itkConstrainedValueDifferenceImageFilter.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 itkConstrainedValueDifferenceImageFilter_h
#define itkConstrainedValueDifferenceImageFilter_h
 
#include "itkBinaryGeneratorImageFilter.h"
#include "itkNumericTraits.h"
 
namespace itk
{
namespace Functor
{
template <typename TInput1, typename TInput2, typename TOutput>
class ConstrainedValueDifference
{
public:
  ConstrainedValueDifference() = default;
  ~ConstrainedValueDifference() = default;
  bool
  operator==(const ConstrainedValueDifference &) const
  {
    return true;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(ConstrainedValueDifference);
 
  inline TOutput
  operator()(const TInput1 & A, const TInput2 & B) const
  {
    const auto   dA = static_cast<double>(A);
    const auto   dB = static_cast<double>(B);
    const double diff = dA - dB;
    const double cdiff1 =
      diff > NumericTraits<TOutput>::NonpositiveMin() ? diff : NumericTraits<TOutput>::NonpositiveMin();
    const double cdiff2 = cdiff1 < NumericTraits<TOutput>::max() ? cdiff1 : NumericTraits<TOutput>::max();
 
    return static_cast<TOutput>(cdiff2);
  }
};
} // namespace Functor
 
template <typename TInputImage1, typename TInputImage2, typename TOutputImage>
class ConstrainedValueDifferenceImageFilter
  : public BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(ConstrainedValueDifferenceImageFilter);
 
  using Self = ConstrainedValueDifferenceImageFilter;
  using Superclass = BinaryGeneratorImageFilter<TInputImage1, TInputImage2, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
  using FunctorType = Functor::ConstrainedValueDifference<typename TInputImage1::PixelType,
                                                          typename TInputImage2::PixelType,
                                                          typename TOutputImage::PixelType>;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ConstrainedValueDifferenceImageFilter, BinaryGeneratorImageFilter);
 
#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro(Input1ConvertibleToDoubleCheck, (Concept::Convertible<typename TInputImage1::PixelType, double>));
  itkConceptMacro(Input2ConvertibleToDoubleCheck, (Concept::Convertible<typename TInputImage2::PixelType, double>));
  itkConceptMacro(DoubleConvertibleToOutputCheck, (Concept::Convertible<double, typename TOutputImage::PixelType>));
  itkConceptMacro(DoubleGreaterThanOutputCheck,
                  (Concept::GreaterThanComparable<double, typename TOutputImage::PixelType>));
  // End concept checking
#endif
 
protected:
  ConstrainedValueDifferenceImageFilter()
  {
#if !defined(ITK_WRAPPING_PARSER)
    Superclass::SetFunctor(FunctorType());
#endif
  }
 
  ~ConstrainedValueDifferenceImageFilter() override = default;
};
} // end namespace itk
 
#endif