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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: ExpectationMaximizationClusteringMethod.h
Language: C++
Date: $Date$
Version: $Revision$
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 __ExpectationMaximizationClusteringMethod_h
#define __ExpectationMaximizationClusteringMethod_h
#include <time.h>
#include "itkMacro.h"
#include "itkArray.h"
#include "itkVector.h"
#include "itkExpectationMaximizationMixtureModelEstimator.h"
#include "itkGaussianMixtureModelComponent.h"
template< class TSample, class THistogram >
class ExpectationMaximizationClusteringMethod
{
public:
ExpectationMaximizationClusteringMethod() ;
~ExpectationMaximizationClusteringMethod() {}
typedef itk::Statistics::ExpectationMaximizationMixtureModelEstimator< THistogram >
EstimatorType ;
typedef itk::Statistics::GaussianMixtureModelComponent< THistogram >
ComponentType ;
typedef itk::hash_map< typename TSample::InstanceIdentifier,
unsigned int > ClusterLabelsType ;
typedef itk::Array< double > ParametersType ;
void SetInitialParameters(ParametersType& parameters)
{ m_InitialParameters = parameters ; }
void SetMaximumIteration(unsigned int numberOfIterations)
{ m_MaximumIteration = numberOfIterations ; }
void SetHistogram(THistogram* histogram)
{ m_Histogram = histogram ; }
void SetSample(TSample* sample)
{ m_Sample = sample ; }
void Initialize(unsigned int numberOfClusters) ;
void Run() ;
unsigned int GetLastIteration()
{ return m_LastIteration ; }
ParametersType& GetEstimatedParameters()
{ return m_EstimatedParameters ; }
ClusterLabelsType* GetClusterLabels()
{ return &m_ClusterLabels ; }
double GetTotalElapsedTime()
{ return double(m_ProcessEnd - m_ProcessBegin) / CLOCKS_PER_SEC ; }
double GetEstimationElapsedTime()
{ return double(m_EstimationEnd - m_ProcessBegin) / CLOCKS_PER_SEC ; }
private:
/** inputs */
THistogram* m_Histogram ;
TSample* m_Sample ;
unsigned int m_NumberOfComponents ;
ParametersType m_InitialParameters ;
unsigned int m_MaximumIteration ;
/** outputs */
ParametersType m_EstimatedParameters ;
unsigned int m_LastIteration ;
time_t m_ProcessBegin ;
time_t m_EstimationEnd ;
time_t m_ProcessEnd ;
itk::hash_map< typename TSample::InstanceIdentifier, unsigned int > m_ClusterLabels ;
/** helper classes */
EstimatorType::Pointer m_Estimator ;
std::vector< typename ComponentType::Pointer > m_Components ;
} ; // end of class
#ifndef ITK_MANUAL_INSTANTIATION
#include "ExpectationMaximizationClusteringMethod.txx"
#endif
#endif // __ExpectationMaximizationClusteringMethod_h
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