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/*=========================================================================
Copyright (c) Kitware, Inc.
All rights reserved.
See Copyright.txt or http://www.kitware.com/VolViewCopyright.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 notice for more information.
=========================================================================*/
#ifndef __itkMSEImageCalculator_txx
#define __itkMSEImageCalculator_txx
#include "itkMSEImageCalculator.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkNumericTraits.h"
namespace itk
{
/**
* Constructor
*/
template<class TInputImage1, class TInputImage2>
MSEImageCalculator<TInputImage1, TInputImage2>
::MSEImageCalculator()
{
m_MSE = 0;
m_RegionSetByUser = false;
m_Radius = 100000000.0; // some Large value.
m_Center.Fill(0);
}
/**
* Compute Min and Max of m_Image
*/
template<class TInputImage1, class TInputImage2>
double
MSEImageCalculator<TInputImage1, TInputImage2>
::Compute()
{
if( !m_RegionSetByUser )
{
m_Region = m_Image1->GetRequestedRegion();
m_Region.Crop(m_Image2->GetRequestedRegion());
}
ImageRegionConstIteratorWithIndex< TInputImage1 > it1( m_Image1, m_Region );
ImageRegionConstIterator< TInputImage2 > it2( m_Image2, m_Region );
Index1Type index;
PointType point;
VectorType distanceVector;
typename VectorType::RealValueType distanceSq;
const typename VectorType::RealValueType radiusSq = m_Radius * m_Radius;
it1.GoToBegin();
it2.GoToBegin();
m_MSE = 0;
unsigned long nPixels = 0;
while( !it1.IsAtEnd() )
{
// Check if we are within the bounds
index = it1.GetIndex();
m_Image1->TransformIndexToPhysicalPoint( index, point );
distanceVector = point - m_Center;
distanceSq = distanceVector.GetSquaredNorm();
if (distanceSq > radiusSq)
{
++it1;
++it2;
continue;
}
const double v1 = it1.Get();
const double v2 = it2.Get();
const double diff = v1 - v2;
m_MSE += (diff * diff);
++it1;
++it2;
++nPixels;
}
if( nPixels == 0 )
{
itkExceptionMacro(<< "No pixels to evaluate MSE");
}
const double n = static_cast< double >(nPixels);
m_MSE /= n;
return m_MSE;
}
template<class TInputImage1, class TInputImage2>
void
MSEImageCalculator<TInputImage1, TInputImage2>
::SetRegion( const RegionType & region )
{
m_Region = region;
m_RegionSetByUser = true;
}
template<class TInputImage1, class TInputImage2>
void
MSEImageCalculator<TInputImage1, TInputImage2>
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Region: " << std::endl;
m_Region.Print(os,indent.GetNextIndent());
os << indent << "Region set by User: " << m_RegionSetByUser << std::endl;
}
} // end namespace itk
#endif
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