ExampleGradient.cpp

Example for gradient filtering images

Author

MIP

/*
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
  Multimediale Systeme der Informationsverarbeitung
  Institut fuer Informatik
  Christian-Albrechts-Universitaet Kiel


BIAS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

BIAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/** 
    @example ExampleGradient.cpp
    @brief Example for gradient filtering images
    @relates Gradient
    @ingroup g_examples 
    @author MIP
*/


#include <Filter/FilterNTo2N.hh>
#include <Filter/GradientSobel3x3.hh>
#include <Filter/GradientGauss.hh>
#include <Filter/GradientGaussAsymmetric.hh>
#include <Base/Image/ImageIO.hh>
#include <Base/Image/ImageConvert.hh>
#include <Base/Debug/TimeMeasure.hh>

#include <Base/Common/BIASpragma.hh>

using namespace BIAS;
using namespace std;

#define InputImageType unsigned char
#define OutputImageType float

int main(int argc, char *argv[])
{
  TimeMeasure Timer1;

  FilterNTo2N<InputImageType, OutputImageType> *grad = NULL;
  GradientSobel3x3<InputImageType, OutputImageType> gsobel3x3;
  GradientGauss<InputImageType, OutputImageType> ggauss;
  GradientGaussAsymmetric<InputImageType, OutputImageType>  ggaussasymmetric;

  // set parameters
  ggauss.SetGradGaussSigma(1.0);
  ggauss.SetGradGaussRatio(0.01);

  Image<unsigned char> ucim;
  Image<InputImageType> im;
  Image<OutputImageType> gx, gy, g;

 //  if (argc-argind<1 || argind<1){
//     cerr << argv[0] << " [parameter] <im1> <im2> [ <im3> ... ] \n";
//     para.Usage(cerr);
//     return -2;
//   }


  int gt = 1;
  switch (gt){
  case 0:
    grad = &gsobel3x3;
    cerr <<"Sobel3x3\n";
    break;
  case 1:
    grad = &ggauss;
    cerr <<"GradientGauss\n";
    break;
  case 2:
    grad = &ggaussasymmetric;
    cerr <<"GradientGaussAsymmetric\n";
    break;
  default:
    BIASERR("unknown gradient type");
    BIASABORT;
    break;
  }
  grad->AddDebugLevel(D_GRADGAUSS_KERNEL);
  grad->AddDebugLevel(D_CONV_KERNEL);
  grad->AddDebugLevel(D_GRAD_DEB);

  grad->SetBorderHandling(FilterBase<InputImageType,
                          OutputImageType>::TBH_valid);
  int argind = 1;
  for (int i=argind; i<argc; i++){
    if (ImageIO::Load(argv[i], im)!=0){
      BIASERR("error loading image "<<argv[i]);
      return -1;
    } else {
      cerr << "read "<<argv[i]<<endl;
    }

#if type != 1
    //  if (ImageConvert::ConvertST(ucim, im, ImageBase::ST_float)!=0){
    //  BIASERR("error converting image "<<argv[i]);
    //}
#endif

    Timer1.Start();
    gsobel3x3.Filter(im, gx, gy, g);
    Timer1.Stop();

    ostringstream name;
    name << "gradx-"<<setw(4)<<setfill('0')<<i-argind<<".mip";
    //ImageIO::Save(name.str(), gx);
    ImageIO::Save(name.str(), gx);
    name.str("");
    name << "grady-"<<setw(4)<<setfill('0')<<i-argind<<".mip";
    //ImageIO::Save(name.str(), gy);
    ImageIO::Save(name.str(), gy);
    name.str("");
    name << "grad-"<<setw(4)<<setfill('0')<<i-argind<<".mip";
    //ImageIO::Save(name.str(), g);
    ImageIO::Save(name.str(), g);
  }

    Timer1.Print();

  return 0;
}