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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 itkAcosImageFilter_h
#define itkAcosImageFilter_h
#include "itkUnaryGeneratorImageFilter.h"
#include "itkMath.h"
namespace itk
{
namespace Functor
{
/**
* \class Acos
* \brief Computes the Acos of a pixel.
* \ingroup ITKImageIntensity
*/
template <typename TInput, typename TOutput>
class Acos
{
public:
bool
operator==(const Acos &) const
{
return true;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(Acos);
inline TOutput
operator()(const TInput & A) const
{
return static_cast<TOutput>(std::acos(static_cast<double>(A)));
}
};
} // namespace Functor
/**
* \class AcosImageFilter
* \brief Computes the inverse cosine of each pixel.
*
* This filter is templated over the pixel type of the input image
* and the pixel type of the output image.
*
* The filter walks over all the pixels in the input image, and for
* each pixel does do the following:
*
* \li cast the pixel value to \c double,
* \li apply the \c std::acos() function to the \c double value
* \li cast the \c double value resulting from \c std::acos() to the pixel type
* of the output image
* \li store the casted value into the output image.
*
* The filter expects both images to have the same dimension (e.g. both 2D,
* or both 3D, or both ND).
*
* \ingroup IntensityImageFilters
* \ingroup MultiThreaded
* \ingroup ITKImageIntensity
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT AcosImageFilter : public UnaryGeneratorImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(AcosImageFilter);
/** Standard class type aliases. */
using Self = AcosImageFilter;
using Superclass = UnaryGeneratorImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using FunctorType = Functor::Acos<typename TInputImage::PixelType, typename TOutputImage::PixelType>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(AcosImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputCovertibleToDoubleCheck, (Concept::Convertible<typename TInputImage::PixelType, double>));
itkConceptMacro(DoubleConvertibleToOutputCheck, (Concept::Convertible<double, typename TOutputImage::PixelType>));
// End concept checking
#endif
protected:
AcosImageFilter()
{
#if !defined(ITK_WRAPPING_PARSER)
Superclass::SetFunctor(FunctorType());
#endif
}
~AcosImageFilter() override = default;
};
} // end namespace itk
#endif
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