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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkChangeLabelLabelMapFilter.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 __itkChangeLabelLabelMapFilter_txx
#define __itkChangeLabelLabelMapFilter_txx
#include "itkChangeLabelLabelMapFilter.h"
#include "itkProgressReporter.h"
#include <deque>
namespace itk {
template <class TImage>
ChangeLabelLabelMapFilter<TImage>
::ChangeLabelLabelMapFilter()
{
}
template <class TImage>
void
ChangeLabelLabelMapFilter<TImage>
::SetChangeMap( const ChangeMapType & changeMap )
{
if( m_MapOfLabelToBeReplaced != changeMap )
{
m_MapOfLabelToBeReplaced = changeMap;
this->Modified();
}
}
template <class TImage>
const typename ChangeLabelLabelMapFilter<TImage>::ChangeMapType &
ChangeLabelLabelMapFilter<TImage>
::GetChangeMap() const
{
return m_MapOfLabelToBeReplaced;
}
template <class TImage>
void
ChangeLabelLabelMapFilter<TImage>
::SetChange( const PixelType & oldLabel, const PixelType & newLabel )
{
if( m_MapOfLabelToBeReplaced.find( oldLabel ) == m_MapOfLabelToBeReplaced.end() ||
m_MapOfLabelToBeReplaced[ oldLabel ] != newLabel )
{
m_MapOfLabelToBeReplaced[ oldLabel ] = newLabel;
this->Modified();
}
}
template <class TImage>
void
ChangeLabelLabelMapFilter<TImage>
::ClearChangeMap()
{
if( !m_MapOfLabelToBeReplaced.empty() )
{
m_MapOfLabelToBeReplaced.clear();
this->Modified();
}
}
template <class TImage>
void
ChangeLabelLabelMapFilter<TImage>
::GenerateData()
{
// MoveLabelsToTemporaryArray
// Allocate the output
this->AllocateOutputs();
ImageType * output = this->GetOutput();
// Report the progress
ProgressReporter progress( this, 0, m_MapOfLabelToBeReplaced.size() * 2 );
// First remove the ones to change and store them elsewhere to process later
typedef typename LabelObjectType::Pointer LabelObjectPointer;
typedef std::deque< LabelObjectPointer > VectorType;
VectorType labelObjectsToBeRelabeled;
ChangeMapIterator pairToReplace = m_MapOfLabelToBeReplaced.begin();
while( pairToReplace != m_MapOfLabelToBeReplaced.end() )
{
const PixelType labelToBeReplaced = pairToReplace->first;
if( labelToBeReplaced != output->GetBackgroundValue() )
{
if( output->HasLabel( labelToBeReplaced ) )
{
labelObjectsToBeRelabeled.push_back( output->GetLabelObject( labelToBeReplaced ) );
output->RemoveLabel( labelToBeReplaced );
}
}
progress.CompletedPixel();
pairToReplace++;
}
// ChangeBackgroundIfNeeded
// Check if the background is among the list of labels to relabel.
ChangeMapIterator backgroundLabelItr = m_MapOfLabelToBeReplaced.find( output->GetBackgroundValue() );
const bool backgroundLabelMustBeReplaced = ( backgroundLabelItr != m_MapOfLabelToBeReplaced.end() );
// Then change the label of the background if needed
if( backgroundLabelMustBeReplaced )
{
const PixelType newLabelForBackground = m_MapOfLabelToBeReplaced[ output->GetBackgroundValue() ];
if( newLabelForBackground != output->GetBackgroundValue() )
{
if( output->HasLabel( newLabelForBackground ) )
{
// we must have a background - remove that object
output->RemoveLabel( newLabelForBackground );
}
output->SetBackgroundValue( newLabelForBackground );
}
}
// RestoreLabelObjectsAndChangeLabels
// Put the objects back in the map, with the updated label
typedef typename VectorType::iterator LabelObjectIterator;
LabelObjectIterator labelObjectItr = labelObjectsToBeRelabeled.begin();
while( labelObjectItr != labelObjectsToBeRelabeled.end() )
{
LabelObjectType * labelObjectSource = *labelObjectItr;
PixelType newLabel = m_MapOfLabelToBeReplaced[ labelObjectSource->GetLabel() ];
// Ignore the label if it is the background
if( newLabel != output->GetBackgroundValue() )
{
// If the new label already exists in the output, then merge them.
if( output->HasLabel( newLabel ) )
{
// Add the content of the label object to the one already there
LabelObjectType * labelObjectDestination = output->GetLabelObject( newLabel );
typedef typename LabelObjectType::LineContainerType LineContainerType;
const LineContainerType & lineContainer = labelObjectSource->GetLineContainer();
typename LineContainerType::const_iterator lineItr = lineContainer.begin();
while( lineItr != lineContainer.end() )
{
labelObjectDestination->AddLine( *lineItr );
++lineItr;
}
// be sure to have the lines well organized
labelObjectDestination->Optimize();
}
else
{
// just put the label object in the label map with the new label
labelObjectSource->SetLabel( newLabel );
output->AddLabelObject( labelObjectSource );
}
}
// go to the next label object
progress.CompletedPixel();
labelObjectItr++;
}
}
template <class TImage>
void
ChangeLabelLabelMapFilter<TImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
ChangeMapIterator pairToReplace = m_MapOfLabelToBeReplaced.begin();
typedef typename NumericTraits< PixelType >::PrintType LabelPrintType;
os << indent << "Labels to replace: " << std::endl;
while( pairToReplace != m_MapOfLabelToBeReplaced.end() )
{
const PixelType oldLabel = pairToReplace->first;
const PixelType newLabel = pairToReplace->second;
os << indent;
os << static_cast< LabelPrintType >( oldLabel ) << " -> ";
os << static_cast< LabelPrintType >( newLabel ) << std::endl;
++pairToReplace;
}
}
}// end namespace itk
#endif
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