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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkVectorConnectedComponentImageFilter.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 __itkVectorConnectedComponentImageFilter_h
#define __itkVectorConnectedComponentImageFilter_h
#include "vnl/vnl_math.h"
#include "itkNumericTraits.h"
#include "itkConnectedComponentFunctorImageFilter.h"
namespace itk
{
namespace Functor
{
/** \class SimilarVectorsFunctor
*
* \brief A connected components filter that labels the
* objects in a vector image. Two vectors are pointing
* similar directions if one minus their dot product is less than a
* threshold. Vectors that are 180 degrees out of phase
* are similar. Assumes that vectors are normalized.
*/
template<class TInput>
class SimilarVectorsFunctor
{
public:
SimilarVectorsFunctor()
{m_Threshold = itk::NumericTraits<ITK_TYPENAME TInput::ValueType>::Zero;}
~SimilarVectorsFunctor() {};
void SetDistanceThreshold(const typename TInput::ValueType &thresh)
{m_Threshold = thresh;}
typename TInput::ValueType GetDistanceThreshold() {return (m_Threshold);}
bool operator!=( const SimilarVectorsFunctor & ) const
{
return false;
}
bool operator==( const SimilarVectorsFunctor & other ) const
{
return !(*this != other);
}
bool operator()(const TInput &a, const TInput &b) const
{
typename TInput::ValueType dotProduct = vnl_math_abs(a * b);
return (1.0 - dotProduct <= m_Threshold);
}
protected:
typename TInput::ValueType m_Threshold;
};
} // end namespace Functor
/** \class VectorConnectedComponentImageFilter
*
* \brief A connected components filter that labels the
* objects in a vector image. Two vectors are pointing
* similar directions if one minus their dot product is less than a
* threshold. Vectors that are 180 degrees out of phase
* are similar. Assumes that vectors are normalized.
*/
template <class TInputImage, class TOutputImage, class TMaskImage=TInputImage>
class ITK_EXPORT VectorConnectedComponentImageFilter :
public ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage,
Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
TMaskImage>
{
public:
/** Standard class typedefs. */
typedef VectorConnectedComponentImageFilter Self;
typedef ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage,
Functor::SimilarVectorsFunctor<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(VectorConnectedComponentImageFilter,ConnectedComponentFunctorImageFilter);
typedef typename TInputImage::PixelType::ValueType InputValueType;
virtual void SetDistanceThreshold(const InputValueType& thresh)
{this->GetFunctor().SetDistanceThreshold(thresh);}
virtual InputValueType GetDistanceThreshold()
{return (this->GetFunctor().GetDistanceThreshold());}
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<InputValueType>));
/** End concept checking */
#endif
protected:
VectorConnectedComponentImageFilter() {};
virtual ~VectorConnectedComponentImageFilter() {};
private:
VectorConnectedComponentImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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