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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkIntensityWindowingImageFilter.txx,v $
Language: C++
Date: $Date: 2004-03-31 03:37:17 $
Version: $Revision: 1.6 $
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 _itkIntensityWindowingImageFilter_txx
#define _itkIntensityWindowingImageFilter_txx
#include "itkIntensityWindowingImageFilter.h"
#include "itkMinimumMaximumImageCalculator.h"
namespace itk
{
/**
*
*/
template <class TInputImage, class TOutputImage>
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::IntensityWindowingImageFilter()
{
m_OutputMaximum = NumericTraits<OutputPixelType>::max();
m_OutputMinimum = NumericTraits<OutputPixelType>::NonpositiveMin();
m_WindowMaximum = NumericTraits<InputPixelType>::max();
m_WindowMinimum = NumericTraits<InputPixelType>::NonpositiveMin();
m_Scale = 1.0;
m_Shift = 0.0;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::SetWindowLevel(const InputPixelType& window, const InputPixelType& level)
{
typedef typename NumericTraits<InputPixelType>::RealType InputRealType;
InputRealType tmp1, tmp2;
tmp1 = static_cast<InputRealType>(level)
- (static_cast<InputRealType>(window)/2.0);
if (tmp1 < NumericTraits<InputPixelType>::NonpositiveMin())
{
tmp1 = 0.0;
}
tmp2 = static_cast<InputRealType>(level)
+ (static_cast<InputRealType>(window)/2.0);
if (tmp2 > NumericTraits<InputPixelType>::max())
{
tmp2 = NumericTraits<InputPixelType>::max();
}
m_WindowMinimum = static_cast<InputPixelType>(tmp1);
m_WindowMaximum = static_cast<InputPixelType>(tmp2);
}
/**
*
*/
template <class TInputImage, class TOutputImage>
typename IntensityWindowingImageFilter<TInputImage, TOutputImage>::InputPixelType
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::GetWindow() const
{
return m_WindowMaximum - m_WindowMinimum;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
typename IntensityWindowingImageFilter<TInputImage, TOutputImage>::InputPixelType
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::GetLevel() const
{
return (m_WindowMaximum + m_WindowMinimum) / 2;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Output Minimum: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutputMinimum)
<< std::endl;
os << indent << "Output Maximum: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutputMaximum)
<< std::endl;
os << indent << "Window Minimum: "
<< static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_WindowMinimum)
<< std::endl;
os << indent << "Window Maximum: "
<< static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_WindowMaximum)
<< std::endl;
os << indent << "Scale Factor: "
<< static_cast<typename NumericTraits<RealType>::PrintType>(m_Scale)
<< std::endl;
os << indent << "Shift offset: "
<< static_cast<typename NumericTraits<RealType>::PrintType>(m_Shift)
<< std::endl;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
IntensityWindowingImageFilter<TInputImage, TOutputImage>
::BeforeThreadedGenerateData()
{
m_Scale =
(static_cast<RealType>( m_OutputMaximum )
- static_cast<RealType>( m_OutputMinimum )) /
(static_cast<RealType>( m_WindowMaximum )
- static_cast<RealType>( m_WindowMinimum ));
m_Shift =
static_cast<RealType>( m_OutputMinimum ) -
static_cast<RealType>( m_WindowMinimum ) * m_Scale;
// set up the functor values
this->GetFunctor().SetOutputMinimum( m_OutputMinimum );
this->GetFunctor().SetOutputMaximum( m_OutputMaximum );
this->GetFunctor().SetWindowMinimum( m_WindowMinimum );
this->GetFunctor().SetWindowMaximum( m_WindowMaximum );
this->GetFunctor().SetFactor( m_Scale );
this->GetFunctor().SetOffset( m_Shift );
}
} // end namespace itk
#endif
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