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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkDivideByConstantImageFilter.h
Language: C++
Date: $Date$
Version: $Revision$
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 __itkDivideByConstantImageFilter_h
#define __itkDivideByConstantImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
/** \class DivideByConstantImageFilter
*
* \brief Divide input pixels by a constant.
*
* This filter is templated over the input image type
* and the output image type.
*
* \author Tom Vercauteren, INRIA & Mauna Kea Technologies
*
* This implementation was taken from the Insight Journal paper:
* http://hdl.handle.net/1926/510
*
* \ingroup IntensityImageFilters Multithreaded
* \sa UnaryFunctorImageFilter
*/
namespace Functor {
template< class TInput, class TConstant, class TOutput>
class DivideByConstant
{
public:
DivideByConstant() : m_Constant(NumericTraits<TConstant>::One) {};
~DivideByConstant() {};
bool operator!=( const DivideByConstant & other ) const
{
return !(*this == other);
}
bool operator==( const DivideByConstant & other ) const
{
return other.m_Constant == m_Constant;
}
inline TOutput operator()( const TInput & A ) const
{
// Because the user has to specify the constant we don't
// check if the constant is not too small (i.e. almost equal to zero);
return static_cast<TOutput>( A / m_Constant );
}
void SetConstant(TConstant ct)
{
if( ct == NumericTraits<TConstant>::Zero )
{
itkGenericExceptionMacro(
<<"The constant value used as denominator should not be set to zero");
}
this->m_Constant = ct;
}
const TConstant & GetConstant() const { return m_Constant; }
TConstant m_Constant;
};
}
template <class TInputImage, class TConstant, class TOutputImage>
class ITK_EXPORT DivideByConstantImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::DivideByConstant<
typename TInputImage::PixelType, TConstant,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef DivideByConstantImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage,TOutputImage, Functor::DivideByConstant<
typename TInputImage::PixelType, TConstant,
typename TOutputImage::PixelType> > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(DivideByConstantImageFilter, UnaryFunctorImageFilter);
/** Set the constant value that will be used for dividing all the image
* pixels */
void SetConstant(TConstant ct)
{
if( ct != this->GetFunctor().GetConstant() )
{
this->GetFunctor().SetConstant(ct);
this->Modified();
}
}
const TConstant & GetConstant() const
{
return this->GetFunctor().GetConstant();
}
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputConvertibleToOutputCheck,
(Concept::Convertible<typename TInputImage::PixelType,
typename TOutputImage::PixelType>));
// The following concept check doesn't seem to work with vector immages
//itkConceptMacro(Input1Input2OutputDivisionOperatorsCheck,
// (Concept::DivisionOperators<typename TInputImage::PixelType,
// TConstant,
// typename TOutputImage::PixelType>));
/** End concept checking */
#endif
protected:
DivideByConstantImageFilter() {};
virtual ~DivideByConstantImageFilter() {};
void PrintSelf(std::ostream &os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Constant: "
<< static_cast<typename NumericTraits<TConstant>::PrintType>(this->GetConstant())
<< std::endl;
}
private:
DivideByConstantImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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