itkLabelGeometryImageFilter.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 itkLabelGeometryImageFilter_h
#define itkLabelGeometryImageFilter_h

#include "itkImageToImageFilter.h"
#include "itkNumericTraits.h"
#include "itkArray.h"
#include "itkSimpleDataObjectDecorator.h"
#include "itksys/hash_map.hxx"
#include <vector>
#include "vnl/algo/vnl_symmetric_eigensystem.h"
#include "vnl/vnl_det.h"
#include "itkMath.h"

namespace itk
{
template< typename TLabelImage, typename TIntensityImage = TLabelImage >
class ITK_TEMPLATE_EXPORT LabelGeometryImageFilter:
  public ImageToImageFilter< TLabelImage, TIntensityImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(LabelGeometryImageFilter);

  using Self = LabelGeometryImageFilter;
  using Superclass = ImageToImageFilter< TLabelImage, TIntensityImage >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(LabelGeometryImageFilter, ImageToImageFilter);

  using IntensityImageType = TIntensityImage;
  using InputImagePointer = typename TIntensityImage::Pointer;
  using RegionType = typename TIntensityImage::RegionType;
  using SizeType = typename TIntensityImage::SizeType;
  using IndexType = typename TIntensityImage::IndexType;
  using PixelType = typename TIntensityImage::PixelType;

  using LabelImageType = TLabelImage;
  using LabelImagePointer = typename TLabelImage::Pointer;
  using LabelRegionType = typename TLabelImage::RegionType;
  using LabelSizeType = typename TLabelImage::SizeType;
  using LabelIndexType = typename TLabelImage::IndexType;
  using LabelPixelType = typename TLabelImage::PixelType;
  using LabelPointType = typename TLabelImage::PointType;

  static constexpr unsigned int ImageDimension = TLabelImage::ImageDimension;

  using RealType = typename NumericTraits< PixelType >::RealType;

  using DataObjectPointer = typename DataObject::Pointer;

  using RealObjectType = SimpleDataObjectDecorator< RealType >;

  using BoundingBoxType = itk::FixedArray< typename LabelIndexType::IndexValueType,
                           Self::ImageDimension *2 >;
  using BoundingBoxFloatType = itk::FixedArray< float,
                           Self::ImageDimension *2 >;

  // using BoundingBoxVerticesType = itk::FixedArray<
  // LabelPointType,std::pow(2.0,Self::ImageDimension)>;
  using BoundingBoxVerticesType = std::vector< LabelPointType >;

  using AxesLengthType = itk::FixedArray< RealType, Self::ImageDimension >;

  using IndexArrayType = itk::FixedArray< typename LabelIndexType::IndexValueType,
                           Self::ImageDimension >;

  using LabelsType = std::vector< LabelPixelType >;

  using LabelIndicesType = std::vector< LabelIndexType >;

  using VectorType = std::vector< double >;

  using MatrixType = vnl_matrix< double >;

  class LabelGeometry
  {
public:
    // default constructor
    LabelGeometry()
    {
      // initialized to the default values
      this->m_Label = 0;
      this->m_Sum = NumericTraits< RealType >::ZeroValue();

      const unsigned int imageDimension = Self::ImageDimension;

      //m_BoundingBox.resize(imageDimension*2);
      for ( unsigned int i = 0; i < imageDimension * 2; i += 2 )
        {
        m_BoundingBox[i] = NumericTraits< typename IndexType::IndexValueType >::max();
        m_BoundingBox[i + 1] = NumericTraits< typename IndexType::IndexValueType >::NonpositiveMin();
        }

      m_BoundingBoxVolume = 0;
      m_BoundingBoxSize.Fill(0);
      m_PixelIndices.clear();
      m_Centroid.Fill(0);
      m_WeightedCentroid.Fill(0);
      m_ZeroOrderMoment = 0;
      m_FirstOrderRawMoments.Fill(0);
      m_FirstOrderWeightedRawMoments.Fill(0);
      m_Eigenvalues.resize(ImageDimension);
      m_Eigenvalues.clear();
      m_Eigenvectors.set_size(ImageDimension, ImageDimension);
      m_Eigenvectors.fill(0);
      m_AxesLength.Fill(0);
      m_Eccentricity = 1;
      m_Elongation = 1;
      m_Orientation = 0;
      LabelPointType emptyPoint;
      emptyPoint.Fill(0);
      unsigned int numberOfVertices = 1 << ImageDimension;
      m_OrientedBoundingBoxVertices.resize(numberOfVertices, emptyPoint);
      m_OrientedBoundingBoxVolume = 0;
      m_OrientedBoundingBoxSize.Fill(0);
      m_OrientedLabelImage = LabelImageType::New();
      m_OrientedIntensityImage = IntensityImageType::New();
      m_OrientedBoundingBoxOrigin.Fill(0);
      m_RotationMatrix.set_size(ImageDimension, ImageDimension);
      m_RotationMatrix.fill(0.0);

      m_SecondOrderRawMoments.set_size(ImageDimension, ImageDimension);
      m_SecondOrderCentralMoments.set_size(ImageDimension, ImageDimension);
      for ( unsigned int i = 0; i < ImageDimension; i++ )
        {
        for ( unsigned int j = 0; j < ImageDimension; j++ )
          {
          m_SecondOrderRawMoments(i, j) = 0;
          m_SecondOrderCentralMoments(i, j) = 0;
          }
        }
    }

    LabelPixelType                                              m_Label;
    RealType                                                    m_Sum;
    LabelPointType                                              m_Centroid;
    LabelPointType                                              m_WeightedCentroid;
    SizeValueType                                               m_ZeroOrderMoment;
    IndexArrayType                                              m_FirstOrderRawMoments;
    IndexArrayType                                              m_FirstOrderWeightedRawMoments;
    SizeValueType                                               m_FirstOrderRawCrossMoment;
    RealType                                                    m_FirstOrderCentralCrossMoment;
    MatrixType                                                  m_SecondOrderRawMoments;
    MatrixType                                                  m_SecondOrderCentralMoments;
    VectorType                                                  m_Eigenvalues;
    MatrixType                                                  m_Eigenvectors;
    FixedArray< float, Self::ImageDimension > m_AxesLength;
    RealType                                                    m_Eccentricity;
    RealType                                                    m_Elongation;
    RealType                                                    m_Orientation;
    BoundingBoxType                                             m_BoundingBox;
    LabelSizeType                                               m_BoundingBoxSize;
    RealType                                                    m_BoundingBoxVolume;
    LabelIndicesType                                            m_PixelIndices;
    BoundingBoxVerticesType                                     m_OrientedBoundingBoxVertices;
    RealType                                                    m_OrientedBoundingBoxVolume;
    LabelPointType                                              m_OrientedBoundingBoxSize;
    typename LabelImageType::Pointer m_OrientedLabelImage;
    typename IntensityImageType::Pointer m_OrientedIntensityImage;
    MatrixType     m_RotationMatrix;
    LabelPointType m_OrientedBoundingBoxOrigin;
  };

  // Map from the label to the class storing all of the geometry information.
  using MapType = itksys::hash_map< LabelPixelType, LabelGeometry >;
  using MapIterator = typename itksys::hash_map< LabelPixelType, LabelGeometry >::iterator;
  using MapConstIterator = typename itksys::hash_map< LabelPixelType, LabelGeometry >::const_iterator;

  // Macros for enabling the calculation of additional features.
  itkGetMacro(CalculatePixelIndices, bool);
  itkBooleanMacro(CalculatePixelIndices);
  void SetCalculatePixelIndices(const bool value)
  {
    // CalculateOrientedBoundingBox, CalculateOrientedLabelImage, and
    // CalculateOrientedIntensityImage all need CalculatePixelIndices to be
    // turned
    // on if they are turned on.  So, CalculatePixelIndices cannot be
    // turned off if any of these flags are turned on.
    if ( value == false )
      {
      if ( ( this->m_CalculateOrientedBoundingBox == true )
           || ( this->m_CalculateOrientedLabelRegions == true )
           || ( this->m_CalculateOrientedIntensityRegions == true ) )
        {
        // We cannot change the value, so return.
        return;
        }
      }

    if ( this->m_CalculatePixelIndices != value )
      {
      this->m_CalculatePixelIndices = value;
      this->Modified();
      }
  }

  itkGetMacro(CalculateOrientedBoundingBox, bool);
  itkBooleanMacro(CalculateOrientedBoundingBox);
  void SetCalculateOrientedBoundingBox(const bool value)
  {
    if ( this->m_CalculateOrientedBoundingBox != value )
      {
      this->m_CalculateOrientedBoundingBox = value;
      this->Modified();
      }

    // CalculateOrientedBoundingBox needs
    // CalculatePixelIndices to be turned on.
    if ( value == true )
      {
      this->SetCalculatePixelIndices(true);
      }
  }

  itkGetMacro(CalculateOrientedLabelRegions, bool);
  itkBooleanMacro(CalculateOrientedLabelRegions);
  void SetCalculateOrientedLabelRegions(const bool value)
  {
    if ( this->m_CalculateOrientedLabelRegions != value )
      {
      this->m_CalculateOrientedLabelRegions = value;
      this->Modified();

      // CalculateOrientedLabelImage needs
      // CalculateOrientedBoundingBox to be turned on.
      if ( value == true )
        {
        SetCalculateOrientedBoundingBox(true);
        }
      }
  }

  itkGetMacro(CalculateOrientedIntensityRegions, bool);
  itkBooleanMacro(CalculateOrientedIntensityRegions);
  void SetCalculateOrientedIntensityRegions(const bool value)
  {
    if ( this->m_CalculateOrientedIntensityRegions != value )
      {
      this->m_CalculateOrientedIntensityRegions = value;
      this->Modified();

      // CalculateOrientedIntensityImage needs
      // CalculateOrientedBoundingBox to be turned on.
      if ( value == true )
        {
        this->SetCalculateOrientedBoundingBox(true);
        }
      }
  }

  void SetIntensityInput(const TIntensityImage *input)
  {
    // Process object is not const-correct so the const casting is required.
    this->SetNthInput( 1, const_cast< TIntensityImage * >( input ) );
  }

  const TIntensityImage * GetIntensityInput() const
  {
    return static_cast< TIntensityImage * >( const_cast< DataObject * >( this->ProcessObject::GetInput(1) ) );
  }

  bool HasLabel(LabelPixelType label) const
  {
    return m_LabelGeometryMapper.find(label) != m_LabelGeometryMapper.end();
  }

  SizeValueType GetNumberOfObjects() const
  {
    return m_LabelGeometryMapper.size();
  }

  SizeValueType GetNumberOfLabels() const
  {
    return this->GetNumberOfObjects();
  }

  std::vector< LabelPixelType > GetLabels() const
  {
    return m_AllLabels;
  }

  LabelIndicesType GetPixelIndices(LabelPixelType label) const;

  SizeValueType GetVolume(LabelPixelType label) const;

  //std::vector< SizeValueType > GetAllCounts() const;

  RealType GetIntegratedIntensity(LabelPixelType label) const;

  LabelPointType GetCentroid(LabelPixelType label) const;

  LabelPointType GetWeightedCentroid(LabelPixelType label) const;

  VectorType GetEigenvalues(LabelPixelType label) const;

  MatrixType GetEigenvectors(LabelPixelType label) const;

  AxesLengthType GetAxesLength(LabelPixelType label) const;

  RealType GetMinorAxisLength(LabelPixelType label) const;

  RealType GetMajorAxisLength(LabelPixelType label) const;

  RealType GetEccentricity(LabelPixelType label) const;

  RealType GetElongation(LabelPixelType label) const;

  RealType GetOrientation(LabelPixelType label) const;

  BoundingBoxType GetBoundingBox(LabelPixelType label) const;

  RealType GetBoundingBoxVolume(LabelPixelType label) const;

  LabelSizeType GetBoundingBoxSize(LabelPixelType label) const;

  BoundingBoxVerticesType GetOrientedBoundingBoxVertices(LabelPixelType label) const;

  RealType GetOrientedBoundingBoxVolume(LabelPixelType label) const;

  LabelPointType GetOrientedBoundingBoxSize(LabelPixelType label) const;

  LabelPointType GetOrientedBoundingBoxOrigin(LabelPixelType label) const;

  MatrixType GetRotationMatrix(LabelPixelType label) const;

  RegionType GetRegion(LabelPixelType label) const;

  TLabelImage * GetOrientedLabelImage(LabelPixelType label) const;

  TIntensityImage * GetOrientedIntensityImage(LabelPixelType label) const;

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< PixelType > ) );
  // End concept checking
#endif

protected:
  LabelGeometryImageFilter();
  ~LabelGeometryImageFilter() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;

  void GenerateData() override;

private:
  bool CalculateOrientedBoundingBoxVertices(vnl_symmetric_eigensystem< double > eig, LabelGeometry & m_LabelGeometry);

  bool m_CalculatePixelIndices;
  bool m_CalculateOrientedBoundingBox;
  bool m_CalculateOrientedLabelRegions;
  bool m_CalculateOrientedIntensityRegions;

  MapType       m_LabelGeometryMapper;
  LabelGeometry m_LabelGeometry;
  LabelsType    m_AllLabels;
}; // end of class

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLabelGeometryImageFilter.hxx"
#endif

#endif