text: /*=========================================================================
   *
   *  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 __itkRegionBasedLevelSetFunctionSharedData_h
  #define __itkRegionBasedLevelSetFunctionSharedData_h
  
  #include "itkLightObject.h"
  
  #include "itkVector.h"
  #include "itkListSample.h"
  #include "itkKdTreeGenerator.h"
  
  #include "itkImageRegionIterator.h"
  #include "itkImageRegionIteratorWithIndex.h"
  
  namespace itk
  {
  /** \class RegionBasedLevelSetFunctionSharedData
   *
   * \brief Helper class used to share data in the ScalarChanAndVeseLevelSetFunction.
   *
   * This class holds cache data used during the computation of the LevelSet updates.
   *
   * Based on the paper:
   *
   *        "An active contour model without edges"
   *         T. Chan and L. Vese.
   *         In Scale-Space Theories in Computer Vision, pages 141-151, 1999.
   *
   * \author Mosaliganti K., Smith B., Gelas A., Gouaillard A., Megason S.
   *
   *  This code was taken from the Insight Journal paper:
   *
   *      "Cell Tracking using Coupled Active Surfaces for Nuclei and Membranes"
   *      http://www.insight-journal.org/browse/publication/642
   *      http://hdl.handle.net/10380/3055
   *
   *  That is based on the papers:
   *
   *      "Level Set Segmentation: Active Contours without edge"
   *      http://www.insight-journal.org/browse/publication/322
   *      http://hdl.handle.net/1926/1532
   *
   *      and
   *
   *      "Level set segmentation using coupled active surfaces"
   *      http://www.insight-journal.org/browse/publication/323
   *      http://hdl.handle.net/1926/1533
   *
   *
   * \ingroup ITKReview
   */
  template< typename TInputImage, typename TFeatureImage, typename TSingleData >
  class RegionBasedLevelSetFunctionSharedData:public LightObject
  {
  public:
  
    typedef RegionBasedLevelSetFunctionSharedData Self;
    typedef LightObject                           Superclass;
    typedef SmartPointer< Self >                  Pointer;
    typedef SmartPointer< const Self >            ConstPointer;
  
    itkStaticConstMacro(ImageDimension, unsigned int, TFeatureImage::ImageDimension);
  
    itkTypeMacro(RegionBasedLevelSetFunctionSharedData, LightObject);
  
    typedef TInputImage                             InputImageType;
    typedef typename InputImageType::Pointer        InputImagePointer;
    typedef typename InputImageType::ConstPointer   InputImageConstPointer;
    typedef typename InputImageType::PixelType      InputPixelType;
    typedef typename InputImageType::RegionType     InputRegionType;
    typedef typename InputImageType::SizeType       InputSizeType;
    typedef typename InputSizeType::SizeValueType   InputSizeValueType;
    typedef typename InputImageType::SpacingType    InputSpacingType;
    typedef typename InputImageType::IndexType      InputIndexType;
    typedef typename InputIndexType::IndexValueType InputIndexValueType;
    typedef typename InputImageType::PointType      InputPointType;
  
    typedef TFeatureImage                           FeatureImageType;
    typedef typename FeatureImageType::Pointer      FeatureImagePointer;
    typedef typename FeatureImageType::ConstPointer FeatureImageConstPointer;
    typedef typename FeatureImageType::PixelType    FeaturePixelType;
    typedef typename FeatureImageType::RegionType   FeatureRegionType;
    typedef typename FeatureImageType::SizeType     FeatureSizeType;
    typedef typename FeatureSizeType::SizeValueType FeatureSizeValueType;
    typedef typename FeatureImageType::SpacingType  FeatureSpacingType;
    typedef typename FeatureImageType::IndexType    FeatureIndexType;
    typedef typename FeatureImageType::PointType    FeaturePointType;
  
    typedef std::list< unsigned int > ListPixelType;
    typedef Image< ListPixelType, itkGetStaticConstMacro(ImageDimension) >
    ListImageType;
    typedef typename ListImageType::Pointer               ListImagePointer;
    typedef typename ListImageType::ConstPointer          ListImageConstPointer;
    typedef typename ListImageType::RegionType            ListRegionType;
    typedef typename ListImageType::SizeType              ListSizeType;
    typedef typename ListSizeType::SizeValueType          ListSizeValueType;
    typedef typename ListImageType::SpacingType           ListSpacingType;
    typedef typename ListImageType::IndexType             ListIndexType;
    typedef typename ListIndexType::IndexValueType        ListIndexValueType;
    typedef typename ListImageType::PointType             ListPointType;
    typedef ImageRegionIteratorWithIndex< ListImageType > ListIteratorType;
  
    typedef Vector< float, itkGetStaticConstMacro(ImageDimension) >
    CentroidVectorType;
    typedef itk::Statistics::ListSample< CentroidVectorType > SampleType;
    typedef itk::Statistics::KdTreeGenerator< SampleType >    TreeGeneratorType;
    typedef typename TreeGeneratorType::Pointer               TreePointer;
    typedef typename TreeGeneratorType::KdTreeType            TreeType;
    typedef typename TreeType::Pointer                        KdTreePointer;
  
    typedef TSingleData                                  LevelSetDataType;
    typedef typename LevelSetDataType::Pointer           LevelSetDataPointer;
    typedef std::vector< LevelSetDataPointer >           LevelSetDataPointerVector;
    typedef typename LevelSetDataPointerVector::iterator LevelSetDataPointerVectorIterator;
  
    void SetFunctionCount(const unsigned int & n)
    {
      this->m_FunctionCount = n;
      this->m_LevelSetDataPointerVector.resize(n, ITK_NULLPTR);
  
      LevelSetDataPointerVectorIterator it = m_LevelSetDataPointerVector.begin();
      LevelSetDataPointerVectorIterator end = m_LevelSetDataPointerVector.end();
      while ( it != end )
        {
        ( *it ) = LevelSetDataType::New();
        it++;
        }
    }
  
    void SetNumberOfNeighbors(const unsigned int & n)
    {
      this->m_NumberOfNeighbors = n;
    }
  
    void CreateHeavisideFunctionOfLevelSetImage(const unsigned int & j, const InputImageType *image)
    {
      m_LevelSetDataPointerVector[j]->CreateHeavisideFunctionOfLevelSetImage(image);
    }
  
    void SetKdTree(KdTreePointer kdtree)
    {
      this->m_KdTree = kdtree;
    }
  
    void AllocateListImage(const FeatureImageType *featureImage)
    {
      this->m_NearestNeighborListImage = ListImageType::New();
      this->m_NearestNeighborListImage->CopyInformation(featureImage);
      this->m_NearestNeighborListImage->SetRegions( featureImage->GetLargestPossibleRegion() );
      this->m_NearestNeighborListImage->Allocate();
    }
  
    virtual void PopulateListImage() = 0;
  
    LevelSetDataPointerVector m_LevelSetDataPointerVector;
  
    unsigned int     m_FunctionCount;
    unsigned int     m_NumberOfNeighbors;
    ListImagePointer m_NearestNeighborListImage;
    KdTreePointer    m_KdTree;
  
  protected:
    RegionBasedLevelSetFunctionSharedData():m_NumberOfNeighbors(6), m_KdTree(ITK_NULLPTR){}
    ~RegionBasedLevelSetFunctionSharedData(){}
  
  private:
    RegionBasedLevelSetFunctionSharedData(const Self &); //purposely not
                                                         // implemented
    void operator=(const Self &);                        //purposely not
                                                         // implemented
  };
  } //end namespace itk
  
  #endif
  