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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkSquaredDifferenceImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:41 $
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 __itkSquaredDifferenceImageFilter_h
#define __itkSquaredDifferenceImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
namespace itk
{
/** \class SquaredDifferenceImageFilter
* \brief Implements pixel-wise the computation of squared difference.
*
* This filter is parametrized over the types of the two
* input images and the type of the output image.
*
* Numeric conversions (castings) are done by the C++ defaults.
*
* The filter will walk over all the pixels in the two input images, and for
* each one of them it will do the following:
*
* - cast the input 1 pixel value to \c double
* - cast the input 2 pixel value to \c double
* - compute the difference of the two pixel values
* - compute the square of the difference
* - cast the \c double value resulting from \c sqr() to the pixel type of the output image
* - store the casted value into the output image.
*
* The filter expect all images to have the same dimension
* (e.g. all 2D, or all 3D, or all ND)
*
* \ingroup IntensityImageFilters Multithreaded
*/
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 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:
/** Standard class typedefs. */
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;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(SquaredDifferenceImageFilter,
BinaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin 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>));
/** End concept checking */
#endif
protected:
SquaredDifferenceImageFilter() {}
virtual ~SquaredDifferenceImageFilter() {}
private:
SquaredDifferenceImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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