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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkRescaleIntensityImageFilter.txx,v $
Language: C++
Date: $Date: 2006-10-18 14:10:05 $
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.
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 _itkRescaleIntensityImageFilter_txx
#define _itkRescaleIntensityImageFilter_txx
#include "itkRescaleIntensityImageFilter.h"
#include "itkMinimumMaximumImageCalculator.h"
namespace itk
{
/**
*
*/
template <class TInputImage, class TOutputImage>
RescaleIntensityImageFilter<TInputImage, TOutputImage>
::RescaleIntensityImageFilter()
{
m_OutputMaximum = NumericTraits<OutputPixelType>::max();
m_OutputMinimum = NumericTraits<OutputPixelType>::NonpositiveMin();
m_InputMaximum = NumericTraits<InputPixelType>::Zero;
m_InputMinimum = NumericTraits<InputPixelType>::max();
m_Scale = 1.0;
m_Shift = 0.0;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
RescaleIntensityImageFilter<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;
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
RescaleIntensityImageFilter<TInputImage, TOutputImage>
::BeforeThreadedGenerateData()
{
if ( m_OutputMinimum > m_OutputMaximum )
{
itkExceptionMacro(<<"Minimum output value cannot be greater than Maximum output value.");
return;
}
typedef MinimumMaximumImageCalculator< TInputImage > CalculatorType;
typename CalculatorType::Pointer calculator = CalculatorType::New();
calculator->SetImage( this->GetInput() );
calculator->Compute();
m_InputMinimum = calculator->GetMinimum();
m_InputMaximum = calculator->GetMaximum();
if (m_InputMinimum != m_InputMaximum)
{
m_Scale =
(static_cast<RealType>( m_OutputMaximum )
- static_cast<RealType>( m_OutputMinimum )) /
(static_cast<RealType>( m_InputMaximum )
- static_cast<RealType>( m_InputMinimum ));
}
else if (m_InputMaximum != NumericTraits<InputPixelType>::Zero)
{
m_Scale =
(static_cast<RealType>( m_OutputMaximum )
- static_cast<RealType>( m_OutputMinimum )) /
static_cast<RealType>( m_InputMaximum );
}
else
{
m_Scale = 0.0;
}
m_Shift =
static_cast<RealType>( m_OutputMinimum ) -
static_cast<RealType>( m_InputMinimum ) * m_Scale;
// set up the functor values
this->GetFunctor().SetMinimum( m_OutputMinimum );
this->GetFunctor().SetMaximum( m_OutputMaximum );
this->GetFunctor().SetFactor( m_Scale );
this->GetFunctor().SetOffset( m_Shift );
}
} // end namespace itk
#endif
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