}

/*calcul de di*dw(x,p0)/dp  */
void vpTemplateTrackerWarpHomography::getdW0(const int &i,const int &j,const double &dy,const double &dx,double *dIdW)
{
  dIdW[0]=j*dx;
  dIdW[1]=j*dy;
  dIdW[2]=-j*j*dx-i*j*dy;
  dIdW[3]=i*dx;
  dIdW[4]=i*dy;
  dIdW[5]=-i*j*dx-i*i*dy;
  dIdW[6]=dx;
  dIdW[7]=dy;
}
/*calcul de dw(x,p0)/dp  */
void vpTemplateTrackerWarpHomography::getdWdp0(const int &i,const int &j,double *dIdW)
{ 
  dIdW[0]=j;
  dIdW[1]=0;
  dIdW[2]=-j*j;
  dIdW[3]=i;
  dIdW[4]=0;
  dIdW[5]=-i*j;
  dIdW[6]=1.;
  dIdW[7]=0;

  dIdW[8]=0;
  dIdW[9]=j;
  dIdW[10]=-i*j;
  dIdW[11]=0;
  dIdW[12]=i;
  dIdW[13]=-i*i;
  dIdW[14]=0;
  dIdW[15]=1.;
}
void vpTemplateTrackerWarpHomography::computeDenom(vpColVector &vX, const vpColVector &ParamM)
{
  denom=(1./(ParamM[2]*vX[0]+ParamM[5]*vX[1]+1.));
}

void vpTemplateTrackerWarpHomography::warpX(const int &i,const int &j,double &i2,double &j2,const vpColVector &ParamM)
{
  j2=((1.+ParamM[0])*j+ParamM[3]*i+ParamM[6])*denom;
  i2=(ParamM[1]*j+(1.+ParamM[4])*i+ParamM[7])*denom;
}


void vpTemplateTrackerWarpHomography::warpX(const vpColVector &vX,vpColVector &vXres,const vpColVector &ParamM)
{
  //if((ParamM[2]*vX[0]+ParamM[5]*vX[1]+1)>0)//si dans le plan image reel
  if((denom)>0)// FS optimisation
  {
    vXres[0]=((1+ParamM[0])*vX[0]+ParamM[3]*vX[1]+ParamM[6])*denom;
    vXres[1]=(ParamM[1]*vX[0]+(1+ParamM[4])*vX[1]+ParamM[7])*denom;
  }
  else
    throw(vpTrackingException(vpTrackingException::fatalError,"Division by zero in vpTemplateTrackerWarpHomography::warpX()"));
}

void vpTemplateTrackerWarpHomography::dWarp(const vpColVector &X1,const vpColVector &X2,const vpColVector &/*ParamM*/,vpMatrix &dW_)
{
  double j=X1[0];
  double i=X1[1];
  dW_=0;
  dW_[0][0]=j*denom;
  dW_[0][2]=-j*X2[0]*denom;
  dW_[0][3]=i*denom;
  dW_[0][5]=-i*X2[0]*denom;
  dW_[0][6]=denom;

  dW_[1][1]=j*denom;
  dW_[1][2]=-j*X2[1]*denom;
  dW_[1][4]=i*denom;
  dW_[1][5]=-i*X2[1]*denom;
  dW_[1][7]=denom;
}

/*compute dw=dw/dx*dw/dp  */
void vpTemplateTrackerWarpHomography::dWarpCompo(const vpColVector &/*X1*/,const vpColVector &X2,const vpColVector &ParamM,
                                                 const double *dwdp0,vpMatrix &dW_)
{
  double dwdx0,dwdx1;
  double dwdy0,dwdy1;

  dwdx0=((1.+ParamM[0])-X2[0]*ParamM[2])*denom;
  dwdx1=(ParamM[1]-X2[1]*ParamM[2])*denom;
  dwdy0=(ParamM[3]-X2[0]*ParamM[5])*denom;
  dwdy1=((1.+ParamM[4])-X2[1]*ParamM[5])*denom;
  for(unsigned int i=0;i<nbParam;i++)
  {
    dW_[0][i]=dwdx0*dwdp0[i]+dwdy0*dwdp0[i+nbParam];
    dW_[1][i]=dwdx1*dwdp0[i]+dwdy1*dwdp0[i+nbParam];
  }
}

void vpTemplateTrackerWarpHomography::warpXInv(const vpColVector &vX,vpColVector &vXres,const vpColVector &ParamM)
{

  if((ParamM[2]*vX[0]+ParamM[5]*vX[1]+1)<0)//si dans le plan image reel
  {
    vXres[0]=((1+ParamM[0])*vX[0]+ParamM[3]*vX[1]+ParamM[6])/(ParamM[2]*vX[0]+ParamM[5]*vX[1]+1);
    vXres[1]=(ParamM[1]*vX[0]+(1+ParamM[4])*vX[1]+ParamM[7])/(ParamM[2]*vX[0]+ParamM[5]*vX[1]+1);
  }
  else
    throw(vpTrackingException(vpTrackingException::fatalError,"Division by zero in vpTemplateTrackerWarpHomography::warpXSpecialInv()")) ;
} 
void vpTemplateTrackerWarpHomography::getParamInverse(const vpColVector &ParamM,vpColVector &ParamMinv) const
{
  vpHomography H    = getHomography(ParamM);
  vpHomography Hinv = H.inverse();
  getParam(Hinv, ParamMinv);
} 


vpHomography vpTemplateTrackerWarpHomography::getHomography(const vpColVector &ParamM) const
{
  vpHomography H;
  for(unsigned int i=0;i<3;i++)
    for(unsigned int j=0;j<3;j++)
    {
      if(i+3*j!=8)
      {
        H[i][j]=ParamM[i+3*j];
        if(i==j)H[i][j]++;
      }
      else
        H[i][j]=1.;
    }

  return H;
}
void vpTemplateTrackerWarpHomography::getParam(const vpHomography &H,vpColVector &par) const
{
  par=0;
  for(unsigned int i=0;i<3;i++)
    for(unsigned int j=0;j<3;j++)
    {
      if(i+3*j!=8)
      {
        par[i+3*j]=H[i][j]/H[2][2];
        if(i==j)par[i+3*j]--;
      }
    }
}



void vpTemplateTrackerWarpHomography::pRondp(const vpColVector &p1, const vpColVector &p2,vpColVector &pres) const
{
  vpHomography H1 = getHomography(p1);
  vpHomography H2 = getHomography(p2);
  vpHomography H  = H1*H2;
  getParam(H,pres);
}