itkRGBToLuminanceImageFilter.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkRGBToLuminanceImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2008-10-17 16:30:50 $
  Version:   $Revision: 1.6 $

  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 __itkRGBToLuminanceImageFilter_h
#define __itkRGBToLuminanceImageFilter_h

#include "itkUnaryFunctorImageFilter.h"

namespace itk
{
  
namespace Function {  
  
template< class TInput, class TOutput>
class RGBToLuminance
{
public:
  typedef typename TInput::ComponentType                         ComponentType;
  typedef typename itk::NumericTraits< ComponentType >::RealType RealType;

  RGBToLuminance() {}
  ~RGBToLuminance() {}
  bool operator!=( const RGBToLuminance & ) const
    {
    return false;
    }
  bool operator==( const RGBToLuminance & other ) const
    {
    return !(*this != other);
    }
  inline TOutput operator()( const TInput & A )
    { return static_cast<TOutput>( A.GetLuminance() ); }
}; 
}

template <class TInputImage, class TOutputImage>
class ITK_EXPORT RGBToLuminanceImageFilter :
    public
UnaryFunctorImageFilter<TInputImage,TOutputImage, 
                        Function::RGBToLuminance< 
  typename TInputImage::PixelType, 
  typename TOutputImage::PixelType>   >
{
public:
  typedef RGBToLuminanceImageFilter                               Self;
  typedef UnaryFunctorImageFilter<
    TInputImage,TOutputImage, 
    Function::RGBToLuminance<typename TInputImage::PixelType, 
                             typename TOutputImage::PixelType> >  Superclass;
  typedef SmartPointer<Self>                                      Pointer;
  typedef SmartPointer<const Self>                                ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(RGBToLuminanceImageFilter, 
               UnaryFunctorImageFilter);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro(InputHasNumericTraitsCheck,
    (Concept::HasNumericTraits<typename TInputImage::PixelType::ComponentType>));

#endif

protected:
  RGBToLuminanceImageFilter() {}
  virtual ~RGBToLuminanceImageFilter() {}

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

};

} // end namespace itk


#endif