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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkOtsuThresholdImageFilter.txx,v $
Language: C++
Date: $Date: 2006-08-01 19:16:16 $
Version: $Revision: 1.4 $
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 _itkOtsuThresholdImageFilter_txx
#define _itkOtsuThresholdImageFilter_txx
#include "itkOtsuThresholdImageFilter.h"
#include "itkBinaryThresholdImageFilter.h"
#include "itkOtsuThresholdImageCalculator.h"
#include "itkProgressAccumulator.h"
namespace itk {
template<class TInputImage, class TOutputImage>
OtsuThresholdImageFilter<TInputImage, TOutputImage>
::OtsuThresholdImageFilter()
{
m_OutsideValue = NumericTraits<OutputPixelType>::Zero;
m_InsideValue = NumericTraits<OutputPixelType>::max();
m_Threshold = NumericTraits<InputPixelType>::Zero;
m_NumberOfHistogramBins = 128;
}
template<class TInputImage, class TOutputImage>
void
OtsuThresholdImageFilter<TInputImage, TOutputImage>
::GenerateData()
{
typename ProgressAccumulator::Pointer progress = ProgressAccumulator::New();
progress->SetMiniPipelineFilter(this);
// Compute the Otsu Threshold for the input image
typename OtsuThresholdImageCalculator<TInputImage>::Pointer otsu =
OtsuThresholdImageCalculator<TInputImage>::New();
otsu->SetImage (this->GetInput());
otsu->SetNumberOfHistogramBins (m_NumberOfHistogramBins);
otsu->Compute();
m_Threshold = otsu->GetThreshold();
typename BinaryThresholdImageFilter<TInputImage,TOutputImage>::Pointer threshold =
BinaryThresholdImageFilter<TInputImage,TOutputImage>::New();
progress->RegisterInternalFilter(threshold,.5f);
threshold->GraftOutput (this->GetOutput());
threshold->SetInput (this->GetInput());
threshold->SetLowerThreshold(NumericTraits<InputPixelType>::NonpositiveMin());
threshold->SetUpperThreshold(otsu->GetThreshold());
threshold->SetInsideValue (m_InsideValue);
threshold->SetOutsideValue (m_OutsideValue);
threshold->Update();
this->GraftOutput(threshold->GetOutput());
}
template<class TInputImage, class TOutputImage>
void
OtsuThresholdImageFilter<TInputImage, TOutputImage>
::GenerateInputRequestedRegion()
{
TInputImage * input = const_cast<TInputImage *>(this->GetInput());
if( input )
{
input->SetRequestedRegionToLargestPossibleRegion();
}
}
template<class TInputImage, class TOutputImage>
void
OtsuThresholdImageFilter<TInputImage,TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "OutsideValue: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutsideValue) << std::endl;
os << indent << "InsideValue: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_InsideValue) << std::endl;
os << indent << "NumberOfHistogramBins: "
<< m_NumberOfHistogramBins << std::endl;
os << indent << "Threshold (computed): "
<< static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_Threshold) << std::endl;
}
}// end namespace itk
#endif
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