itkConstrainedValueDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConstrainedValueDifferenceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2007-09-27 11:36:40 $
  Version:   $Revision: 1.7 $

  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 __itkConstrainedValueDifferenceImageFilter_h
#define __itkConstrainedValueDifferenceImageFilter_h

#include "itkBinaryFunctorImageFilter.h"
#include "itkNumericTraits.h"

namespace itk
{
  
namespace Functor {  
  
template< class TInput1, class TInput2, class TOutput>
class ConstrainedValueDifference
{
public:
  ConstrainedValueDifference() {};
  ~ConstrainedValueDifference() {};
  bool operator!=( const ConstrainedValueDifference & ) const
    {
    return false;
    }
  bool operator==( const ConstrainedValueDifference & 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 cdiff1 = diff > NumericTraits<TOutput>::NonpositiveMin() ?
      diff : NumericTraits<TOutput>::NonpositiveMin(); 
    const double cdiff2 = cdiff1 < NumericTraits<TOutput>::max() ?
      cdiff1 : NumericTraits<TOutput>::max();
    return static_cast<TOutput>( cdiff2 );
    }
}; 
}

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

  itkNewMacro(Self);

  itkTypeMacro(ConstrainedValueDifferenceImageFilter, 
               BinaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(Input1ConvertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage1::PixelType, double>));
  itkConceptMacro(Input2ConvertibleToDoubleCheck,
    (Concept::Convertible<typename TInputImage2::PixelType, double>));
  itkConceptMacro(DoubleConvertibleToOutputCheck,
    (Concept::Convertible<double, typename TOutputImage::PixelType>));
  itkConceptMacro(DoubleGreaterThanOutputCheck,
    (Concept::GreaterThanComparable<double, typename TOutputImage::PixelType>));

#endif

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

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

};

} // end namespace itk


#endif

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