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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkShiftScaleImageFilter.txx,v $
Language: C++
Date: $Date: 2003-12-15 14:13:18 $
Version: $Revision: 1.8 $
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 _itkShiftScaleImageFilter_txx
#define _itkShiftScaleImageFilter_txx
#include "itkShiftScaleImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
namespace itk {
template<class TInputImage, class TOutputImage>
ShiftScaleImageFilter<TInputImage, TOutputImage>
::ShiftScaleImageFilter()
{
m_Shift = NumericTraits<RealType>::Zero;
m_Scale = NumericTraits<RealType>::One;
m_UnderflowCount = 0;
m_OverflowCount = 0;
m_ThreadUnderflow.SetSize(1);
m_ThreadOverflow.SetSize(1);
}
template<class TInputImage, class TOutputImage>
ShiftScaleImageFilter<TInputImage, TOutputImage>
::~ShiftScaleImageFilter()
{
}
template<class TInputImage, class TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>
::BeforeThreadedGenerateData ()
{
int numberOfThreads = this->GetNumberOfThreads();
// Allocate and initialize the thread temporaries
m_ThreadUnderflow.SetSize(numberOfThreads);
m_ThreadUnderflow.Fill(0);
m_ThreadOverflow.SetSize(numberOfThreads);
m_ThreadOverflow.Fill(0);
}
template<class TInputImage, class TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>
::AfterThreadedGenerateData ()
{
int numberOfThreads = this->GetNumberOfThreads();
m_UnderflowCount = 0;
m_OverflowCount = 0;
// Accumulate counts for each thread
for( int i = 0; i < numberOfThreads; i++)
{
m_UnderflowCount += m_ThreadUnderflow[i];
m_OverflowCount += m_ThreadOverflow[i];
}
}
template<class TInputImage, class TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>
::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
int threadId)
{
RealType value;
ImageRegionConstIterator<TInputImage> it (this->GetInput(), outputRegionForThread);
ImageRegionIterator<TOutputImage> ot (this->GetOutput(), outputRegionForThread);
// support progress methods/callbacks
ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
// shift and scale the input pixels
while (!it.IsAtEnd())
{
value = (static_cast<RealType>(it.Get()) + m_Shift) * m_Scale;
if (value < NumericTraits<OutputImagePixelType>::NonpositiveMin())
{
ot.Set (NumericTraits<OutputImagePixelType>::NonpositiveMin());
m_ThreadUnderflow[threadId]++;
}
else if (value > NumericTraits<OutputImagePixelType>::max())
{
ot.Set (NumericTraits<OutputImagePixelType>::max());
m_ThreadOverflow[threadId]++;
}
else
{
ot.Set( static_cast<OutputImagePixelType>( value ) );
}
++it;
++ot;
progress.CompletedPixel();
}
}
template <class TInputImage, class TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Shift: " << m_Shift << std::endl;
os << indent << "Scale: " << m_Scale << std::endl;
os << indent << "Computed values follow:" << std::endl;
os << indent << "UnderflowCount: " << m_UnderflowCount << std::endl;
os << indent << "OverflowCount: " << m_OverflowCount << std::endl;
}
}// end namespace itk
#endif
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