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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 itkFastApproximateRankImageFilter_h
#define itkFastApproximateRankImageFilter_h
#include "itkMiniPipelineSeparableImageFilter.h"
#include "itkRankImageFilter.h"
namespace itk
{
/**
* \class FastApproximateRankImageFilter
* \brief A separable rank filter
*
* Medians aren't separable, but if you want a large robust smoother
* to be relatively quick then it is worthwhile pretending that they
* are.
*
* This code was contributed in the Insight Journal paper:
* "Efficient implementation of kernel filtering"
* by Beare R., Lehmann G
* https://www.insight-journal.org/browse/publication/160
*
* \author Richard Beare
* \ingroup ITKReview
*/
template <typename TInputImage, typename TOutputImage>
class FastApproximateRankImageFilter
: public MiniPipelineSeparableImageFilter<
TInputImage,
TOutputImage,
RankImageFilter<TInputImage, TInputImage, FlatStructuringElement<TInputImage::ImageDimension>>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(FastApproximateRankImageFilter);
/** Standard class type aliases. */
using Self = FastApproximateRankImageFilter;
using Superclass = MiniPipelineSeparableImageFilter<
TInputImage,
TOutputImage,
RankImageFilter<TInputImage, TInputImage, FlatStructuringElement<TInputImage::ImageDimension>>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Standard New method. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(FastApproximateRankImageFilter);
/** Image related type alias. */
using InputImageType = TInputImage;
using RegionType = typename TInputImage::RegionType;
using SizeType = typename TInputImage::SizeType;
using IndexType = typename TInputImage::IndexType;
using PixelType = typename TInputImage::PixelType;
using OffsetType = typename TInputImage::OffsetType;
using typename Superclass::FilterType;
/** Image related type alias. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** n-dimensional Kernel radius. */
using RadiusType = typename TInputImage::SizeType;
void
SetRank(float rank)
{
if (m_Rank != rank)
{
m_Rank = rank;
for (unsigned int i = 0; i < TInputImage::ImageDimension - 1; ++i)
{
this->m_Filters[i]->SetRank(m_Rank);
}
this->Modified();
}
}
itkGetConstMacro(Rank, float);
protected:
FastApproximateRankImageFilter()
{
// to avoid valgrind warning
m_Rank = 0.0;
this->SetRank(0.5);
}
~FastApproximateRankImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override
{
Superclass::PrintSelf(os, indent);
os << indent << "Rank: " << m_Rank << std::endl;
}
private:
float m_Rank{};
};
} // namespace itk
#endif
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