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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkLabelImageToLabelMapFilter.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 __itkLabelImageToLabelMapFilter_txx
#define __itkLabelImageToLabelMapFilter_txx
#include "itkLabelImageToLabelMapFilter.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
#include "itkImageLinearConstIteratorWithIndex.h"
namespace itk {
template <class TInputImage, class TOutputImage>
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::LabelImageToLabelMapFilter()
{
m_BackgroundValue = NumericTraits<OutputImagePixelType>::NonpositiveMin();
}
template <class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::GenerateInputRequestedRegion()
{
// call the superclass' implementation of this method
Superclass::GenerateInputRequestedRegion();
// We need all the input.
InputImagePointer input = const_cast<InputImageType *>(this->GetInput());
if ( !input )
{ return; }
input->SetRequestedRegion( input->GetLargestPossibleRegion() );
}
template <class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::EnlargeOutputRequestedRegion(DataObject *)
{
this->GetOutput()
->SetRequestedRegion( this->GetOutput()->GetLargestPossibleRegion() );
}
template<class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::BeforeThreadedGenerateData()
{
// init the temp images - one per thread
m_TemporaryImages.resize( this->GetNumberOfThreads() );
for( int i=0; i<this->GetNumberOfThreads(); i++ )
{
if( i == 0 )
{
// the first one is the output image
m_TemporaryImages[0] = this->GetOutput();
}
else
{
// the other must be created
m_TemporaryImages[i] = OutputImageType::New();
}
// set the minimum data needed to create the objects properly
m_TemporaryImages[i]->SetBackgroundValue( m_BackgroundValue );
}
}
template<class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::ThreadedGenerateData( const OutputImageRegionType& regionForThread, int threadId )
{
ProgressReporter progress( this, threadId, regionForThread.GetNumberOfPixels() );
typedef ImageLinearConstIteratorWithIndex< InputImageType > InputLineIteratorType;
InputLineIteratorType it( this->GetInput(), regionForThread );
it.SetDirection(0);
for( it.GoToBegin(); !it.IsAtEnd(); it.NextLine() )
{
it.GoToBeginOfLine();
while( !it.IsAtEndOfLine() )
{
const InputImagePixelType & v = it.Get();
if( v != m_BackgroundValue )
{
// We've hit the start of a run
IndexType idx = it.GetIndex();
long length=1;
++it;
while( !it.IsAtEndOfLine() && it.Get() == v )
{
++length;
++it;
}
// create the run length object to go in the vector
m_TemporaryImages[threadId]->SetLine( idx, length, v );
}
else
{
// go the the next pixel
++it;
}
}
}
}
template<class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::AfterThreadedGenerateData()
{
OutputImageType * output = this->GetOutput();
// merge the lines from the temporary images in the output image
// don't use the first image - that's the output image
for( int i=1; i<this->GetNumberOfThreads(); i++ )
{
typedef typename OutputImageType::LabelObjectContainerType LabelObjectContainerType;
const LabelObjectContainerType & labelObjectContainer = m_TemporaryImages[i]->GetLabelObjectContainer();
for( typename LabelObjectContainerType::const_iterator it = labelObjectContainer.begin();
it != labelObjectContainer.end();
it++ )
{
LabelObjectType * labelObject = it->second;
if( output->HasLabel( labelObject->GetLabel() ) )
{
// merge the lines in the output's object
typename LabelObjectType::LineContainerType & src = labelObject->GetLineContainer();
typename LabelObjectType::LineContainerType & dest = output->GetLabelObject( labelObject->GetLabel() )->GetLineContainer();
dest.insert( dest.end(), src.begin(), src.end() );
}
else
{
// simply take the object
output->AddLabelObject( labelObject );
}
}
}
// release the data in the temp images
m_TemporaryImages.clear();
}
template<class TInputImage, class TOutputImage>
void
LabelImageToLabelMapFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream &os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "BackgroundValue: " << static_cast<typename NumericTraits<OutputImagePixelType>::PrintType>(m_BackgroundValue) << std::endl;
}
}// end namespace itk
#endif
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