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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 itkMedianImageFilter_h
#define itkMedianImageFilter_h
#include "itkBoxImageFilter.h"
#include "itkImage.h"
namespace itk
{
/**
* \class MedianImageFilter
* \brief Applies a median filter to an image
*
* Computes an image where a given pixel is the median value of the
* the pixels in a neighborhood about the corresponding input pixel.
*
* A median filter is one of the family of nonlinear filters. It is
* used to smooth an image without being biased by outliers or shot noise.
*
* This filter requires that the input pixel type provides an operator<()
* (LessThan Comparable).
*
* \sa Image
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
*
* \ingroup IntensityImageFilters
* \ingroup ITKSmoothing
*
* \sphinx
* \sphinxexample{Filtering/Smoothing/ApplyMedianFilter,Median Filter Of An Image}
* \sphinxexample{Filtering/Smoothing/MedianFilteringOfAnRGBImage,Median Filter Of An RGB Image}
* \endsphinx
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT MedianImageFilter : public BoxImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(MedianImageFilter);
/** Extract dimension from input and output image. */
static constexpr unsigned int InputImageDimension = TInputImage::ImageDimension;
static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
/** Convenient type alias for simplifying declarations. */
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
/** Standard class type aliases. */
using Self = MedianImageFilter;
using Superclass = ImageToImageFilter<InputImageType, OutputImageType>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(MedianImageFilter);
/** Image type alias support */
using InputPixelType = typename InputImageType::PixelType;
using OutputPixelType = typename OutputImageType::PixelType;
using InputImageRegionType = typename InputImageType::RegionType;
using OutputImageRegionType = typename OutputImageType::RegionType;
using InputSizeType = typename InputImageType::SizeType;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<InputImageDimension, OutputImageDimension>));
itkConceptMacro(InputConvertibleToOutputCheck, (Concept::Convertible<InputPixelType, OutputPixelType>));
itkConceptMacro(InputLessThanComparableCheck, (Concept::LessThanComparable<InputPixelType>));
// End concept checking
#endif
protected:
MedianImageFilter();
~MedianImageFilter() override = default;
/** MedianImageFilter can be implemented as a multithreaded filter.
* Therefore, this implementation provides a ThreadedGenerateData()
* routine which is called for each processing thread. The output
* image data is allocated automatically by the superclass prior to
* calling ThreadedGenerateData(). ThreadedGenerateData can only
* write to the portion of the output image specified by the
* parameter "outputRegionForThread"
*
* \sa ImageToImageFilter::ThreadedGenerateData(),
* ImageToImageFilter::GenerateData() */
void
DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkMedianImageFilter.hxx"
#endif
#endif
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