itkRGBToLuminanceImageAdaptor.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkRGBToLuminanceImageAdaptor.h,v $
  Language:  C++
  Date:      $Date: 2009-09-19 19:56:20 $
  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 __itkRGBToLuminanceImageAdaptor_h
#define __itkRGBToLuminanceImageAdaptor_h

#include <itkImageAdaptor.h>
#include "vnl/vnl_math.h"

namespace itk
{
 
namespace Accessor {
template <class TInternalType, class TExternalType >
class ITK_EXPORT RGBToLuminancePixelAccessor  
{
public:
  typedef TExternalType ExternalType;

  typedef TInternalType InternalType;

  static inline void Set(TInternalType & output, const TExternalType & input) 
    {output = static_cast<TInternalType>( input.GetLuminance() );}

  static inline TExternalType Get( const TInternalType & input ) 
    {return static_cast<TExternalType>( input.GetLuminance() );}
};
  
} // end namespace Accessor
 
template <class TImage, class TOutputPixelType>
class ITK_EXPORT RGBToLuminanceImageAdaptor : public
      ImageAdaptor<TImage,
                   Accessor::RGBToLuminancePixelAccessor<
                                      typename TImage::PixelType,
                                      TOutputPixelType>   >
{
public:
  typedef RGBToLuminanceImageAdaptor                Self;
  typedef ImageAdaptor<TImage, Accessor::RGBToLuminancePixelAccessor<
                               typename TImage::PixelType,
                               TOutputPixelType> >  Superclass;
  typedef SmartPointer<Self>                        Pointer;
  typedef SmartPointer<const Self>                  ConstPointer;

  itkNewMacro(Self);  

  itkTypeMacro( RGBToLuminanceImageAdaptor, ImageAdaptor );

protected:
  RGBToLuminanceImageAdaptor() {}
  virtual ~RGBToLuminanceImageAdaptor() {}
  
private:
  RGBToLuminanceImageAdaptor(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

};

} // end namespace itk

#endif