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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkExpNegativeImageFilter_h
#define itkExpNegativeImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkMath.h"
namespace itk
{
namespace Functor
{
/**
* \class ExpNegative
* \brief
* \ingroup ITKImageIntensity
*/
template <typename TInput, typename TOutput>
class ExpNegative
{
public:
ExpNegative() { m_Factor = 1.0; }
~ExpNegative() = default;
bool
operator==(const ExpNegative & other) const
{
return Math::ExactlyEquals(m_Factor, other.m_Factor);
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(ExpNegative);
inline TOutput
operator()(const TInput & A) const
{
return static_cast<TOutput>(std::exp(-m_Factor * static_cast<double>(A)));
}
/** Sets the value 'K' used in the function evaluation exp(-K.x). */
void
SetFactor(double factor)
{
m_Factor = factor;
}
double
GetFactor() const
{
return m_Factor;
}
private:
double m_Factor;
};
} // namespace Functor
/**
* \class ExpNegativeImageFilter
* \brief Computes the function exp(-K.x) for each input pixel.
*
* Every output pixel is equal to std::exp(-K.x ). where x is the
* intensity of the homologous input pixel, and K is a user-provided
* constant.
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
*
* \ingroup ITKImageIntensity
*/
template <typename TInputImage, typename TOutputImage>
class ExpNegativeImageFilter
: public UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::ExpNegative<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ExpNegativeImageFilter);
/** Standard class type aliases. */
using Self = ExpNegativeImageFilter;
using Superclass =
UnaryFunctorImageFilter<TInputImage,
TOutputImage,
Functor::ExpNegative<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ExpNegativeImageFilter);
void
SetFactor(double factor)
{
if (factor == this->GetFunctor().GetFactor())
{
return;
}
this->GetFunctor().SetFactor(factor);
this->Modified();
}
double
GetFactor() const
{
return this->GetFunctor().GetFactor();
}
#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() = default;
~ExpNegativeImageFilter() override = default;
};
} // end namespace itk
#endif
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