itkAbsoluteValueDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkAbsoluteValueDifferenceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2007/09/27 11:36:39 $
  Version:   $Revision: 1.6 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 __itkAbsoluteValueDifferenceImageFilter_h
#define __itkAbsoluteValueDifferenceImageFilter_h

#include "itkBinaryFunctorImageFilter.h"
#include "itkConceptChecking.h"

namespace itk
{
  
namespace Functor {  
  
template< class TInput1, class TInput2, class TOutput>
class AbsoluteValueDifference2
{
public:
  AbsoluteValueDifference2() {};
  ~AbsoluteValueDifference2() {};
  bool operator!=( const AbsoluteValueDifference2 & ) const
  {
    return false;
  }
  bool operator==( const AbsoluteValueDifference2 & other ) const
  {
    return !(*this != other);
  }
  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;
    const double absdiff = ( diff > 0.0 ) ? diff : -diff; 
    return static_cast<TOutput>( absdiff );
  }
}; 
}

template <class TInputImage1, class TInputImage2, class TOutputImage>
class ITK_EXPORT AbsoluteValueDifferenceImageFilter :
    public
BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                         Functor::AbsoluteValueDifference2< 
  typename TInputImage1::PixelType, 
  typename TInputImage2::PixelType,
  typename TOutputImage::PixelType>   >
{
public:
  typedef AbsoluteValueDifferenceImageFilter  Self;
  typedef BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                                   Functor::AbsoluteValueDifference2< 
    typename TInputImage1::PixelType, 
    typename TInputImage2::PixelType,
    typename TOutputImage::PixelType>   
  >  Superclass;
  typedef SmartPointer<Self>   Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(AbsoluteValueDifferenceImageFilter, 
               BinaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(Input1CovertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage1::PixelType, double>));
  itkConceptMacro(Input2ConvertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage2::PixelType, double>));
  itkConceptMacro(DoubleCovertibleToOutputCheck,
    (Concept::Convertible<double, typename TOutputImage::PixelType>));

#endif

protected:
  AbsoluteValueDifferenceImageFilter() {}
  virtual ~AbsoluteValueDifferenceImageFilter() {}

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

};

} // end namespace itk


#endif

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