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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkMeanSquaresHistogramImageToImageMetric.txx,v $
Language: C++
Date: $Date: 2005-06-21 14:43:08 $
Version: $Revision: 1.4 $
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 __itkMeanSquaresHistogramImageToImageMetric_txx
#define __itkMeanSquaresHistogramImageToImageMetric_txx
#include "itkMeanSquaresHistogramImageToImageMetric.h"
namespace itk
{
template <class TFixedImage, class TMovingImage>
typename MeanSquaresHistogramImageToImageMetric<TFixedImage, TMovingImage>
::MeasureType
MeanSquaresHistogramImageToImageMetric<TFixedImage, TMovingImage>
::EvaluateMeasure(HistogramType& histogram) const
{
MeasureType measure = NumericTraits<MeasureType>::Zero;
HistogramIteratorType it = histogram.Begin();
HistogramIteratorType end = histogram.End();
HistogramFrequencyType totalNumberOfSamples =
NumericTraits<HistogramFrequencyType>::Zero;
while (it != end)
{
HistogramFrequencyType freq = it.GetFrequency();
if (freq > 0)
{
HistogramMeasurementVectorType value = it.GetMeasurementVector();
measure += (value[0] - value[1])*(value[0] - value[1])*freq;
totalNumberOfSamples += freq;
}
++it;
}
measure /= totalNumberOfSamples;
return measure;
}
} // End namespace itk
#endif // itkMeanSquaresHistogramImageToImageMetric_txx
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