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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkHypersphereKernelMeanShiftModeSeeker.txx,v $
Language: C++
Date: $Date: 2009-03-04 15:23:50 $
Version: $Revision: 1.7 $
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 __itkHypersphereKernelMeanShiftModeSeeker_txx
#define __itkHypersphereKernelMeanShiftModeSeeker_txx
#include "vnl/vnl_math.h"
namespace itk {
namespace Statistics {
template< class TSample >
HypersphereKernelMeanShiftModeSeeker< TSample >
::HypersphereKernelMeanShiftModeSeeker()
{
m_SearchRadius = 0.0;
}
template< class TSample >
HypersphereKernelMeanShiftModeSeeker< TSample >
::~HypersphereKernelMeanShiftModeSeeker()
{
}
template< class TSample >
void
HypersphereKernelMeanShiftModeSeeker< TSample >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Search radius: " << m_SearchRadius << std::endl;
}
template< class TSample >
void
HypersphereKernelMeanShiftModeSeeker< TSample >
::SetSearchRadius(double radius)
{
if ( m_SearchRadius != radius )
{
m_SearchRadius = radius;
this->Modified();
}
}
template< class TSample >
inline bool
HypersphereKernelMeanShiftModeSeeker< TSample >
::ComputeMode(MeasurementVectorType queryPoint,
MeasurementVectorType& newPoint)
{
const TSample* inputSample = this->GetInputSample();
float frequencySum;
SearchResultVectorType result;
inputSample->Search( queryPoint, m_SearchRadius, result );
frequencySum = 0.0f;
MeasurementVectorTraits::SetLength( m_TempVectorSum,
this->GetMeasurementVectorSize() );
m_TempVectorSum.Fill( NumericTraits< RealMeasurementType >::Zero );
typename SearchResultVectorType::const_iterator iter = result.begin();
while ( iter != result.end() )
{
m_TempVector = inputSample->GetMeasurementVector(*iter);
for ( unsigned int i = 0; i < this->GetMeasurementVectorSize(); ++i )
{
m_TempVectorSum[i] += m_TempVector[i];
}
frequencySum += inputSample->GetFrequency(*iter);
++iter;
}
if ( frequencySum == 0 )
{
return false;
}
for ( unsigned int i = 0; i < this->GetMeasurementVectorSize(); ++i )
{
newPoint[i] = (MeasurementType) (m_TempVectorSum[i] / frequencySum);
}
return true;
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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