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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 itkScalarConnectedComponentImageFilter_h
#define itkScalarConnectedComponentImageFilter_h
#include "itkMath.h"
#include "itkNumericTraits.h"
#include "itkConnectedComponentFunctorImageFilter.h"
namespace itk
{
/**
* \class ScalarConnectedComponentImageFilter
*
* \brief A connected components filter that labels the
* objects in an arbitrary image. Two pixels are
* similar if they are within threshold of each other.
* Uses ConnectedComponentFunctorImageFilter.
* \ingroup ITKConnectedComponents
*
* \sphinx
* \sphinxexample{Segmentation/ConnectedComponents/LabelConnectComponentsInGrayscaleImage,Label Connect Components In
* Grayscale Image} \endsphinx
*/
namespace Functor
{
template <typename TInput>
class SimilarPixelsFunctor
{
public:
SimilarPixelsFunctor() { m_Threshold = TInput{}; }
~SimilarPixelsFunctor() = default;
bool
operator==(const SimilarPixelsFunctor & other) const
{
return m_Threshold == other.m_Threshold;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(SimilarPixelsFunctor);
void
SetDistanceThreshold(const TInput & thresh)
{
m_Threshold = thresh;
}
TInput
GetDistanceThreshold()
{
return (m_Threshold);
}
bool
operator()(const TInput & a, const TInput & b) const
{
using InputRealType = typename NumericTraits<TInput>::RealType;
auto absDifference =
static_cast<TInput>(itk::Math::abs(static_cast<InputRealType>(a) - static_cast<InputRealType>(b)));
if (absDifference <= m_Threshold)
{
return true;
}
else
{
return false;
}
}
protected:
TInput m_Threshold;
};
} // end namespace Functor
template <typename TInputImage, typename TOutputImage, typename TMaskImage = TInputImage>
class ScalarConnectedComponentImageFilter
: public ConnectedComponentFunctorImageFilter<TInputImage,
TOutputImage,
Functor::SimilarPixelsFunctor<typename TInputImage::ValueType>,
TMaskImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ScalarConnectedComponentImageFilter);
/** Standard class type aliases. */
using Self = ScalarConnectedComponentImageFilter;
using Superclass =
ConnectedComponentFunctorImageFilter<TInputImage,
TOutputImage,
Functor::SimilarPixelsFunctor<typename TInputImage::ValueType>,
TMaskImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ScalarConnectedComponentImageFilter);
using InputPixelType = typename TInputImage::PixelType;
virtual void
SetDistanceThreshold(const InputPixelType & thresh)
{
this->GetFunctor().SetDistanceThreshold(thresh);
}
virtual InputPixelType
GetDistanceThreshold()
{
return (this->GetFunctor().GetDistanceThreshold());
}
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputEqualityComparableCheck, (Concept::EqualityComparable<InputPixelType>));
itkConceptMacro(OutputEqualityComparableCheck, (Concept::EqualityComparable<typename TOutputImage::PixelType>));
itkConceptMacro(MaskEqualityComparableCheck, (Concept::EqualityComparable<typename TMaskImage::PixelType>));
itkConceptMacro(OutputIncrementDecrementOperatorsCheck,
(Concept::IncrementDecrementOperators<typename TOutputImage::PixelType>));
// End concept checking
#endif
protected:
ScalarConnectedComponentImageFilter() = default;
~ScalarConnectedComponentImageFilter() override = default;
};
} // end namespace itk
#endif
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