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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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
*
* \wiki
* \wikiexample{ImageProcessing/ScalarConnectedComponentImageFilter,Label connected components in a grayscale image}
* \endwiki
*/
namespace Functor
{
template< typename TInput >
class SimilarPixelsFunctor
{
public:
SimilarPixelsFunctor()
{
m_Threshold = NumericTraits< TInput >::ZeroValue();
}
~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 >( 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:
/** 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() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(ScalarConnectedComponentImageFilter);
};
} // end namespace itk
#endif
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