itkConstrainedValueDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkConstrainedValueDifferenceImageFilter.h,v $
  Language:  C++

  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() {};
  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 cdiff = ( diff > NumericTraits<TOutput>::min() ) ? diff : NumericTraits<TOutput>::min(); 
    return static_cast<TOutput>( cdiff );
  }
}; 
}

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);
  
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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