itkVectorConnectedComponentImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkVectorConnectedComponentImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-17 16:30:53 $
  Version:   $Revision: 1.8 $

  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 {  
  
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)
    {
    typename TInput::ValueType dotProduct = vnl_math_abs(a * b);
    return (1.0 - dotProduct <= m_Threshold);
    }

protected:
  typename TInput::ValueType m_Threshold;
                            
};

} // end namespace Functor 

template <class TInputImage, class TOutputImage, class TMaskImage=TInputImage>
class ITK_EXPORT VectorConnectedComponentImageFilter :
    public ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage,
             Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
                                           TMaskImage> 
{
public:
  typedef VectorConnectedComponentImageFilter Self;
  typedef ConnectedComponentFunctorImageFilter<TInputImage,TOutputImage, 
             Functor::SimilarVectorsFunctor<typename TInputImage::ValueType>,
             TMaskImage>                      Superclass;
  typedef SmartPointer<Self>                  Pointer;
  typedef SmartPointer<const Self>            ConstPointer;

  itkNewMacro(Self);

  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

  itkConceptMacro(InputHasNumericTraitsCheck,
                  (Concept::HasNumericTraits<InputValueType>));

#endif

protected:
  VectorConnectedComponentImageFilter() {};
  virtual ~VectorConnectedComponentImageFilter() {};

private:
  VectorConnectedComponentImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};

} // end namespace itk

#endif