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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNeighborhoodSampler.txx,v $
Language: C++
Date: $Date: 2009-03-04 15:24:04 $
Version: $Revision: 1.11 $
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 __itkNeighborhoodSampler_txx
#define __itkNeighborhoodSampler_txx
#include "itkNeighborhoodSampler.h"
#include "vnl/vnl_math.h"
namespace itk {
namespace Statistics {
template< class TSample >
NeighborhoodSampler< TSample >
::NeighborhoodSampler()
{
m_Center = 0;
m_Radius = 0;
m_Subsample = SubsampleType::New();
}
template< class TSample >
void
NeighborhoodSampler< TSample >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Center: ";
if ( m_Center != 0 )
{
os << (*m_Center) << std::endl;
}
else
{
os << "not set. " << std::endl;
}
os << indent << "Radius: ";
if ( m_Radius != 0 )
{
os << (*m_Radius) << std::endl;
}
else
{
os << "not set." << std::endl;
}
os << indent << "Output " << m_Subsample << std::endl;
os << indent << "Output Size " << m_Subsample->Size() << std::endl;
}
template< class TSample >
typename NeighborhoodSampler< TSample >::OutputPointer
NeighborhoodSampler< TSample >
::GetOutput()
{
return m_Subsample;
}
template< class TSample >
void
NeighborhoodSampler< TSample >
::GenerateData()
{
if (m_Radius == 0 || m_Center == 0 || this->GetInputSample() == 0)
{
itkExceptionMacro("Member variables have not been properly set.");
}
// Assert at run time that the given center has the same length as
// measurement vectors in the sample and that the size is non-zero.
if( this->GetMeasurementVectorSize() &&
( m_Center->Size() != this->GetMeasurementVectorSize() ) )
{
itkExceptionMacro( << "Size of measurement vectors in the sample is: " <<
this->GetMeasurementVectorSize() << " but size of center is: " <<
m_Center->Size() );
}
m_Subsample->SetSample(this->GetInputSample());
unsigned int j;
double squaredRadius;
double distance;
double coordinateDistance;
MeasurementVectorType tempVector;
squaredRadius = (*m_Radius) * (*m_Radius);
m_Subsample->Clear();
typename TSample::ConstIterator iter = this->GetInputSample()->Begin();
typename TSample::ConstIterator last = this->GetInputSample()->End();
while (iter != last)
{
distance = 0.0;
tempVector = iter.GetMeasurementVector();
for (j = 0; j < this->GetMeasurementVectorSize() && distance < squaredRadius; j++)
{
coordinateDistance = (double)tempVector[j] - (*m_Center)[j];
if (vnl_math_abs(coordinateDistance) > (*m_Radius) )
{
distance = squaredRadius;
}
}
for (j = 0; j < this->GetMeasurementVectorSize()
&& distance < squaredRadius; j++)
{
coordinateDistance = (double)tempVector[j] - (*m_Center)[j];
distance += coordinateDistance * coordinateDistance;
}
if (distance < squaredRadius)
{
m_Subsample->AddInstance(iter.GetInstanceIdentifier());
}
++iter;
}
}
} // end of namespace Statistics
} // end of namespace itk
#endif
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