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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkScalarConnectedComponentImageFilter.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkScalarConnectedComponentImageFilter_h
#define __itkScalarConnectedComponentImageFilter_h
#include "vnl/vnl_math.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.
*/
namespace Functor {
template<class TInput>
class SimilarPixelsFunctor
{
public:
SimilarPixelsFunctor()
{
m_Threshold = NumericTraits<TInput>::Zero;
}
~SimilarPixelsFunctor()
{
}
bool operator!=( const SimilarPixelsFunctor & other ) const
{
if( m_Threshold != other.m_Threshold )
{
return true;
}
return false;
}
bool operator==( const SimilarPixelsFunctor & other ) const
{
return !(*this != other);
}
void SetDistanceThreshold(const TInput &thresh)
{
m_Threshold = thresh;
}
TInput GetDistanceThreshold()
{
return (m_Threshold);
}
bool operator()(const TInput &a, const TInput &b) const
{
typedef typename NumericTraits<TInput>::RealType InputRealType;
TInput absDifference = static_cast<TInput>( vnl_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 <class TInputImage, class TOutputImage, class TMaskImage=TInputImage>
class ITK_EXPORT ScalarConnectedComponentImageFilter :
public ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage,
Functor::SimilarPixelsFunctor<typename TInputImage::ValueType>,
TMaskImage>
{
public:
/** Standard class typedefs. */
typedef ScalarConnectedComponentImageFilter Self;
typedef ConnectedComponentFunctorImageFilter<
TInputImage,TOutputImage,
Functor::SimilarPixelsFunctor<typename TInputImage::ValueType>,
TMaskImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ScalarConnectedComponentImageFilter,ConnectedComponentFunctorImageFilter);
typedef typename TInputImage::PixelType InputPixelType;
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() {};
virtual ~ScalarConnectedComponentImageFilter() {};
private:
ScalarConnectedComponentImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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