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/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt 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.
=========================================================================*/
#include <fstream>
#include "itkPoint.h"
#include "itkPointSetToListSampleAdaptor.h"
#include "itkSubsample.h"
#include "otbSVMClassifier.h"
int otbSVMClassifierPointSet(int argc, char* argv[])
{
if (argc != 2)
{
std::cout << "Usage : " << argv[0] << " modelFile"
<< std::endl;
return EXIT_FAILURE;
}
const char * modelFilename = argv[1];
std::cout << "Building the pointset" << std::endl;
typedef double InputPixelType;
typedef int LabelPixelType;
typedef std::vector<InputPixelType> InputVectorType;
const unsigned int Dimension = 2;
typedef itk::PointSet<InputVectorType, Dimension>
MeasurePointSetType;
MeasurePointSetType::Pointer mPSet = MeasurePointSetType::New();
typedef MeasurePointSetType::PointType MeasurePointType;
typedef MeasurePointSetType::PointsContainer MeasurePointsContainer;
MeasurePointsContainer::Pointer mCont = MeasurePointsContainer::New();
unsigned int pointId;
for (pointId = 0; pointId < 20; pointId++)
{
MeasurePointType mP;
mP[0] = pointId;
mP[1] = pointId;
InputVectorType measure;
//measure.push_back(vcl_pow(pointId, 2.0));
measure.push_back(double(2.0 * pointId));
measure.push_back(double(-10));
mCont->InsertElement(pointId, mP);
mPSet->SetPointData(pointId, measure);
}
mPSet->SetPoints(mCont);
std::cout << "PointSet built" << std::endl;
typedef itk::Statistics::PointSetToListSampleAdaptor<MeasurePointSetType>
SampleType;
SampleType::Pointer sample = SampleType::New();
sample->SetPointSet(mPSet);
std::cout << "Sample set to Adaptor" << std::endl;
/** preparing classifier and decision rule object */
typedef otb::SVMModel<SampleType::MeasurementVectorType::ValueType, LabelPixelType> ModelType;
ModelType::Pointer model = ModelType::New();
model->LoadModel(modelFilename);
std::cout << "Model loaded" << std::endl;
int numberOfClasses = model->GetNumberOfClasses();
typedef otb::SVMClassifier<SampleType, LabelPixelType> ClassifierType;
ClassifierType::Pointer classifier = ClassifierType::New();
classifier->SetNumberOfClasses(numberOfClasses);
classifier->SetModel(model);
classifier->SetInput(sample.GetPointer());
classifier->Update();
/* Build the class map */
std::cout << "classifier get output" << std::endl;
ClassifierType::OutputType* membershipSample =
classifier->GetOutput();
std::cout << "Sample iterators" << std::endl;
ClassifierType::OutputType::ConstIterator m_iter =
membershipSample->Begin();
ClassifierType::OutputType::ConstIterator m_last =
membershipSample->End();
double error = 0.0;
pointId = 0;
while (m_iter != m_last)
{
ClassifierType::ClassLabelType label = m_iter.GetClassLabel();
InputVectorType measure;
mPSet->GetPointData(pointId, &measure);
if (label != ((measure[0] + measure[1]) > 0)) error++;
std::cout << label << "/" <<
((measure[0] + measure[1]) > 0) << std::endl;
++pointId;
++m_iter;
}
std::cout << "Error = " << error / pointId << std::endl;
return EXIT_SUCCESS;
}
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