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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkOtsuMultipleThresholdsCalculator.h,v $
Language: C++
Date: $Date: 2005-11-25 15:50:35 $
Version: $Revision: 1.4 $
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 __itkOtsuMultipleThresholdsCalculator_h
#define __itkOtsuMultipleThresholdsCalculator_h
#include "itkHistogramAlgorithmBase.h"
#include "itkHistogram.h"
namespace itk
{
/** \class OtsuMultipleThresholdsCalculator
* \brief Computes Otsu's thresholds for a histogram.
*
* You plug in the target histogram using SetInputHistogram method and
* specify the number of thresholds you want to be computed. Then call
* the GenerateData method to run the alogithm.
*
* The thresholds are computed so that the between-class variance is
* maximized.
*
* \ingroup Calculators
*/
template< class TInputHistogram >
class OtsuMultipleThresholdsCalculator :
public HistogramAlgorithmBase< TInputHistogram >
{
public:
/**Standard class typedefs. */
typedef OtsuMultipleThresholdsCalculator Self;
typedef HistogramAlgorithmBase<TInputHistogram> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef typename TInputHistogram::MeasurementType MeasurementType;
typedef typename TInputHistogram::FrequencyType FrequencyType;
typedef typename NumericTraits<MeasurementType>::RealType MeanType;
typedef typename NumericTraits<MeasurementType>::RealType VarianceType;
typedef std::vector<MeanType> MeanVectorType;
typedef std::vector<FrequencyType> FrequencyVectorType;
typedef typename TInputHistogram::InstanceIdentifier InstanceIdentifierType;
typedef std::vector<InstanceIdentifierType> InstanceIdentifierVectorType;
/**Standard Macros */
itkTypeMacro(OtsuMultipleThresholdsCalculator, HistogramAlgorithmsBase);
itkNewMacro(Self) ;
/** Typedef for the thresholds output */
typedef std::vector<MeasurementType> OutputType ;
/** Returns the thresholds vector */
const OutputType& GetOutput() ;
/** Set/Get the number of thresholds. */
itkSetClampMacro(NumberOfThresholds, unsigned long, 1, NumericTraits<unsigned long>::max() );
itkGetMacro(NumberOfThresholds,unsigned long);
protected:
OtsuMultipleThresholdsCalculator() ;
virtual ~OtsuMultipleThresholdsCalculator() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** Calculates the thresholds and save them */
void GenerateData() ;
/** Increment the thresholds of one position */
bool IncrementThresholds(InstanceIdentifierVectorType& thresholdIds, MeanType totalMean, MeanVectorType& classMean, FrequencyVectorType& classFrequency);
private:
/** Internal thresholds storage */
unsigned long m_NumberOfThresholds;
OutputType m_Output ;
} ; // end of class
} // end of namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkOtsuMultipleThresholdsCalculator.txx"
#endif
#endif
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