itkMultiphaseSparseFiniteDifferenceImageFilter.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 itkMultiphaseSparseFiniteDifferenceImageFilter_h
#define itkMultiphaseSparseFiniteDifferenceImageFilter_h

#include "itkMultiphaseFiniteDifferenceImageFilter.h"
#include "itkZeroCrossingImageFilter.h"
#include "itkImageRegionConstIterator.h"
#include "itkShiftScaleImageFilter.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkSparseFieldLevelSetImageFilter.h"

#include <vector>

namespace itk
{
template< typename TInputImage, typename TFeatureImage, typename TOutputImage, typename TFunction,
          typename TIdCell = unsigned int >
class MultiphaseSparseFiniteDifferenceImageFilter:
  public MultiphaseFiniteDifferenceImageFilter< TInputImage,
                                                TFeatureImage, TOutputImage, TFunction, TIdCell >
{
public:

  typedef MultiphaseSparseFiniteDifferenceImageFilter Self;
  typedef MultiphaseFiniteDifferenceImageFilter< TInputImage,
                                                 TFeatureImage, TOutputImage, TFunction, TIdCell >     Superclass;
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(MultiphaseSparseFiniteDifferenceImageFilter, MultiphaseFiniteDifferenceImageFilter);

  itkStaticConstMacro(ImageDimension, unsigned int, Superclass::ImageDimension);

  typedef typename Superclass::TimeStepType TimeStepType;

  typedef typename Superclass::InputImageType         InputImageType;
  typedef typename Superclass::InputImagePointer      InputImagePointer;
  typedef typename Superclass::InputRegionType        InputRegionType;
  typedef typename Superclass::InputSizeType          InputSizeType;
  typedef typename Superclass::InputSizeValueType     InputSizeValueType;
  typedef typename Superclass::InputIndexType         InputIndexType;
  typedef typename Superclass::InputIndexValueType    InputIndexValueType;
  typedef typename Superclass::InputPixelType         InputPixelType;
  typedef typename Superclass::InputPointType         InputPointType;
  typedef typename Superclass::InputSpacingType       InputSpacingType;
  typedef typename Superclass::InputOffsetValueType   InputOffsetValueType;

  typedef typename Superclass::FeatureImageType    FeatureImageType;
  typedef typename Superclass::FeatureSizeType     FeatureSizeType;
  typedef typename Superclass::FeatureImagePointer FeatureImagePointer;
  typedef typename Superclass::FeatureRegionType   FeatureRegionType;
  typedef typename Superclass::FeatureSpacingType  FeatureSpacingType;
  typedef typename Superclass::FeaturePointType    FeaturePointType;

  typedef typename Superclass::OutputImageType      OutputImageType;
  typedef typename Superclass::OutputImagePointer   OutputImagePointer;
  typedef typename Superclass::OutputRegionType     OutputRegionType;
  typedef typename Superclass::OutputSizeType       OutputSizeType;
  typedef typename Superclass::OutputIndexType      OutputIndexType;
  typedef typename Superclass::OutputIndexValueType OutputIndexValueType;
  typedef typename Superclass::OutputPixelType      OutputPixelType;

  typedef typename InputImageType::ValueType ValueType;
  typedef typename Superclass::IdCellType    IdCellType;

  typedef typename Superclass::FiniteDifferenceFunctionType
  FiniteDifferenceFunctionType;
  typedef typename Superclass::FiniteDifferenceFunctionPointer
  FiniteDifferenceFunctionPointer;
  typedef typename FiniteDifferenceFunctionType::FloatOffsetType
  FiniteDifferenceFunctionFloatOffsetType;

  typedef SparseFieldLevelSetNode< OutputIndexType > LayerNodeType;

  typedef SparseFieldLayer< LayerNodeType > LayerType;
  typedef typename LayerType::Pointer       LayerPointerType;
  typedef typename LayerType::Iterator      LayerIterator;
  typedef typename LayerType::ConstIterator LayerConstIterator;

  typedef std::vector< LayerPointerType >        LayerListType;
  typedef typename LayerListType::iterator       LayerListIterator;
  typedef typename LayerListType::const_iterator LayerListConstIterator;

  typedef signed char StatusType;

  typedef Image< StatusType, itkGetStaticConstMacro(ImageDimension) >
  StatusImageType;
  typedef typename StatusImageType::Pointer StatusImagePointer;

  typedef ZeroCrossingImageFilter< InputImageType, InputImageType >
  ZeroCrossingFilterType;
  typedef typename ZeroCrossingFilterType::Pointer
  ZeroCrossingFilterPointer;

  typedef NeighborhoodAlgorithm::ImageBoundaryFacesCalculator< StatusImageType > BFCType;

  typedef ObjectStore< LayerNodeType >           LayerNodeStorageType;
  typedef typename LayerNodeStorageType::Pointer LayerNodeStoragePointer;

  typedef std::vector< ValueType >                  UpdateBufferType;
  typedef typename UpdateBufferType::const_iterator UpdateBufferConstIterator;

  typedef SparseFieldCityBlockNeighborList< NeighborhoodIterator< OutputImageType > > NeighborListType;
  typedef typename NeighborListType::OffsetType                                       OffsetType;

  itkSetMacro(NumberOfLayers, unsigned int);
  itkGetConstMacro(NumberOfLayers, unsigned int);

  itkSetMacro(IsoSurfaceValue, ValueType);
  itkGetConstMacro(IsoSurfaceValue, ValueType);

  itkSetMacro(InterpolateSurfaceLocation, bool);
  itkGetConstMacro(InterpolateSurfaceLocation, bool);

  void InterpolateSurfaceLocationOn()
  { this->SetInterpolateSurfaceLocation(true); }
  void InterpolateSurfaceLocationOff()
  { this->SetInterpolateSurfaceLocation(false); }

  void SetFunctionCount(const IdCellType & n)
  {
    this->Superclass::SetFunctionCount(n);

    m_SparseData.resize(this->m_FunctionCount, ITK_NULLPTR);

    for ( IdCellType i = 0; i < this->m_FunctionCount; i++ )
      {
      m_SparseData[i] = new SparseDataStruct(i);
      }
  }

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( OutputEqualityComparableCheck,
                   ( Concept::EqualityComparable< typename TOutputImage::PixelType > ) );
  itkConceptMacro( DoubleConvertibleToOutputCheck,
                   ( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
  itkConceptMacro( OutputOStreamWritableCheck,
                   ( Concept::OStreamWritable< typename TOutputImage::PixelType > ) );
  // End concept checking
#endif

protected:
  MultiphaseSparseFiniteDifferenceImageFilter();
  ~MultiphaseSparseFiniteDifferenceImageFilter()
  {
    while ( !m_SparseData.empty() )
      {
      delete m_SparseData.back();
      m_SparseData.pop_back();
      }
  }

  virtual void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;

  // This data structure is created for each phase
  struct SparseDataStruct {
    SparseDataStruct(const IdCellType & index)
    {
      m_LayerNodeStore = LayerNodeStorageType::New();
      m_LayerNodeStore->SetGrowthStrategyToExponential();
      m_Index = index;
    }

    LayerListType m_Layers;

    StatusImagePointer m_StatusImage;

    LayerNodeStoragePointer m_LayerNodeStore;

    UpdateBufferType m_UpdateBuffer;

    IdCellType m_Index;
  };

  NeighborListType m_NeighborList;

  std::vector< ValueType > m_PixelDistance;

  inline virtual ValueType CalculateUpdateValue(
    const OutputIndexType & itkNotUsed(idx),
    const TimeStepType & dt,
    const ValueType & value,
    const ValueType & change)
  {
    return ( value + dt * change );
  }

  virtual void PostProcessOutput() ITK_OVERRIDE;

  virtual void InitializeBackgroundPixels();

  void Initialize() ITK_OVERRIDE;

  void CopyInputToOutput() ITK_OVERRIDE;

  void AllocateUpdateBuffer() ITK_OVERRIDE {}

  void ApplyUpdate(TimeStepType dt) ITK_OVERRIDE;

  TimeStepType CalculateChange() ITK_OVERRIDE;

  void ConstructLayer(SparseDataStruct *sparsePtr, StatusType from, StatusType
                      to);

  void ConstructActiveLayer();

  void InitializeActiveLayerValues();

  void InitializeBackgroundConstants();

  void PropagateLayerValues(SparseDataStruct *sparsePtr, StatusType from,
                            StatusType to, StatusType promote, int InOrOut);

  void PropagateAllLayerValues();

  void PropagateFunctionLayerValues(unsigned int functionIndex);

  void UpdateActiveLayerValues(TimeStepType dt, LayerType *StatusUpList,
                               LayerType *StatusDownList);

  void ProcessStatusList(LayerType *InputList, LayerType *OutputList,
                         StatusType ChangeToStatus, StatusType SearchForStatus);

  void ProcessOutsideList(LayerType *OutsideList, StatusType ChangeToStatus);

  void InitializeIteration() ITK_OVERRIDE;

  virtual void UpdatePixel( unsigned int itkNotUsed(functionIndex), unsigned int itkNotUsed(idx),
                            NeighborhoodIterator< InputImageType > & itkNotUsed(iterator), ValueType & itkNotUsed(
                              newValue),
                            bool & itkNotUsed(status) ){}

  itkGetConstMacro(ValueZero, ValueType);
  itkGetConstMacro(ValueOne, ValueType);

  static double m_ConstantGradientValue;

  static const ValueType m_ValueOne;

  static const ValueType m_ValueZero;

  static const StatusType m_StatusChanging;

  static const StatusType m_StatusActiveChangingUp;

  static const StatusType m_StatusActiveChangingDown;

  static const StatusType m_StatusBoundaryPixel;

  static const StatusType m_StatusNull;

  std::vector< SparseDataStruct * > m_SparseData;

  unsigned int m_NumberOfLayers;

  ValueType m_IsoSurfaceValue;

  ValueType m_BackgroundValue;

  bool m_InterpolateSurfaceLocation;

private:
  MultiphaseSparseFiniteDifferenceImageFilter(const Self &);
  void operator=(const Self &);      //purposely not implemented

  unsigned int m_CurrentFunctionIndex;

  double       m_RMSSum;
  unsigned int m_RMSCounter;

  bool m_BoundsCheckingActive;
};
} // end namespace itk

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

#endif