itkBinaryThresholdImageFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkBinaryThresholdImageFunction.h,v $
  Language:  C++
  Date:      $Date: 2004/12/12 22:07:23 $
  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.

     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 _itkBinaryThresholdImageFunction_h
#define _itkBinaryThresholdImageFunction_h

#include "itkImageFunction.h"

namespace itk
{

template <class TInputImage, class TCoordRep = float>
class ITK_EXPORT BinaryThresholdImageFunction : 
  public ImageFunction<TInputImage,bool,TCoordRep> 
{
public:
  typedef BinaryThresholdImageFunction Self;
  typedef ImageFunction<TInputImage,bool,TCoordRep> Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self>  ConstPointer;
  
  itkTypeMacro(BinaryThresholdImageFunction, ImageFunction);

  itkNewMacro(Self);

  typedef typename Superclass::InputImageType InputImageType;
  
  typedef typename TInputImage::PixelType PixelType;

  itkStaticConstMacro(ImageDimension, unsigned int,Superclass::ImageDimension);

  typedef typename Superclass::PointType PointType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  virtual bool Evaluate( const PointType& point ) const
    {
    IndexType index;
    this->ConvertPointToNearestIndex( point, index );
    return ( this->EvaluateAtIndex( index ) );
    }

  virtual bool EvaluateAtContinuousIndex( 
    const ContinuousIndexType & index ) const
    {
      IndexType nindex;

      this->ConvertContinuousIndexToNearestIndex (index, nindex);
      return this->EvaluateAtIndex(nindex);
    }

  virtual bool EvaluateAtIndex( const IndexType & index ) const
    {
    PixelType value = this->GetInputImage()->GetPixel(index);
    return ( m_Lower <= value && value <= m_Upper);
    }

  itkGetConstReferenceMacro(Lower,PixelType);

  itkGetConstReferenceMacro(Upper,PixelType);

  void ThresholdAbove(PixelType thresh);
  
  void ThresholdBelow(PixelType thresh);

  void ThresholdBetween(PixelType lower, PixelType upper);

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

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

  PixelType m_Lower;
  PixelType m_Upper;
};

} // namespace itk

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

#endif

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