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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkThresholdImageFilter.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 __itkThresholdImageFilter_txx
#define __itkThresholdImageFilter_txx
#include "itkThresholdImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkNumericTraits.h"
#include "itkObjectFactory.h"
#include "itkProgressReporter.h"
namespace itk
{
/**
*
*/
template <class TImage>
ThresholdImageFilter<TImage>
::ThresholdImageFilter()
{
m_OutsideValue = NumericTraits<PixelType>::Zero;
m_Lower = NumericTraits<PixelType>::NonpositiveMin();
m_Upper = NumericTraits<PixelType>::max();
this->InPlaceOff();
}
/**
*
*/
template <class TImage>
void
ThresholdImageFilter<TImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "OutsideValue: "
<< static_cast<typename NumericTraits<PixelType>::PrintType>(m_OutsideValue)
<< std::endl;
os << indent << "Lower: "
<< static_cast<typename NumericTraits<PixelType>::PrintType>(m_Lower)
<< std::endl;
os << indent << "Upper: "
<< static_cast<typename NumericTraits<PixelType>::PrintType>(m_Upper)
<< std::endl;
}
/**
* The values greater than or equal to the value are set to OutsideValue
*/
template <class TImage>
void
ThresholdImageFilter<TImage>
::ThresholdAbove(const PixelType &thresh)
{
if (m_Upper != thresh
|| m_Lower > NumericTraits<PixelType>::NonpositiveMin())
{
m_Lower = NumericTraits<PixelType>::NonpositiveMin();
m_Upper = thresh;
this->Modified();
}
}
/**
* The values less than or equal to the value are set to OutsideValue
*/
template <class TImage>
void
ThresholdImageFilter<TImage>
::ThresholdBelow(const PixelType &thresh)
{
if (m_Lower != thresh || m_Upper < NumericTraits<PixelType>::max())
{
m_Lower = thresh;
m_Upper = NumericTraits<PixelType>::max();
this->Modified();
}
}
/**
* The values outside the range are set to OutsideValue
*/
template <class TImage>
void
ThresholdImageFilter<TImage>
::ThresholdOutside(const PixelType &lower, const PixelType &upper)
{
if (lower > upper)
{
itkExceptionMacro(<<"Lower threshold cannot be greater than upper threshold.");
return;
}
if (m_Lower != lower || m_Upper != upper)
{
m_Lower = lower;
m_Upper = upper;
this->Modified();
}
}
/**
*
*/
template <class TImage>
void
ThresholdImageFilter<TImage>
::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
int threadId)
{
itkDebugMacro(<<"Actually executing");
// Get the input and output pointers
InputImagePointer inputPtr = this->GetInput();
OutputImagePointer outputPtr = this->GetOutput(0);
// Define/declare an iterator that will walk the output region for this
// thread.
typedef ImageRegionConstIterator<TImage> InputIterator;
typedef ImageRegionIterator<TImage> OutputIterator;
InputIterator inIt(inputPtr, outputRegionForThread);
OutputIterator outIt(outputPtr, outputRegionForThread);
// support progress methods/callbacks
ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
// walk the regions, threshold each pixel
while( !outIt.IsAtEnd() )
{
const PixelType value = inIt.Get();
if (m_Lower <= value && value <= m_Upper)
{
// pixel passes to output unchanged and is replaced by m_OutsideValue in
// the inverse output image
outIt.Set( inIt.Get() );
}
else
{
outIt.Set( m_OutsideValue );
}
++inIt;
++outIt;
progress.CompletedPixel();
}
}
} // end namespace itk
#endif
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