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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 itkComplexToPhaseImageAdaptor_h
#define itkComplexToPhaseImageAdaptor_h
#include "itkImageAdaptor.h"
#include <complex>
namespace itk
{
namespace Accessor
{
/**
* \class ComplexToPhasePixelAccessor
* \brief Give access to the Phase part of a std::complex<> value.
*
* ComplexToPhasePixelAccessor is templated over an internal type and an
* external type representation. The internal type is an std::complex<T> and
* the external part is a type T. This class casts the input, applies the function
* to it, and casts the result according to the types defined as template
* parameters.
*
* \ingroup ImageAdaptors
* \ingroup ITKImageAdaptors
*/
template <typename TInternalType, typename TExternalType>
class ComplexToPhasePixelAccessor
{
public:
/** External type alias. It defines the external aspect
* that this class will exhibit. */
using ExternalType = TExternalType;
/** Internal type alias. It defines the internal phase
* representation of data. */
using InternalType = TInternalType;
static inline void
Set(TInternalType & output, const TExternalType & input)
{
output = (TInternalType)(input);
}
static inline TExternalType
Get(const TInternalType & input)
{
return (TExternalType)(std::atan2(input.imag(), input.real()));
}
};
} // end namespace Accessor
/**
* \class ComplexToPhaseImageAdaptor
* \brief Presents a complex image as being composed of arg() part of its pixels.
*
* Additional casting is performed according to the input and output image
* types following C++ default casting rules.
*
* \ingroup ImageAdaptors
* \ingroup ITKImageAdaptors
*/
template <typename TImage, typename TOutputPixelType>
class ComplexToPhaseImageAdaptor
: public ImageAdaptor<TImage, Accessor::ComplexToPhasePixelAccessor<typename TImage::PixelType, TOutputPixelType>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ComplexToPhaseImageAdaptor);
/** Standard class type aliases. */
using Self = ComplexToPhaseImageAdaptor;
using Superclass =
ImageAdaptor<TImage, Accessor::ComplexToPhasePixelAccessor<typename TImage::PixelType, TOutputPixelType>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ComplexToPhaseImageAdaptor);
protected:
ComplexToPhaseImageAdaptor() = default;
~ComplexToPhaseImageAdaptor() override = default;
};
} // end namespace itk
#endif
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