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/*
* Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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
*
* 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 otbVarianceImageFilter_h
#define otbVarianceImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkNumericTraits.h"
namespace otb
{
/** \class VarianceImageFilter
* \brief Applies an averaging filter to an image
*
* Computes an image where a given pixel is the value over the standard 8, 26, etc. connected
* neighborhood. This calculation uses a ZeroFluxNeumannBoundaryCondition.
*
*
* \sa Image
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
*
* \ingroup IntensityImageFilters
*
* \ingroup OTBStatistics
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT VarianceImageFilter : public itk::ImageToImageFilter<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 VarianceImageFilter Self;
typedef itk::ImageToImageFilter<InputImageType, OutputImageType> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(VarianceImageFilter, ImageToImageFilter);
/** Image typedef support. */
typedef typename InputImageType::PixelType InputPixelType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename itk::NumericTraits<InputPixelType>::RealType InputRealType;
typedef typename InputImageType::RegionType InputImageRegionType;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename InputImageType::SizeType InputSizeType;
/** Set the radius of the neighborhood used to compute the mean. */
itkSetMacro(Radius, InputSizeType);
/** Get the radius of the neighborhood used to compute the mean */
itkGetConstReferenceMacro(Radius, InputSizeType);
/** VarianceImageFilter needs a larger input requested region than
* the output requested region. As such, VarianceImageFilter needs
* to provide an implementation for GenerateInputRequestedRegion()
* in order to inform the pipeline execution model.
*
* \sa ImageToImageFilter::GenerateInputRequestedRegion() */
void GenerateInputRequestedRegion() override;
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck, (itk::Concept::HasNumericTraits<InputPixelType>));
/** End concept checking */
#endif
protected:
VarianceImageFilter();
~VarianceImageFilter() override
{
}
void PrintSelf(std::ostream& os, itk::Indent indent) const override;
/** VarianceImageFilter 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, itk::ThreadIdType threadId) override;
private:
VarianceImageFilter(const Self&) = delete;
void operator=(const Self&) = delete;
InputSizeType m_Radius;
};
} // end namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbVarianceImageFilter.hxx"
#endif
#endif
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