itkThresholdLabelerImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkThresholdLabelerImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2004/03/05 15:14:27 $
  Version:   $Revision: 1.3 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.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 __itkThresholdLabelerImageFilter_h
#define __itkThresholdLabelerImageFilter_h

#include "itkUnaryFunctorImageFilter.h"
#include "itkConceptChecking.h"

namespace itk
{
  
namespace Functor {  
  
template< class TInput, class TOutput >
class ThresholdLabeler
{
public:
  ThresholdLabeler() { m_LabelOffset = NumericTraits<TOutput>::One; }
  ~ThresholdLabeler() {};

  typedef std::vector<TInput> ThresholdVector;

  void SetThresholds( const ThresholdVector & thresholds )
    { m_Thresholds = thresholds; }

  void SetLabelOffset( const TOutput & labelOffset )
    { m_LabelOffset = labelOffset; }

  inline TOutput operator()( const TInput & A )
    {
    unsigned int size = m_Thresholds.size();
    if (size == 0)
      {
      return m_LabelOffset;
      }
    if (A <= m_Thresholds[0])
      {
      return m_LabelOffset;
      }
    for (unsigned int i=0; i<size-1; i++)
      {
      /* Value is in this class if it equals the upper bound. */
      if (m_Thresholds[i] < A && A <= m_Thresholds[i+1])
        {
        return static_cast<TOutput>(i+1) + m_LabelOffset;
        }
      }
    return static_cast<TOutput>(size) + m_LabelOffset;
    }

private:

  ThresholdVector m_Thresholds;
  TOutput m_LabelOffset;
};
}

template <class TInputImage,class TOutputImage>
class ThresholdLabelerImageFilter :
    public
UnaryFunctorImageFilter<TInputImage,TOutputImage, 
                        Functor::ThresholdLabeler< 
  typename TInputImage::PixelType,
  typename TOutputImage::PixelType> >
{
public:
  typedef ThresholdLabelerImageFilter  Self;
  typedef UnaryFunctorImageFilter<TInputImage,TOutputImage, 
                                  Functor::ThresholdLabeler< 
    typename TInputImage::PixelType,
    typename TOutputImage::PixelType>   
  >  Superclass;
  typedef SmartPointer<Self>   Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(ThresholdLabelerImageFilter, UnaryFunctorImageFilter);

  typedef typename TInputImage::PixelType  InputPixelType;
  typedef typename TOutputImage::PixelType  OutputPixelType;

  typedef std::vector<InputPixelType> ThresholdVector;

  itkConceptMacro(PixelTypeComparable, (Concept::Comparable<InputPixelType>));

  void SetThresholds( const ThresholdVector & thresholds )
  { m_Thresholds = thresholds; }
  const ThresholdVector & GetThresholds()
  { return m_Thresholds; }

  itkSetClampMacro(LabelOffset,OutputPixelType, NumericTraits<OutputPixelType>::Zero,NumericTraits<OutputPixelType>::max() );
  itkGetMacro(LabelOffset,OutputPixelType);

protected:
  ThresholdLabelerImageFilter();
  virtual ~ThresholdLabelerImageFilter() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void BeforeThreadedGenerateData();

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

  ThresholdVector m_Thresholds;
  OutputPixelType m_LabelOffset;
};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkThresholdLabelerImageFilter.txx"
#endif

#endif

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