mitkSimpleHistogram.h

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/*============================================================================
 
The Medical Imaging Interaction Toolkit (MITK)
 
Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.
 
Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.
 
============================================================================*/
 
#ifndef mitkSimpleHistogram_h
#define mitkSimpleHistogram_h
 
#ifndef __itkHistogram_h
#include <itkHistogram.h>
#endif
 
#include "MitkAlgorithmsExtExports.h"
 
#include <mitkImage.h>
#include <mitkWeakPointer.h>
 
#include <itkImageRegionIterator.h>
#include <itkImageRegionIteratorWithIndex.h>
 
namespace mitk
{
  //##Documentation
  //## @brief Abstract superclass for histograms with double values.
  //##        Classes which are deriving from this class can be cached
  //##        in the same way.
  class MITKALGORITHMSEXT_EXPORT SimpleHistogram
  {
  public:
    virtual double GetMin() const = 0;
    virtual double GetMax() const = 0;
    virtual void ComputeFromBaseData(BaseData *source) = 0;
    virtual float GetRelativeBin(double start, double end) const = 0;
  };
 
  class MITKALGORITHMSEXT_EXPORT SimpleImageHistogram : public SimpleHistogram
  {
  public:
    typedef itk::Statistics::Histogram<double> HistogramType;
 
    SimpleImageHistogram()
    {
      valid = false;
    }
 
    ~SimpleImageHistogram()
    {
    }
 
    bool GetValid();
 
    typedef itk::Image<short, 3> CTImage;
    typedef itk::ImageRegionIterator<CTImage> CTIteratorType;
    typedef itk::ImageRegionIteratorWithIndex<CTImage> CTIteratorIndexType;
 
    typedef itk::Image<unsigned char, 3> BinImage;
    typedef itk::ImageRegionIterator<BinImage> BinIteratorType;
    typedef itk::ImageRegionIteratorWithIndex<BinImage> BinIteratorIndexType;
 
    typedef unsigned long CountType;
 
  protected:
    HistogramType::ConstPointer histogram;
 
    bool valid;
    unsigned int nBins = 256;
    double invLogHighest;
 
  public:
    double GetMin() const override;
    double GetMax() const override;
 
    void ComputeFromBaseData(BaseData *source) override;
    float GetRelativeBin(double start, double end) const override;
  };
 
  class MITKALGORITHMSEXT_EXPORT SimpleHistogramCache
  {
  public:
    static const unsigned int maxCacheSize = 64;
 
    class MITKALGORITHMSEXT_EXPORT Element
    {
    public:
      mitk::WeakPointer<BaseData> baseData;
      itk::TimeStamp m_LastUpdateTime;
 
      virtual ~Element();
 
      virtual void ComputeFromBaseData(BaseData *baseData) = 0;
      virtual SimpleHistogram *GetHistogram() = 0;
    };
 
    typedef std::list<Element *> CacheContainer;
 
    CacheContainer cache;
 
    SimpleHistogramCache() {}
    ~SimpleHistogramCache() { TrimCache(true); }
    SimpleHistogram *operator[](BaseData::Pointer sp_BaseData);
 
  protected:
    void TrimCache(bool full = false)
    {
      unsigned int targetSize = full ? 0 : maxCacheSize;
 
      while (cache.size() > targetSize)
      {
        delete cache.back();
        cache.pop_back();
      }
    }
  };
}
 
#endif