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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkRGBToLuminanceImageFilter_h
#define itkRGBToLuminanceImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
/** \class RGBToLuminanceImageFilter
* \brief Converts an RGB image into a grayscale image.
*
* This filters converts an RGB image into a Luminance on by computing
* pixel-wise a linear combination on the Red, Green and Blue channels. The
* pixel type of the input image must have a GetLuminance() method. This is the
* case of the itk::RGBPixel class.
*
* \ingroup IntensityImageFilters MultiThreaded
* \ingroup ITKImageIntensity
*/
namespace Functor
{
template< typename TInput, typename 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) const
{ return static_cast< TOutput >( A.GetLuminance() ); }
};
}
template< typename TInputImage, typename TOutputImage >
class RGBToLuminanceImageFilter:
public
UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::RGBToLuminance<
typename TInputImage::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef RGBToLuminanceImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage, TOutputImage,
Functor::RGBToLuminance< typename TInputImage::PixelType,
typename TOutputImage::PixelType > > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(RGBToLuminanceImageFilter,
UnaryFunctorImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< typename TInputImage::PixelType::ComponentType > ) );
// End concept checking
#endif
protected:
RGBToLuminanceImageFilter() {}
virtual ~RGBToLuminanceImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(RGBToLuminanceImageFilter);
};
} // end namespace itk
#endif
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