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/*=========================================================================
Copyright (c) Kitware, Inc.
All rights reserved.
See Copyright.txt or http://www.kitware.com/VolViewCopyright.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 notice for more information.
=========================================================================*/
#ifndef __itkScaledSubtractImageFilter_h
#define __itkScaledSubtractImageFilter_h
#include "itkBinaryFunctorImageFilter.h"
namespace itk
{
/** \class ScaledSubtractImageFilter
* \brief Implements an operator for pixel-wise subtraction of two images.
*
* Output = Input1 - Input2.
*
* This class 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.
*
* \ingroup IntensityImageFilters Multithreaded
*/
namespace Function {
template< class TInput1, class TInput2=TInput1, class TOutput=TInput1>
class ScaledSub2
{
public:
typedef typename NumericTraits< TInput1 >::RealType RealType;
ScaledSub2() {}
~ScaledSub2() {}
bool operator!=( const ScaledSub2 & ) const
{
return false;
}
bool operator==( const ScaledSub2 & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput1 & A, const TInput2 & B) const
{ return (TOutput)( A - m_Scale * B); }
void SetScale( RealType alpha )
{
m_Scale = alpha;
}
RealType GetScale() const
{
return m_Scale;
}
private:
double m_Scale;
};
}
template <class TInputImage1, class TInputImage2=TInputImage1, class TOutputImage=TInputImage1>
class ITK_EXPORT ScaledSubtractImageFilter :
public
BinaryFunctorImageFilter<TInputImage1,TInputImage2,TOutputImage,
Function::ScaledSub2<
typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef ScaledSubtractImageFilter Self;
typedef BinaryFunctorImageFilter<
TInputImage1,TInputImage2,TOutputImage,
Function::ScaledSub2< typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType> > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef typename Superclass::FunctorType FunctorType;
typedef typename FunctorType::RealType RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(ScaledSubtractImageFilter,
BinaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(Input1Input2OutputAdditiveOperatorsCheck,
(Concept::AdditiveOperators<typename TInputImage1::PixelType,
typename TInputImage2::PixelType,
typename TOutputImage::PixelType>));
/** End concept checking */
#endif
void SetScale( RealType alpha )
{
this->GetFunctor().SetScale( alpha );
this->Modified();
}
protected:
ScaledSubtractImageFilter() {}
virtual ~ScaledSubtractImageFilter() {}
private:
ScaledSubtractImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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