itkFastApproximateRankImageFilter.h

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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 itkFastApproximateRankImageFilter_h
#define itkFastApproximateRankImageFilter_h

#include "itkMiniPipelineSeparableImageFilter.h"
#include "itkRankImageFilter.h"

namespace itk
{
template< typename TInputImage, typename TOutputImage >
class FastApproximateRankImageFilter:
  public MiniPipelineSeparableImageFilter< TInputImage, TOutputImage,
                                           RankImageFilter< TInputImage, TInputImage,
                                                            FlatStructuringElement< TInputImage::ImageDimension > > >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(FastApproximateRankImageFilter);

  using Self = FastApproximateRankImageFilter;
  using Superclass = MiniPipelineSeparableImageFilter< TInputImage, TOutputImage,
          RankImageFilter< TInputImage, TInputImage,
                      FlatStructuringElement< TInputImage::ImageDimension > > >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(FastApproximateRankImageFilter, MiniPipelineSeparableImageFilter);

  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 FilterType = typename Superclass::FilterType;

  static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;

  using RadiusType = typename TInputImage::SizeType;

  void SetRank(float rank)
  {
    if ( m_Rank != rank )
      {
      m_Rank = rank;
      for ( unsigned 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 {}

  void PrintSelf(std::ostream & os, Indent indent) const override
  {
    Superclass::PrintSelf(os, indent);
    os << indent << "Rank: " << m_Rank << std::endl;
  }

private:
  float m_Rank;
};
}

#endif