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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 itkRGBToLuminanceImageAdaptor_h
#define itkRGBToLuminanceImageAdaptor_h
#include "itkImageAdaptor.h"
#include "itkMath.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
* \ingroup ITKImageAdaptors
*/
template< typename TInternalType, typename TExternalType >
class 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
* \ingroup ITKImageAdaptors
*/
template< typename TImage, typename TOutputPixelType >
class 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() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(RGBToLuminanceImageAdaptor);
};
} // end namespace itk
#endif
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