itkSquaredDifferenceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSquaredDifferenceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2003/01/05 23:38:22 $
  Version:   $Revision: 1.1 $

  Copyright (c) 2002 Insight 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 __itkSquaredDifferenceImageFilter_h
#define __itkSquaredDifferenceImageFilter_h

#include "itkBinaryFunctorImageFilter.h"

namespace itk
{
  
namespace Functor {  
  
  template< class TInput1, class TInput2, class TOutput>
  class SquaredDifference2
  {
  public:
    SquaredDifference2() {};
    ~SquaredDifference2() {};
    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;
      return static_cast<TOutput>( diff * diff );
    }
  }; 
}

template <class TInputImage1, class TInputImage2, class TOutputImage>
class ITK_EXPORT SquaredDifferenceImageFilter :
    public
    BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
            Functor::SquaredDifference2< 
                      typename TInputImage1::PixelType, 
                      typename TInputImage2::PixelType,
                      typename TOutputImage::PixelType>   >
{
public:
  typedef SquaredDifferenceImageFilter  Self;
  typedef BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage, 
                      Functor::SquaredDifference2< 
                      typename TInputImage1::PixelType, 
                      typename TInputImage2::PixelType,
                      typename TOutputImage::PixelType>   
                        >  Superclass;
  typedef SmartPointer<Self>   Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

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

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

};

} // end namespace itk


#endif

---