vpImageTools.h

/****************************************************************************
 *
 * $Id: vpImageTools.h 3578 2012-03-01 09:59:24Z fspindle $
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2012 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:
 * Image tools.
 *
 * Authors:
 * Fabien Spindler
 *
 *****************************************************************************/


#ifndef vpImageTools_H
#define vpImageTools_H

#include <visp/vpImage.h>

#ifdef VISP_HAVE_PTHREAD
#  include <pthread.h>
#endif

#include <visp/vpImageException.h>
#include <visp/vpMath.h>
#include <visp/vpRect.h>
#include <visp/vpCameraParameters.h>

#include <fstream>
#include <iostream>
#include <math.h>
#include <string.h>

class VISP_EXPORT vpImageTools
{

public:
  template<class Type>
  static void createSubImage(const vpImage<Type> &I,
                 unsigned int i_sub, unsigned int j_sub,
                 unsigned int nrow_sub, unsigned int ncol_sub,
                 vpImage<Type> &S);

  template<class Type>
  static void createSubImage(const vpImage<Type> &I,
                 const vpRect &rect,
                 vpImage<Type> &S);
  template<class Type>
  static void binarise(vpImage<Type> &I,
               Type threshold1, Type threshold2,
               Type value1, Type value2, Type value3);
  static void changeLUT(vpImage<unsigned char>& I,
            unsigned char A,
            unsigned char newA,
            unsigned char B,
            unsigned char newB);
  template<class Type>
  static void undistort(const vpImage<Type> &I,
                        const vpCameraParameters &cam,
                        vpImage<Type> &newI);

  template<class Type>
  static void flip(const vpImage<Type> &I,
                        vpImage<Type> &newI);

  template<class Type>
  static void flip(vpImage<Type> &I);


  static void imageDifference(vpImage<unsigned char> &I1, 
                  vpImage<unsigned char> &I2,
                  vpImage<unsigned char> &Idiff) ;
} ;

template<class Type>
void vpImageTools::createSubImage(const vpImage<Type> &I,
                  unsigned int i_sub, unsigned int j_sub,
                  unsigned int nrow_sub, unsigned int ncol_sub,
                  vpImage<Type> &S)
{
  unsigned int i,j ;
  unsigned int imax = i_sub + nrow_sub ;
  unsigned int jmax = j_sub + ncol_sub ;

  if (imax > I.getHeight())
  {
    imax = I.getHeight() -1 ;
    nrow_sub = imax-i_sub ;
  }
  if (jmax > I.getWidth())
  {
    jmax = I.getWidth() -1 ;
    ncol_sub = jmax -j_sub ;
  }

  S.resize(nrow_sub, ncol_sub) ;
  for (i=i_sub ; i < imax ; i++)
    for (j=j_sub ; j < jmax ; j++)
    {
      S[i-i_sub][j-j_sub] = I[i][j] ;
    }
}
template<class Type>
void vpImageTools::createSubImage(const vpImage<Type> &I,
                  const vpRect &rect,
                  vpImage<Type> &S)
{
  double dleft   = rect.getLeft();
  double dtop    = rect.getTop();
  double dright  = ceil( rect.getRight() );
  double dbottom = ceil( rect.getBottom() );

  if (dleft < 0.0)                   dleft = 0.0;
  else if (dleft >= I.getWidth())    dleft = I.getWidth() - 1;

  if (dright < 0.0)                  dright = 0.0;
  else if (dright >= I.getWidth())   dright = I.getWidth() - 1;

  if (dtop < 0.0)                    dtop = 0.0;
  else if (dtop >= I.getHeight())    dtop = I.getHeight() - 1;

  if (dbottom < 0.0)                 dbottom = 0.0;
  else if (dbottom >= I.getHeight()) dbottom = I.getHeight() - 1;

  // Convert the double-precision rectangle coordinates into integer positions
  unsigned int left   = (unsigned int) dleft;
  unsigned int top    = (unsigned int) dtop;
  unsigned int bottom = (unsigned int) dbottom;
  unsigned int right  = (unsigned int) dright;

  unsigned int width  = right - left + 1;;
  unsigned int height = bottom - top + 1;

  S.resize(height, width) ;
  for (unsigned int i=top ; i <= bottom ; i++) {
    for (unsigned int j=left ; j <= right ; j++) {
      S[i-top][j-left] = I[i][j] ;
    }
  }
}
template<class Type>
void vpImageTools::binarise(vpImage<Type> &I,
                Type threshold1, Type threshold2,
                Type value1, Type value2, Type value3)
{
  unsigned char v;
  unsigned char *p = I.bitmap;
  unsigned char *pend = I.bitmap + I.getWidth()*I.getHeight();
  for (; p < pend; p ++) {
    v = *p;
    if (v < threshold1) *p = value1;
    else if (v > threshold2) *p = value3;
    else *p = value2;
  }

}

#ifdef VISP_HAVE_PTHREAD

#ifndef DOXYGEN_SHOULD_SKIP_THIS
template<class Type>
class vpUndistortInternalType
{
public:
  Type *src;
  Type *dst;
  unsigned int width;
  unsigned int height;
  vpCameraParameters cam;
  unsigned int nthreads;
  unsigned int threadid;
public:
  vpUndistortInternalType() {};
  vpUndistortInternalType(const vpUndistortInternalType<Type> &u) {
    src = u.src;
    dst = u.dst;
    width = u.width;
    height = u.height;
    cam = u.cam;
    nthreads = u.nthreads;
    threadid = u.threadid;
  };

  static void *vpUndistort_threaded(void *arg);
};


template<class Type>
void *vpUndistortInternalType<Type>::vpUndistort_threaded(void *arg)
{
  vpUndistortInternalType<Type> *undistortSharedData = (vpUndistortInternalType<Type>*)arg;
  int offset   = (int)undistortSharedData->threadid;
  int width    = (int)undistortSharedData->width;
  int height   = (int)undistortSharedData->height;
  int nthreads = (int)undistortSharedData->nthreads;

  double u0 = undistortSharedData->cam.get_u0();
  double v0 = undistortSharedData->cam.get_v0();
  double px = undistortSharedData->cam.get_px();
  double py = undistortSharedData->cam.get_py();
  double kud = undistortSharedData->cam.get_kud();

  double invpx = 1.0/px;
  double invpy = 1.0/py;

  double kud_px2 = kud * invpx * invpx;
  double kud_py2 = kud * invpy * invpy;

  Type *dst = undistortSharedData->dst+(height/nthreads*offset)*width;
  Type *src = undistortSharedData->src;

  for (double v = height/nthreads*offset;v < height/nthreads*(offset+1) ; v++) {
    double  deltav  = v - v0;
    //double fr1 = 1.0 + kd * (vpMath::sqr(deltav * invpy));
    double fr1 = 1.0 + kud_py2 * deltav * deltav;

    for (double u = 0 ; u < width ; u++) {
      //computation of u,v : corresponding pixel coordinates in I.
      double  deltau  = u - u0;
      //double fr2 = fr1 + kd * (vpMath::sqr(deltau * invpx));
      double fr2 = fr1 + kud_px2 * deltau * deltau;

      double u_double = deltau * fr2 + u0;
      double v_double = deltav * fr2 + v0;

      //computation of the bilinear interpolation

      //declarations
      int u_round  = (int) (u_double);
      int v_round  = (int) (v_double);
      if (u_round < 0.f) u_round = -1;
      if (v_round < 0.f) v_round = -1;
      double  du_double  = (u_double) - (double) u_round;
      double  dv_double  = (v_double) - (double) v_round;
      Type v01;
      Type v23;
      if ( (0 <= u_round) && (0 <= v_round) &&
       (u_round < ((width) - 1)) && (v_round < ((height) - 1)) ) {
    //process interpolation
    const Type* _mp = &src[v_round*width+u_round];
    v01 = (Type)(_mp[0] + ((_mp[1] - _mp[0]) * du_double));
    _mp += width;
    v23 = (Type)(_mp[0] + ((_mp[1] - _mp[0]) * du_double));
    *dst = (Type)(v01 + ((v23 - v01) * dv_double));
      }
      else {
    *dst = 0;
      }
      dst++;
    }
  }

  pthread_exit((void*) 0);
  return NULL;
}
#endif // DOXYGEN_SHOULD_SKIP_THIS
#endif // VISP_HAVE_PTHREAD

template<class Type>
void vpImageTools::undistort(const vpImage<Type> &I,
                             const vpCameraParameters &cam,
                             vpImage<Type> &undistI)
{
#ifdef VISP_HAVE_PTHREAD
  //
  // Optimized version using pthreads
  //
  unsigned int width = I.getWidth();
  unsigned int height = I.getHeight();

  undistI.resize(height, width);

  double kud = cam.get_kud();

  //if (kud == 0) {
  if (std::fabs(kud) <= std::numeric_limits<double>::epsilon()) {
    // There is no need to undistort the image
    undistI = I;
    return;
  }

  unsigned int nthreads = 2;
  pthread_attr_t attr;
  pthread_t *callThd = new pthread_t [nthreads];
  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);

  vpUndistortInternalType<Type> *undistortSharedData;
  undistortSharedData = new vpUndistortInternalType<Type> [nthreads];

  for(unsigned int i=0;i<nthreads;i++) {
    // Each thread works on a different set of data.
    //    vpTRACE("create thread %d", i);
    undistortSharedData[i].src      = I.bitmap;
    undistortSharedData[i].dst      = undistI.bitmap;
    undistortSharedData[i].width    = I.getWidth();
    undistortSharedData[i].height   = I.getHeight();
    undistortSharedData[i].cam      = cam;
    undistortSharedData[i].nthreads = nthreads;
    undistortSharedData[i].threadid = i;
    pthread_create( &callThd[i], &attr,
            &vpUndistortInternalType<Type>::vpUndistort_threaded,
            &undistortSharedData[i]);
  }
  pthread_attr_destroy(&attr);
  /* Wait on the other threads */

  for(unsigned int i=0;i<nthreads;i++) {
    //  vpTRACE("join thread %d", i);
    pthread_join( callThd[i], NULL);
  }

  delete [] callThd;
  delete [] undistortSharedData;
#else // VISP_HAVE_PTHREAD
  //
  // optimized version without pthreads
  //
  unsigned int width = I.getWidth();
  unsigned int height = I.getHeight();

  undistI.resize(height, width);

  double u0 = cam.get_u0();
  double v0 = cam.get_v0();
  double px = cam.get_px();
  double py = cam.get_py();
  double kud = cam.get_kud();

  //if (kud == 0) {
  if (std::fabs(kud) <= std::numeric_limits<double>::epsilon()) {
    // There is no need to undistort the image
    undistI = I;
    return;
  }

  double invpx = 1.0/px;
  double invpy = 1.0/py;

  double kud_px2 = kud * invpx * invpx;
  double kud_py2 = kud * invpy * invpy;

  Type *dst = undistI.bitmap;
  for (double v = 0;v < height ; v++) {
    double  deltav  = v - v0;
    //double fr1 = 1.0 + kd * (vpMath::sqr(deltav * invpy));
    double fr1 = 1.0 + kud_py2 * deltav * deltav;

    for (double u = 0 ; u < width ; u++) {
      //computation of u,v : corresponding pixel coordinates in I.
      double  deltau  = u - u0;
      //double fr2 = fr1 + kd * (vpMath::sqr(deltau * invpx));
      double fr2 = fr1 + kud_px2 * deltau * deltau;

      double u_double = deltau * fr2 + u0;
      double v_double = deltav * fr2 + v0;

      //printf("[%g][%g] %g %g : ", u, v, u_double, v_double );

      //computation of the bilinear interpolation

      //declarations
      int u_round  = (int) (u_double);
      int v_round  = (int) (v_double);
      if (u_round < 0.f) u_round = -1;
      if (v_round < 0.f) v_round = -1;
      double  du_double  = (u_double) - (double) u_round;
      double  dv_double  = (v_double) - (double) v_round;
      Type  v01;
      Type  v23;
      if ( (0 <= u_round) && (0 <= v_round) &&
           (u_round < (((int)width) - 1)) && (v_round < (((int)height) - 1)) ) {
        //process interpolation
        const Type* _mp = &I[(unsigned int)v_round][(unsigned int)u_round];
        v01 = (Type)(_mp[0] + ((_mp[1] - _mp[0]) * du_double));
        _mp += width;
        v23 = (Type)(_mp[0] + ((_mp[1] - _mp[0]) * du_double));
        *dst = (Type)(v01 + ((v23 - v01) * dv_double));
        //printf("R %d G %d B %d\n", dst->R, dst->G, dst->B);
      }
      else {
        *dst = 0;
      }
      dst++;
    }
  }
#endif // VISP_HAVE_PTHREAD




#if 0
  // non optimized version
  int width = I.getWidth();
  int height = I.getHeight();

  undistI.resize(height,width);

  double u0 = cam.get_u0();
  double v0 = cam.get_v0();
  double px = cam.get_px();
  double py = cam.get_py();
  double kd = cam.get_kud();

  if (kd == 0) {
    // There is no need to undistort the image
    undistI = I;
    return;
  }

  for(int v = 0 ; v < height; v++){
    for(int u = 0; u < height; u++){
      double r2 = vpMath::sqr(((double)u - u0)/px) +
    vpMath::sqr(((double)v-v0)/py);
      double u_double = ((double)u - u0)*(1.0+kd*r2) + u0;
      double v_double = ((double)v - v0)*(1.0+kd*r2) + v0;
      undistI[v][u] = I.getPixelBI((float)u_double,(float)v_double);
    }
  }
#endif
}

template<class Type>
void vpImageTools::flip(const vpImage<Type> &I,
                        vpImage<Type> &newI)
{
    unsigned int height = 0, width = 0;
    int i = 0;

    height = I.getHeight();
    width = I.getWidth();
    newI.resize(height, width);

    for ( i = 0; i < height; i++)
    {
      memcpy(newI.bitmap+i*width, I.bitmap+(height-1-i)*width,
         width*sizeof(Type));
    }
}


template<class Type>
void vpImageTools::flip(vpImage<Type> &I)
{
    unsigned int height = 0, width = 0;
    unsigned int i = 0;
    vpImage<Type> Ibuf;

    height = I.getHeight();
    width = I.getWidth();
    Ibuf.resize(1, width);

    for ( i = 0; i < height/2; i++)
    {
      memcpy(Ibuf.bitmap, I.bitmap+i*width,
                width*sizeof(Type));

      memcpy(I.bitmap+i*width, I.bitmap+(height-1-i)*width,
                width*sizeof(Type));
      memcpy(I.bitmap+(height-1-i)*width, Ibuf.bitmap,
                width*sizeof(Type));
    }
}

#endif


/*
 * Local variables:
 * c-basic-offset: 2
 * End:
 */