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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkOptSimpleContourExtractorImageFilter.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.
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 __itkOptSimpleContourExtractorImageFilter_txx
#define __itkOptSimpleContourExtractorImageFilter_txx
#include "itkConstNeighborhoodIterator.h"
#include "itkNeighborhoodInnerProduct.h"
#include "itkImageRegionIterator.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
#include "itkOffset.h"
#include "itkProgressReporter.h"
#include "itkSimpleContourExtractorImageFilter.h"
namespace itk
{
template <class TInputImage, class TOutputImage>
SimpleContourExtractorImageFilter<TInputImage, TOutputImage>
::SimpleContourExtractorImageFilter()
{
m_InputBackgroundValue = NumericTraits<InputPixelType>::Zero;
m_InputForegroundValue = NumericTraits<InputPixelType>::max();
m_OutputBackgroundValue = NumericTraits<OutputPixelType>::Zero;
m_OutputForegroundValue = NumericTraits<OutputPixelType>::max();
}
template< class TInputImage, class TOutputImage>
void
SimpleContourExtractorImageFilter< TInputImage, TOutputImage>
::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
int threadId)
{
unsigned int i;
ZeroFluxNeumannBoundaryCondition<InputImageType> nbc;
ConstNeighborhoodIterator<InputImageType> bit;
ImageRegionIterator<OutputImageType> it;
// Allocate output
typename OutputImageType::Pointer output = this->GetOutput();
typename InputImageType::ConstPointer input = this->GetInput();
// Find the data-set boundary "faces"
typename NeighborhoodAlgorithm::ImageBoundaryFacesCalculator<InputImageType>::FaceListType faceList;
NeighborhoodAlgorithm::ImageBoundaryFacesCalculator<InputImageType> bC;
faceList = bC(input, outputRegionForThread, this->GetRadius());
typename NeighborhoodAlgorithm::ImageBoundaryFacesCalculator<InputImageType>::FaceListType::iterator fit;
// support progress methods/callbacks
ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
// Process each of the boundary faces. These are N-d regions which border
// the edge of the buffer.
for (fit=faceList.begin(); fit != faceList.end(); ++fit)
{
bit = ConstNeighborhoodIterator<InputImageType>(this->GetRadius(),
input, *fit);
unsigned int neighborhoodSize = bit.Size();
it = ImageRegionIterator<OutputImageType>(output, *fit);
bit.OverrideBoundaryCondition(&nbc);
bit.GoToBegin();
bool bIsOnContour;
while ( ! bit.IsAtEnd() )
{
// first test
// if current pixel is not on, let's continue
if( bit.GetCenterPixel() == m_InputForegroundValue )
{
bIsOnContour = false;
for (i = 0; i < neighborhoodSize; ++i)
{
// second test if at least one neighbour pixel is off
// the center pixel belongs to contour
if( bit.GetPixel(i) == m_InputBackgroundValue )
{
bIsOnContour = true;
break;
}
}
// set pixel center pixel value weither it is or not on contour
if( bIsOnContour )
{
it.Set( m_OutputForegroundValue );
}
else
{
it.Set( m_OutputBackgroundValue );
}
}
else
{
it.Set( m_OutputBackgroundValue );
}
++bit;
++it;
progress.CompletedPixel();
}
}
}
/**
* Standard "PrintSelf" method
*/
template <class TInputImage, class TOutput>
void
SimpleContourExtractorImageFilter<TInputImage, TOutput>
::PrintSelf(
std::ostream& os,
Indent indent) const
{
Superclass::PrintSelf( os, indent );
os << indent << "Input Foreground Value: "
<< static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_InputForegroundValue) << std::endl;
os << indent << "Input Background Value: "
<< static_cast<typename NumericTraits<InputPixelType>::PrintType>(m_InputBackgroundValue) << std::endl;
os << indent << "Output Foreground Value: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutputForegroundValue) << std::endl;
os << indent << "Output Background Value: "
<< static_cast<typename NumericTraits<OutputPixelType>::PrintType>(m_OutputBackgroundValue) << std::endl;
}
} // end namespace itk
#endif
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