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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 "itkUnaryGeneratorImageFilter.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:
using ComponentType = typename TInput::ComponentType;
using RealType = typename itk::NumericTraits<ComponentType>::RealType;
bool
operator==(const RGBToLuminance &) const
{
return true;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(RGBToLuminance);
inline TOutput
operator()(const TInput & A) const
{
return static_cast<TOutput>(A.GetLuminance());
}
};
} // namespace Functor
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT RGBToLuminanceImageFilter : public UnaryGeneratorImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(RGBToLuminanceImageFilter);
/** Standard class type aliases. */
using Self = RGBToLuminanceImageFilter;
using Superclass = UnaryGeneratorImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using FunctorType = Functor::RGBToLuminance<typename TInputImage::PixelType, typename TOutputImage::PixelType>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(RGBToLuminanceImageFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<typename TInputImage::PixelType::ComponentType>));
// End concept checking
#endif
protected:
RGBToLuminanceImageFilter()
{
#if !defined(ITK_WRAPPING_PARSER)
Superclass::SetFunctor(FunctorType());
#endif
}
~RGBToLuminanceImageFilter() override = default;
};
} // end namespace itk
#endif
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