itkAttributeMorphologyBaseImageFilter.h

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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
 *
 *         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 itkAttributeMorphologyBaseImageFilter_h
#define itkAttributeMorphologyBaseImageFilter_h
 
#include "itkImageToImageFilter.h"
#include <vector>
 
#define PAMI
 
namespace itk
{
template <typename TInputImage, typename TOutputImage, typename TAttribute, typename TFunction>
class ITK_TEMPLATE_EXPORT AttributeMorphologyBaseImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  using Self = AttributeMorphologyBaseImageFilter;
  using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
 
  using InputImagePointer = typename Superclass::InputImagePointer;
 
  using OutputPixelType = typename TOutputImage::PixelType;
  using OutputInternalPixelType = typename TOutputImage::InternalPixelType;
  using InputPixelType = typename TInputImage::PixelType;
  using InputInternalPixelType = typename TInputImage::InternalPixelType;
  using IndexType = typename TInputImage::IndexType;
  using OffsetType = typename TInputImage::OffsetType;
  using SizeType = typename TInputImage::SizeType;
 
  static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
 
  using InputImageType = TInputImage;
  using OutputImageType = TOutputImage;
  //   using IndexType = typename TInputImage::IndexType;
  //   using SizeType = typename TInputImage::SizeType;
  using RegionType = typename TOutputImage::RegionType;
  using ListType = std::list<IndexType>;
  using AttributeType = TAttribute;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkTypeMacro(AttributeMorphologyBaseImageFilter, ImageToImageFilter);
 
  itkNewMacro(Self);
 
  itkSetMacro(FullyConnected, bool);
  itkGetConstReferenceMacro(FullyConnected, bool);
  itkBooleanMacro(FullyConnected);
 
  itkSetMacro(Lambda, AttributeType);
  itkGetConstMacro(Lambda, AttributeType);
 
protected:
  AttributeMorphologyBaseImageFilter()
  {
    m_FullyConnected = false;
    m_AttributeValuePerPixel = 1;
    m_Lambda = 0;
  }
 
  ~AttributeMorphologyBaseImageFilter() override = default;
  AttributeMorphologyBaseImageFilter(const Self &) {}
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  GenerateData() override;
 
  void
  GenerateInputRequestedRegion() override;
 
  void
  EnlargeOutputRequestedRegion(DataObject * itkNotUsed(output)) override;
 
  AttributeType m_AttributeValuePerPixel;
 
private:
  bool          m_FullyConnected;
  AttributeType m_Lambda;
 
  // some constants used several times in the code
  static constexpr OffsetValueType INACTIVE = -1;
  static constexpr OffsetValueType ACTIVE = -2;
  static constexpr OffsetValueType ROOT = -3;
 
  // Just used for area/volume openings at the moment
  AttributeType * m_AuxData;
 
  using OffsetVecType = std::vector<OffsetType>;
  // offset in the linear array.
  using OffsetDirectVecType = std::vector<OffsetValueType>;
 
  void
  SetupOffsetVec(OffsetDirectVecType & PosOffsets, OffsetVecType & Offsets);
 
  class GreyAndPos
  {
  public:
    InputPixelType  Val;
    OffsetValueType Pos;
  };
 
  GreyAndPos *      m_SortPixels;
  OffsetValueType * m_Parent;
#ifndef PAMI
  bool * m_Processed;
#endif
  // This is a bit ugly, but I can't see an easy way around
  InputPixelType * m_Raw;
 
  class ComparePixStruct
  {
  public:
    TFunction m_TFunction;
    bool
    operator()(GreyAndPos const & l, GreyAndPos const & r) const
    {
      if (m_TFunction(l.Val, r.Val))
      {
        return true;
      }
      if (l.Val == r.Val)
      {
        return (l.Pos < r.Pos);
      }
      return false;
    }
  };
 
#ifdef PAMI
  // version from PAMI. Note - using the AuxData array rather than the
  // parent array to store area
  void
  MakeSet(OffsetValueType x)
  {
    m_Parent[x] = ACTIVE;
    m_AuxData[x] = m_AttributeValuePerPixel;
  }
 
  OffsetValueType
  FindRoot(OffsetValueType x)
  {
    if (m_Parent[x] >= 0)
    {
      m_Parent[x] = FindRoot(m_Parent[x]);
      return (m_Parent[x]);
    }
    else
    {
      return (x);
    }
  }
 
  bool
  Criterion(OffsetValueType x, OffsetValueType y)
  {
    return ((m_Raw[x] == m_Raw[y]) || (m_AuxData[x] < m_Lambda));
  }
 
  void
  Union(OffsetValueType n, OffsetValueType p)
  {
    OffsetValueType r = FindRoot(n);
 
    if (r != p)
    {
      if (Criterion(r, p))
      {
        m_AuxData[p] += m_AuxData[r];
        m_Parent[r] = p;
      }
      else
      {
        m_AuxData[p] = m_Lambda;
      }
    }
  }
 
#else
  // version from ISMM paper
  void
  MakeSet(OffsetValueType x)
  {
    m_Parent[x] = ACTIVE;
    m_AuxData[x] = m_AttributeValuePerPixel;
  }
 
  void
  Link(OffsetValueType x, OffsetValueType y)
  {
    if ((m_Parent[y] == ACTIVE) && (m_Parent[x] == ACTIVE))
    {
      // should be a call to MergeAuxData
      m_AuxData[y] = m_AuxData[x] + m_AuxData[y];
      m_AuxData[x] = -m_AttributeValuePerPixel;
    }
    else if (m_Parent[x] == ACTIVE)
    {
      m_AuxData[x] = -m_AttributeValuePerPixel;
    }
    else
    {
      m_AuxData[y] = -m_AttributeValuePerPixel;
      m_Parent[y] = INACTIVE;
    }
    m_Parent[x] = y;
  }
 
  OffsetValueType
  FindRoot(OffsetValueType x)
  {
    if (m_Parent[x] >= 0)
    {
      m_Parent[x] = FindRoot(m_Parent[x]);
      return (m_Parent[x]);
    }
    else
    {
      return (x);
    }
  }
 
  bool
  Equiv(OffsetValueType x, OffsetValueType y)
  {
    return ((m_Raw[x] == m_Raw[y]) || (m_Parent[x] == ACTIVE));
  }
 
  void
  Union(OffsetValueType n, OffsetValueType p)
  {
    OffsetValueType r = FindRoot(n);
 
    if (r != p)
    {
      if (Equiv(r, p))
      {
        Link(r, p);
      }
      else if (m_Parent[p] == ACTIVE)
      {
        m_Parent[p] = INACTIVE;
        m_AuxData[p] = -m_AttributeValuePerPixel;
      }
    }
  }
 
#endif
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkAttributeMorphologyBaseImageFilter.hxx"
#endif
 
#endif