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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkExpNegativeImageFilter.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 __itkExpNegativeImageFilter_h
#define __itkExpNegativeImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "vnl/vnl_math.h"
namespace itk
{
/** \class ExpNegativeImageFilter
* \brief Computes the function vcl_exp(-K.x) pixel-wise
*
* Every output pixel is equal to vcl_exp(-K.x ). where x is the intensity of the
* homologous input pixel, and K is a user-provided constant.
*
* \ingroup IntensityImageFilters Multithreaded
*
*/
namespace Function {
template< class TInput, class TOutput>
class ExpNegative
{
public:
ExpNegative() { m_Factor = 1.0; }
~ExpNegative() {};
bool operator!=( const ExpNegative & other ) const
{
if( m_Factor != other.m_Factor )
{
return true;
}
return false;
}
bool operator==( const ExpNegative & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput & A ) const
{
return static_cast<TOutput>( vcl_exp(- m_Factor * static_cast<double>(A) ) );
}
void SetFactor( double factor )
{
m_Factor = factor;
}
double GetFactor() const
{
return m_Factor;
}
private:
double m_Factor;
};
}
template <class TInputImage, class TOutputImage>
class ITK_EXPORT ExpNegativeImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Function::ExpNegative<
typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef ExpNegativeImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage,TOutputImage,
Function::ExpNegative< typename TInputImage::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(ExpNegativeImageFilter,
UnaryFunctorImageFilter);
void SetFactor( double factor )
{
if( factor == this->GetFunctor().GetFactor() )
{
return;
}
this->GetFunctor().SetFactor( factor );
this->Modified();
}
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputConvertibleToDoubleCheck,
(Concept::Convertible<typename TInputImage::PixelType, double>));
itkConceptMacro(DoubleConvertibleToOutputCheck,
(Concept::Convertible<double, typename TOutputImage::PixelType>));
/** End concept checking */
#endif
protected:
ExpNegativeImageFilter() {}
virtual ~ExpNegativeImageFilter() {}
private:
ExpNegativeImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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