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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 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
*
* \wiki
* \wikiexample{Smoothing/MedianImageFilter,Median filter an image}
* \wikiexample{Smoothing/RGBMedianImageFilter,Median filter an RGB image}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT MedianImageFilter:
public BoxImageFilter< TInputImage, TOutputImage >
{
public:
/** Extract dimension from input and output image. */
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** Convenient typedefs for simplifying declarations. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
/** Standard class typedefs. */
typedef MedianImageFilter Self;
typedef ImageToImageFilter< InputImageType, OutputImageType > 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(MedianImageFilter, BoxImageFilter);
/** Image typedef support. */
typedef typename InputImageType::PixelType InputPixelType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename InputImageType::RegionType InputImageRegionType;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename InputImageType::SizeType InputSizeType;
#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();
virtual ~MedianImageFilter() ITK_OVERRIDE {}
/** 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 ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId) ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(MedianImageFilter);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMedianImageFilter.hxx"
#endif
#endif
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