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itkRGBToLuminanceImageAdaptor.h
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itkRGBToLuminanceImageAdaptor.h
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkRGBToLuminanceImageAdaptor.h
Language: C++
Date: $Date$
Version: $Revision$
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 {
/** \class RGBToLuminancePixelAccessor
* \brief Give access to Luminance of a color pixel type.
*
* RGBToLuminancePixelAccessor is templated over an internal type and an
* external type representation. This class cast the input applies the function
* to it and cast the result according to the types defined as template
* parameters. The input pixel type must support the GetLuminance() method.
* This is the case of the RGBPixel class for example.
*
* \ingroup ImageAdaptors
*/
template <class TInternalType, class TExternalType >
class ITK_EXPORT RGBToLuminancePixelAccessor
{
public:
/** External typedef. It defines the external aspect
* that this class will exhibit. */
typedef TExternalType ExternalType;
/** Internal typedef. It defines the internal real
* representation of data. */
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
/** \class RGBToLuminanceImageAdaptor
* \brief Presents a color image as being composed of the Luminance of its pixels.
*
* Additional casting is performed according to the input and output image
* types following C++ default casting rules. The input color pixel type must
* provide a GetLuminance() method.
*
* \ingroup ImageAdaptors
*/
template <class TImage, class TOutputPixelType>
class ITK_EXPORT RGBToLuminanceImageAdaptor : public
ImageAdaptor<TImage,
Accessor::RGBToLuminancePixelAccessor<
typename TImage::PixelType,
TOutputPixelType> >
{
public:
/** Standard class typedefs. */
typedef RGBToLuminanceImageAdaptor Self;
typedef ImageAdaptor<TImage, Accessor::RGBToLuminancePixelAccessor<
typename TImage::PixelType,
TOutputPixelType> > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
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