fourier_filters.hh

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//------------------------------------------------------------------------------
// This file is part of the OpenStructure project <www.openstructure.org>
//
// Copyright (C) 2008-2011 by the OpenStructure authors
// Copyright (C) 2003-2010 by the IPLT authors
//
// This library 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 3.0 of the License, or (at your option)
// any later version.
// This library 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 this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//------------------------------------------------------------------------------

/*
  authors: Valerio Mariani, Andreas Schenk
*/


#ifndef IMG_ALG_FILTER_FOURIER_FILTERS_H
#define IMG_ALG_FILTER_FOURIER_FILTERS_H

#include <ost/img/algorithm.hh>
#include <ost/img/image_state.hh>
#include <ost/img/image_state.hh>

namespace ost { namespace img { namespace alg { 


class DLLEXPORT_IMG_ALG LowPassFilter : public ConstModIPAlgorithm
{
  public:

    LowPassFilter(Real limit=1.0):
      ConstModIPAlgorithm("LowPassFilter"),
      limit_(1.0/limit)
    {if(limit_==0.0)throw("Invalid limit");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

  private:

    Real limit_;
};


class DLLEXPORT_IMG_ALG HighPassFilter : public ConstModIPAlgorithm
{
  public:

    HighPassFilter(Real limit=1.0):
      ConstModIPAlgorithm("HighPassFilter"),
      limit_(1.0/limit)
    {if(limit_==0.0)throw("Invalid limit");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

  private:

    Real limit_;
};



class DLLEXPORT_IMG_ALG GaussianLowPassFilter : public ConstModIPAlgorithm
{
  public:

    GaussianLowPassFilter(Real limit=1.0):
      ConstModIPAlgorithm("GaussianLowPassFilter"),
      limit_(1.0/limit)
    {if(limit_==0.0)throw("Invalid limit");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

  private:

    Real limit_;
};


class DLLEXPORT_IMG_ALG GaussianHighPassFilter : public ConstModIPAlgorithm
{
  public:

    GaussianHighPassFilter(Real limit=1.0):
      ConstModIPAlgorithm("GaussianHighPassFilter"),
      limit_(1.0/limit)
    {if(limit_==0.0)throw("Invalid limit");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

  private:

    Real limit_;
};



class DLLEXPORT_IMG_ALG FermiLowPassFilter : public ConstModIPAlgorithm
{
  public:

    FermiLowPassFilter(Real limit=1.0, Real t=1.0):
      ConstModIPAlgorithm("FermiLowPassFilter"),
      limit_(1.0/limit),
      t_(1.0/t)
    {if(limit_==0.0)throw("Invalid limit");if(t_==0.0)throw("Invalid t");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

    void SetT(Real t)               {if(t_==0.0)throw("Invalid t");t_=1.0/t;}
    Real GetT()                     {return 1.0/t_;}

  private:

    Real limit_;
    Real t_;
};


class DLLEXPORT_IMG_ALG FermiHighPassFilter : public ConstModIPAlgorithm
{
  public:

    FermiHighPassFilter(Real limit=1.0, Real t=1.0):
      ConstModIPAlgorithm("FermiLowPassFilter"),
      limit_(1.0/limit),
      t_(-1.0/t)
    {if(limit_==0.0)throw("Invalid limit");if(t_==0.0)throw("Invalid t");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

    void SetT(Real t)               {if(t_==0.0)throw("Invalid t");t_=-1.0/t;}
    Real GetT()                     {return -1.0/t_;}

  private:

    Real limit_;
    Real t_;
};


class DLLEXPORT_IMG_ALG ButterworthLowPassFilter : public ConstModIPAlgorithm
{
  public:

    ButterworthLowPassFilter(Real limit=1.0,Real stop=1.0):
      ConstModIPAlgorithm("ButterworthLowPassFilter"),
      limit_(1.0/limit),
      stop_(1.0/stop),
      eps_(0.882), 
      a_(10.624)
    {if(limit_==0.0)throw("Invalid limit");if(stop==0.0)throw("Invalid stop");}
           
    virtual void Visit(ImageHandle& ih) const ;

    void SetLimit(Real limit)       {if(limit_==0.0)throw("Invalid limit");limit_=1.0/limit;}
    Real GetLimit()                 {return 1.0/limit_;}

    void SetStop(Real stop) {if(stop==0.0)throw("Invalid stop");stop_=1.0/stop;}
    Real GetStop()          {return 1.0/stop_;}

    void SetEps(Real eps)   {eps_=eps;}
    Real GetEps()           {return eps_;}

    void SetA(Real a)       {a_=a;}
    Real GetA()             {return a_;}
      
  private:

    Real limit_;
    Real stop_;
    Real eps_;
    Real a_;       
};


class DLLEXPORT_IMG_ALG ButterworthHighPassFilter : public ButterworthLowPassFilter
{
public:
  ButterworthHighPassFilter(Real limit=1.0,Real stop=1.0):
    ButterworthLowPassFilter(limit,stop){}

};

}}} //ns

#endif // IPLT_ALG_FILTER_FOURIER_FILTERS_H