Review/Statistics/itkHistogram.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkHistogram.h,v $
  Language:  C++
  Date:      $Date: 2009-05-22 12:54:58 $
  Version:   $Revision: 1.3 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkHistogram_h
#define __itkHistogram_h

#include <vector>

#include "itkArray.h"
#include "itkSample.h"
#include "itkDenseFrequencyContainer2.h"
#include "itkSparseFrequencyContainer2.h"

namespace itk {
namespace Statistics {

template <typename THistogram>
struct GetHistogramDimension
{
  itkStaticConstMacro(HistogramDimension, unsigned int, THistogram::MeasurementVectorSize);
};

template < class TMeasurement = float,
           class TFrequencyContainer = DenseFrequencyContainer2 >
class ITK_EXPORT Histogram
  : public Sample < Array< TMeasurement > >
{
public:

  // This type serves as the indirect definition of MeasurementVectorType
  typedef Array< TMeasurement >        ArrayType;

  typedef Histogram                    Self;
  typedef Sample< ArrayType  >         Superclass;
  typedef SmartPointer<Self>           Pointer;
  typedef SmartPointer<const Self>     ConstPointer;

  itkTypeMacro(Histogram, Sample);

  itkNewMacro(Self);

  typedef TMeasurement MeasurementType;

  itkSuperclassTraitMacro(MeasurementVectorType)
  itkSuperclassTraitMacro(InstanceIdentifier)
  itkSuperclassTraitMacro(MeasurementVectorSizeType)
    typedef MeasurementVectorType ValueType;

  typedef TFrequencyContainer                        FrequencyContainerType;
  typedef typename FrequencyContainerType::Pointer   FrequencyContainerPointer;

  typedef typename FrequencyContainerType::AbsoluteFrequencyType      AbsoluteFrequencyType;
  typedef typename FrequencyContainerType::TotalAbsoluteFrequencyType TotalAbsoluteFrequencyType;
  typedef typename FrequencyContainerType::RelativeFrequencyType      RelativeFrequencyType;
  typedef typename FrequencyContainerType::TotalRelativeFrequencyType TotalRelativeFrequencyType;

  typedef Array< long >                     IndexType;
  typedef typename IndexType::ValueType     IndexValueType;

  typedef Array< unsigned long >            SizeType;
  typedef typename SizeType::ValueType      SizeValueType;

  typedef std::vector< MeasurementType >    BinMinVectorType;
  typedef std::vector< MeasurementType >    BinMaxVectorType;
  typedef std::vector< BinMinVectorType >   BinMinContainerType;
  typedef std::vector< BinMaxVectorType >   BinMaxContainerType;


  void Initialize(const SizeType &size);


  void Initialize(const SizeType &size, MeasurementVectorType& lowerBound,
                  MeasurementVectorType& upperBound);

  void SetToZero();

  const IndexType & GetIndex(const MeasurementVectorType& measurement) const;

  bool GetIndex(const MeasurementVectorType & measurement,
                IndexType & index ) const;

  const IndexType & GetIndex( InstanceIdentifier id) const;

  itkGetConstMacro(ClipBinsAtEnds, bool);

  itkSetMacro(ClipBinsAtEnds, bool);

  bool IsIndexOutOfBounds(const IndexType &index) const;

  InstanceIdentifier GetInstanceIdentifier(const IndexType &index) const;

  InstanceIdentifier Size() const;

  const SizeType & GetSize() const;

  SizeValueType GetSize(unsigned int dimension) const;

  const MeasurementType& GetBinMin(unsigned int dimension,
                             InstanceIdentifier nbin) const;

  const MeasurementType& GetBinMax(unsigned int dimension,
                             InstanceIdentifier nbin) const;

  void SetBinMin(unsigned int dimension, InstanceIdentifier nbin,
                 MeasurementType min);

  void SetBinMax(unsigned int dimension,
                 InstanceIdentifier nbin, MeasurementType max);

  const MeasurementType& GetBinMinFromValue(unsigned int dimension,
                                      float value ) const;

  const MeasurementType& GetBinMaxFromValue(unsigned int dimension,
                                      float value ) const;

  const BinMinVectorType& GetDimensionMins(unsigned int dimension) const;

  const BinMaxVectorType& GetDimensionMaxs(unsigned int dimension) const;

  const BinMinContainerType& GetMins() const;

  const BinMaxContainerType& GetMaxs() const;

  const MeasurementVectorType & GetHistogramMinFromIndex(const IndexType &index) const;

  const MeasurementVectorType& GetHistogramMaxFromIndex(const IndexType &index) const;

  AbsoluteFrequencyType GetFrequency( InstanceIdentifier id ) const;

  AbsoluteFrequencyType GetFrequency(const IndexType &index) const;

  void SetFrequency( AbsoluteFrequencyType value );

  bool SetFrequency( InstanceIdentifier id, AbsoluteFrequencyType value);

  bool SetFrequency(const IndexType &index,
                    AbsoluteFrequencyType value);

  bool SetFrequency(const MeasurementVectorType &measurement,
                    AbsoluteFrequencyType value);


  bool IncreaseFrequency(InstanceIdentifier id, AbsoluteFrequencyType value);

  bool IncreaseFrequency(const IndexType &index, AbsoluteFrequencyType value);

  bool IncreaseFrequency(const MeasurementVectorType &measurement,
                         AbsoluteFrequencyType value);

  const MeasurementVectorType & GetMeasurementVector( InstanceIdentifier id) const;

  const MeasurementVectorType & GetMeasurementVector(const IndexType &index) const;

  MeasurementType GetMeasurement(InstanceIdentifier n,
                                 unsigned int dimension) const;

  TotalAbsoluteFrequencyType GetTotalFrequency() const;

  AbsoluteFrequencyType GetFrequency(InstanceIdentifier n,
                             unsigned int dimension) const;

  double Quantile(unsigned int dimension, double p) const;

  virtual void Graft( const DataObject * );

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

public:

  class ConstIterator
    {
    public:

    friend class Histogram;

    ConstIterator(const Self * histogram)
      {
      m_Id = 0;
      m_Histogram = histogram;
      }

    ConstIterator(const ConstIterator & it)
      {
      m_Id        = it.m_Id;
      m_Histogram = it.m_Histogram;
      }

    ConstIterator& operator=(const ConstIterator& it)
      {
      m_Id  = it.m_Id;
      m_Histogram = it.m_Histogram;
      return *this;
      }

    AbsoluteFrequencyType GetFrequency() const
      {
      return  m_Histogram->GetFrequency(m_Id);
      }

    InstanceIdentifier GetInstanceIdentifier() const
      {
      return m_Id;
      }

    const MeasurementVectorType & GetMeasurementVector() const
      {
      return m_Histogram->GetMeasurementVector(m_Id);
      }

    ConstIterator& operator++()
      {
      ++m_Id;
      return *this;
      }

    bool operator!=(const ConstIterator& it)
      {
      return (m_Id != it.m_Id);
      }

    bool operator==(const ConstIterator& it)
      {
      return (m_Id == it.m_Id);
      }

#if !(defined(_MSC_VER) && (_MSC_VER <= 1200))
  protected:
#endif
    // This method is purposely not implemented
    ConstIterator();

    ConstIterator(InstanceIdentifier id, const Self * histogram)
      : m_Id(id), m_Histogram(histogram)
      {}

    // ConstIterator pointing DenseFrequencyContainer
    InstanceIdentifier m_Id;

    // Pointer of DenseFrequencyContainer
    const Self* m_Histogram;
    }; // end of iterator class

  class Iterator : public ConstIterator
  {
  public:

    Iterator(Self * histogram):ConstIterator( histogram )
      {
      }

    Iterator(InstanceIdentifier id, Self * histogram)
        : ConstIterator( id, histogram )
      {}

    Iterator(const Iterator & it):ConstIterator(it)
      {
      }

    Iterator & operator=(const Iterator& it)
      {
      this->ConstIterator::operator=( it );
      return *this;
      }

    bool SetFrequency(const AbsoluteFrequencyType value)
      {
      Self * histogram = const_cast< Self * >( this->m_Histogram );
      return histogram->SetFrequency( this->m_Id, value );
      }

#if !(defined(_MSC_VER) && (_MSC_VER <= 1200))
  protected:
#endif
    // To ensure const-correctness these method must not be in the public API.
    // The are purposly not implemented, since they should never be called.
    Iterator();
    Iterator(const Self * histogram);
    Iterator(InstanceIdentifier id, const Self * histogram);
    Iterator(const ConstIterator & it);
    ConstIterator& operator=(const ConstIterator& it);

  private:
    }; // end of iterator class


  Iterator  Begin()
    {
    Iterator iter(0, this);
    return iter;
    }

  Iterator  End()
    {
    return Iterator(m_OffsetTable[this->GetMeasurementVectorSize()], this);
    }

  ConstIterator  Begin() const
    {
    ConstIterator iter(0, this);
    return iter;
    }

  ConstIterator End() const
    {
    return ConstIterator(m_OffsetTable[this->GetMeasurementVectorSize()], this);
    }

protected:
  Histogram();
  virtual ~Histogram() {}

  // The number of bins for each dimension
  SizeType m_Size;

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

  typedef std::vector< InstanceIdentifier >   OffsetTableType;
  OffsetTableType                             m_OffsetTable;
  FrequencyContainerPointer                   m_FrequencyContainer;
  unsigned int                                m_NumberOfInstances;

  // This method is provided here just to avoid a "hidden" warning 
  // related to the virtual method available in DataObject.
  virtual void Initialize() {};

  // lower bound of each bin
  std::vector< std::vector<MeasurementType> > m_Min;

  // upper bound of each bin
  std::vector< std::vector<MeasurementType> > m_Max;

  mutable MeasurementVectorType   m_TempMeasurementVector;
  mutable IndexType               m_TempIndex;

  bool                            m_ClipBinsAtEnds;
};

} // end of namespace Statistics
} // end of namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkHistogram.txx"
#endif

#endif

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