freDifferenceToRGBImageFilter.h

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/*=========================================================================

  Program:   F.R.E.E. - flexible registration evaluation engine
  Version:   v.1.0.0
  Date:      $Date: 2006/09/01 12:00:00 $
  Module:    $RCSfile: freDifferenceToRGBImageFilter.h,v $
  Language:  C++



  Copyright (c) 2007 Ralf o Floca (Department of Medical Informatics,
  Institute for Medical Biometry and Informatics, University of Heidelberg,
  Germany). All rights reserved.
  See FREECopyright.txt or http://www.mi.med.uni-hd.de/free/copyright.htm
  for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/

#ifndef __freDifferenceToRGBImageFilter_h
#define __freDifferenceToRGBImageFilter_h

#include "itkBinaryFunctorImageFilter.h"

namespace FREE
{
  
namespace Functor
{  
  
template< class TInput1, class TInput2, class TOutput>
class DifferenceToRGBFunctor
{
public:
  DifferenceToRGBFunctor() {};
  ~DifferenceToRGBFunctor() {};
  inline TOutput operator()( const TInput1 & A, 
                             const TInput2 & B)
  {
    const double dA = static_cast<double>( A );
    const double dB = static_cast<double>( B );
    const double diff = dA - dB;

                TOutput output;
                output.Fill(0);

                if (diff < 0.0) output.SetElement(1,static_cast<typename TOutput::ValueType>( abs(diff)));
                else if (diff > 0.0) output.SetElement(0,static_cast<typename TOutput::ValueType>( abs(diff)));

    return output;
  }
}; 
}

template <class TInputImage1, class TInputImage2, class TOutputImage>
class ITK_EXPORT DifferenceToRGBImageFilter : public
                itk::BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                         Functor::DifferenceToRGBFunctor< 
  typename TInputImage1::PixelType, 
  typename TInputImage2::PixelType,
  typename TOutputImage::PixelType>   >
{
public:
  typedef DifferenceToRGBImageFilter  Self;
        typedef itk::BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                                                                                                                                                          Functor::DifferenceToRGBFunctor< 
    typename TInputImage1::PixelType, 
    typename TInputImage2::PixelType,
    typename TOutputImage::PixelType>   
  >  Superclass;

        typedef itk::SmartPointer<Self>   Pointer;
  typedef itk::SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);
  
protected:
  DifferenceToRGBImageFilter() {}
  virtual ~DifferenceToRGBImageFilter() {}

private:
  DifferenceToRGBImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};

} // end namespace FREE


#endif

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