itkVectorConnectedComponentImageFilter.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.
 *
 *=========================================================================*/
/*=========================================================================
 *
 *  Portions of this file are subject to the VTK Toolkit Version 3 copyright.
 *
 *  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
 *
 *  For complete copyright, license and disclaimer of warranty information
 *  please refer to the NOTICE file at the top of the ITK source tree.
 *
 *=========================================================================*/
#ifndef itkVectorConnectedComponentImageFilter_h
#define itkVectorConnectedComponentImageFilter_h
 
#include "itkMath.h"
#include "itkNumericTraits.h"
#include "itkConnectedComponentFunctorImageFilter.h"
 
namespace itk
{
namespace Functor
{
 
template <typename TInput>
class SimilarVectorsFunctor
{
public:
  SimilarVectorsFunctor() = default;
 
  ~SimilarVectorsFunctor() = default;
 
  void
  SetDistanceThreshold(const typename TInput::ValueType & thresh)
  {
    m_Threshold = thresh;
  }
  typename TInput::ValueType
  GetDistanceThreshold()
  {
    return (m_Threshold);
  }
 
  bool
  operator==(const SimilarVectorsFunctor &) const
  {
    return true;
  }
 
  ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(SimilarVectorsFunctor);
 
  bool
  operator()(const TInput & a, const TInput & b) const
  {
    using RealValueType = typename NumericTraits<typename TInput::ValueType>::RealType;
    RealValueType dotProduct{};
    for (unsigned int i = 0; i < NumericTraits<TInput>::GetLength(a); ++i)
    {
      dotProduct += a[i] * b[i];
    }
    return (static_cast<typename TInput::ValueType>(1.0 - itk::Math::abs(dotProduct)) <= m_Threshold);
  }
 
protected:
  typename TInput::ValueType m_Threshold{};
};
} // end namespace Functor

template <typename TInputImage, typename TOutputImage, typename TMaskImage = TInputImage>
class VectorConnectedComponentImageFilter
  : public ConnectedComponentFunctorImageFilter<TInputImage,
                                                TOutputImage,
                                                Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
                                                TMaskImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VectorConnectedComponentImageFilter);

  using Self = VectorConnectedComponentImageFilter;
  using Superclass =
    ConnectedComponentFunctorImageFilter<TInputImage,
                                         TOutputImage,
                                         Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
                                         TMaskImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(VectorConnectedComponentImageFilter);
 
  using InputValueType = typename TInputImage::PixelType::ValueType;
 
  virtual void
  SetDistanceThreshold(const InputValueType & thresh)
  {
    this->GetFunctor().SetDistanceThreshold(thresh);
  }
 
  virtual InputValueType
  GetDistanceThreshold()
  {
    return (this->GetFunctor().GetDistanceThreshold());
  }
 
  itkConceptMacro(InputValueHasNumericTraitsCheck, (Concept::HasNumericTraits<InputValueType>));
  itkConceptMacro(InputValyeTypeIsFloatingCheck, (Concept::IsFloatingPoint<InputValueType>));
 
protected:
  VectorConnectedComponentImageFilter() = default;
  ~VectorConnectedComponentImageFilter() override = default;
};
} // end namespace itk
 
#endif