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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGaussianMixtureModelComponentTest.cxx
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.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include "itkWin32Header.h"
#include <fstream>
#include "itkPoint.h"
#include "itkPointSet.h"
#include "itkArray.h"
#include "itkVector.h"
#include "itkPointSetToListSampleAdaptor.h"
#include "itkSubsample.h"
#include "itkGaussianMixtureModelComponent.h"
#include "itkExpectationMaximizationMixtureModelEstimator.h"
int itkGaussianMixtureModelComponentTest(int argc, char* argv[] )
{
typedef itk::PointSet< double, 2 > PointSetType;
typedef itk::Statistics::PointSetToListSampleAdaptor< PointSetType >
DataSampleType;
typedef itk::Statistics::GaussianMixtureModelComponent< DataSampleType >
ComponentType;
if (argc < 2)
{
std::cout << "ERROR: data file name argument missing."
<< std::endl;
return EXIT_FAILURE;
}
char* dataFileName = argv[1];
int dataSize = 2000;
typedef itk::Array< double > ParametersType;
unsigned int numberOfClasses = 2;
std::vector< ParametersType > trueParameters(numberOfClasses);
ParametersType params(6);
params[0] = 99.261;
params[1] = 100.078;
params[2] = 814.95741;
params[3] = 38.40308;
params[4] = 38.40308;
params[5] = 817.64446;
trueParameters[0] = params;
params[0] = 200.1;
params[1] = 201.3;
params[2] = 859.785295;
params[3] = -3.617316;
params[4] = -3.617316;
params[5] = 848.991508;
trueParameters[1] = params;
// only the means are altered
std::vector< ParametersType > initialParameters(numberOfClasses);
params[0] = 80.0;
params[1] = 80.0;
params[2] = 814.95741;
params[3] = 38.40308;
params[4] = 38.40308;
params[5] = 817.64446;
initialParameters[0] = params;
params[0] = 180.0;
params[1] = 180.0;
params[2] = 859.785295;
params[3] = -3.617316;
params[4] = -3.617316;
params[5] = 848.991508;
initialParameters[1] = params;
itk::Array< double > trueProportions(numberOfClasses);
trueProportions[0] = 0.5;
trueProportions[1] = 0.5;
itk::Array< double > initialProportions(numberOfClasses);
initialProportions[0] = 0.5;
initialProportions[1] = 0.5;
/* Loading point data */
PointSetType::Pointer pointSet = PointSetType::New();
PointSetType::PointsContainerPointer pointsContainer =
PointSetType::PointsContainer::New();
pointsContainer->Reserve(dataSize);
pointSet->SetPoints(pointsContainer.GetPointer());
PointSetType::PointsContainerIterator p_iter = pointsContainer->Begin();
PointSetType::PointType point;
double temp;
std::ifstream dataStream(dataFileName);
if ( !dataStream )
{
std::cout << "ERROR: fail to open the data file." << std::endl;
return EXIT_FAILURE;
}
while (p_iter != pointsContainer->End())
{
for (unsigned int i = 0; i < PointSetType::PointDimension; i++)
{
dataStream >> temp;
point[i] = temp;
}
p_iter.Value() = point;
++p_iter;
}
dataStream.close();
/* Importing the point set to the sample */
DataSampleType::Pointer sample =
DataSampleType::New();
sample->SetPointSet(pointSet.GetPointer());
/* Preparing the gaussian mixture components */
typedef ComponentType::Pointer ComponentPointer;
std::vector< ComponentPointer > components;
for ( unsigned int i = 0; i < numberOfClasses; i++ )
{
components.push_back(ComponentType::New());
(components[i])->SetSample(sample.GetPointer());
(components[i])->SetParameters(initialParameters[i]);
}
ComponentPointer testComponent = ComponentType::New();
std::cout << testComponent->GetNameOfClass() << std::endl;
testComponent->Print( std::cout );
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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