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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkVectorRescaleIntensityImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkVectorRescaleIntensityImageFilter_txx
#define __itkVectorRescaleIntensityImageFilter_txx
#include "itkVectorRescaleIntensityImageFilter.h"
namespace itk
{
/**
*
*/
template <class TInputImage, class TOutputImage>
VectorRescaleIntensityImageFilter<TInputImage, TOutputImage>
::VectorRescaleIntensityImageFilter()
{
m_OutputMaximumMagnitude = NumericTraits< OutputRealType >::Zero;
m_InputMaximumMagnitude = NumericTraits< InputRealType >::Zero;
m_Scale = 1.0;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
VectorRescaleIntensityImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Output Maximum Magnitude: "
<< static_cast<typename NumericTraits<OutputRealType>::PrintType>(m_OutputMaximumMagnitude)
<< std::endl;
os << indent << "Input Maximum Magnitude: "
<< static_cast<typename NumericTraits<InputRealType>::PrintType>(m_InputMaximumMagnitude)
<< std::endl;
os << indent << "Internal Scale : "
<< static_cast<typename NumericTraits<InputRealType>::PrintType>(m_Scale)
<< std::endl;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
VectorRescaleIntensityImageFilter<TInputImage, TOutputImage>
::BeforeThreadedGenerateData()
{
if ( m_OutputMaximumMagnitude < NumericTraits<OutputRealType>::Zero )
{
itkExceptionMacro(<<"Maximum output value cannot be negative. You are passing " << m_OutputMaximumMagnitude);
return;
}
InputImagePointer inputImage = this->GetInput();
typedef ImageRegionConstIterator< InputImageType > InputIterator;
InputIterator it( inputImage, inputImage->GetBufferedRegion() );
it.GoToBegin();
InputRealType maximumSquaredMagnitude = NumericTraits<InputRealType>::Zero;
while( !it.IsAtEnd() )
{
InputRealType magnitude = it.Get().GetSquaredNorm();
if( magnitude > maximumSquaredMagnitude )
{
maximumSquaredMagnitude = magnitude;
}
++it;
}
m_InputMaximumMagnitude = vcl_sqrt(maximumSquaredMagnitude );
m_Scale = static_cast<InputRealType>( m_OutputMaximumMagnitude ) /
static_cast<InputRealType>( m_InputMaximumMagnitude );
// set up the functor values
this->GetFunctor().SetFactor( m_Scale );
}
} // end namespace itk
#endif
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