itkSquaredDifferenceImageFilter.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#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() {}
  bool operator!=(const SquaredDifference2 &) const
  {
    return false;
  }

  bool operator==(const SquaredDifference2 & other) const
  {
    return !( *this != other );
  }

  inline TOutput operator()(const TInput1 & A,
                            const TInput2 & B) const
  {
    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);

  itkTypeMacro(SquaredDifferenceImageFilter,
               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 > ) );

#endif
protected:
  SquaredDifferenceImageFilter() {}
  virtual ~SquaredDifferenceImageFilter() {}
private:
  SquaredDifferenceImageFilter(const Self &); //purposely not implemented
  void operator=(const Self &);               //purposely not implemented
};
} // end namespace itk

#endif