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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 itkPowImageFilter_h
#define itkPowImageFilter_h
#include "itkBinaryGeneratorImageFilter.h"
#include "itkNumericTraits.h"
namespace itk
{
namespace Functor
{
/**
* \class Pow
* \brief
* \ingroup ITKImageIntensity
*/
template <typename TInput1, typename TInput2 = TInput1, typename TOutput = TInput1>
class Pow
{
public:
Pow() = default;
bool
operator==(const Pow &) const
{
return true;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(Pow);
inline TOutput
operator()(const TInput1 & A, const TInput2 & B) const
{
using RealType1 = typename NumericTraits<TInput1>::RealType;
using RealType2 = typename NumericTraits<TInput2>::RealType;
return static_cast<TOutput>(std::pow(static_cast<RealType1>(A), static_cast<RealType2>(B)));
}
};
} // namespace Functor
/**
* \class PowImageFilter
* \brief Computes the powers of 2 images
*
* This class is templated 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 output of the pow function will be cast to the pixel type of
* the output image.
*
* The total operation over one pixel will be
\code
output_pixel = static_cast< TOutput >( std::pow(static_cast<RealType>(A),static_cast<RealType>(B)) );
\endcode
*
* The pow function can be applied to two images with the following:
\code
SetInput1( image1 );
SetInput2( image2 );
\endcode
*
* Additionally, this filter can be used to raise every pixel of an
* image to a power of a constant by using
\code
SetInput1( image1 );
SetConstant2( constant );
\endcode
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*
*/
template <typename TInputImage1, typename TInputImage2 = TInputImage1, typename TOutputImage = TInputImage1>
class ITK_TEMPLATE_EXPORT PowImageFilter : public BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(PowImageFilter);
/** Standard class type aliases. */
using Self = PowImageFilter;
using Superclass = BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using FunctorType =
Functor::Pow<typename TInputImage1::PixelType, typename TInputImage2::PixelType, typename TOutputImage::PixelType>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(PowImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
// End concept checking
#endif
protected:
PowImageFilter()
{
#if !defined(ITK_WRAPPING_PARSER)
Superclass::SetFunctor(FunctorType());
#endif
}
~PowImageFilter() override = default;
};
} // end namespace itk
#endif
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