itkTensorFractionalAnisotropyImageFilter.h

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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 itkTensorFractionalAnisotropyImageFilter_h
#define itkTensorFractionalAnisotropyImageFilter_h
 
#include "itkUnaryFunctorImageFilter.h"
#include "itkImage.h"
 
namespace itk
{
// This functor class invokes the computation of fractional anisotropy from
// every pixel.
namespace Functor
{
template <typename TInput>
class TensorFractionalAnisotropyFunction
{
public:
  using RealValueType = typename TInput::RealValueType;
  bool
  operator==(const TensorFractionalAnisotropyFunction &) const
  {
    return true;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(TensorFractionalAnisotropyFunction);
 
  inline RealValueType
  operator()(const TInput & x) const
  {
    return x.GetFractionalAnisotropy();
  }
};
} // end namespace Functor

template <typename TInputImage,
          typename TOutputImage =
            Image<typename NumericTraits<typename TInputImage::PixelType::ValueType>::RealType, TInputImage::Dimension>>
class TensorFractionalAnisotropyImageFilter
  : public UnaryFunctorImageFilter<TInputImage,
                                   TOutputImage,
                                   Functor::TensorFractionalAnisotropyFunction<typename TInputImage::PixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(TensorFractionalAnisotropyImageFilter);

  using Self = TensorFractionalAnisotropyImageFilter;
  using Superclass =
    UnaryFunctorImageFilter<TInputImage,
                            TOutputImage,
                            Functor::TensorFractionalAnisotropyFunction<typename TInputImage::PixelType>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using typename Superclass::OutputImageType;
  using OutputPixelType = typename TOutputImage::PixelType;
  using InputPixelType = typename TInputImage::PixelType;
  using InputValueType = typename InputPixelType::ValueType;

  itkOverrideGetNameOfClassMacro(TensorFractionalAnisotropyImageFilter);

  itkNewMacro(Self);

  void
  PrintSelf(std::ostream & os, Indent indent) const override
  {
    this->Superclass::PrintSelf(os, indent);
  }
 
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputValueType>));
 
protected:
  TensorFractionalAnisotropyImageFilter() = default;
  ~TensorFractionalAnisotropyImageFilter() override = default;
};
} // end namespace itk
 
#endif