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itkKLMSegmentationRegion.cxx
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itkKLMSegmentationRegion.cxx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkKLMSegmentationRegion.cxx
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.
=========================================================================*/
#include "itkKLMSegmentationRegion.h"
namespace itk
{
KLMSegmentationRegion
::KLMSegmentationRegion( void )
{
m_MeanRegionIntensity = 0;
}
KLMSegmentationRegion
::~KLMSegmentationRegion()
{
}
void
KLMSegmentationRegion
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Mean region intensity : " << m_MeanRegionIntensity <<
std::endl;
os << indent << "Region border object" << std::endl;
} // end PrintSelf
void
KLMSegmentationRegion
::SetRegionParameters( MeanRegionIntensityType meanRegionIntensity,
double regionArea,
RegionLabelType label )
{
// Set the area, mean, and label associated with the region
this->SetRegionArea( regionArea );
this->SetMeanRegionIntensity( meanRegionIntensity );
this->SetRegionLabel( label );
} // end SetRegionParameters
void
KLMSegmentationRegion
::CombineRegionParameters( const Self *region )
{
// Reset the area and mean associated with the merged region
MeanRegionIntensityType region1Mean = this->GetMeanRegionIntensity();
MeanRegionIntensityType region2Mean = region->GetMeanRegionIntensity();
double region1Area = this->GetRegionArea();
double region2Area = region->GetRegionArea();
double mergedRegionArea = region1Area + region2Area;
MeanRegionIntensityType mergedRegionMean =
region1Mean * region1Area + region2Mean * region2Area;
if ( mergedRegionArea <= 0 ) itkExceptionMacro( << "Invalid region area" );
mergedRegionMean /= mergedRegionArea;
this->SetRegionArea( mergedRegionArea );
this->SetMeanRegionIntensity( mergedRegionMean );
} // end CombineRegionParameters
double
KLMSegmentationRegion
::EnergyFunctional(const Self *region)
{
MeanRegionIntensityType region1_2MeanDiff =
this->m_MeanRegionIntensity - region->m_MeanRegionIntensity;
// Assuming equal weights to all the channels
// FIXME: For different channel weights modify this part of the code.
double cost = region1_2MeanDiff.squared_magnitude();
double region1Area = this->GetRegionArea();
double region2Area = region->GetRegionArea();
double scaleArea = ( region1Area * region2Area ) /
( region1Area + region2Area );
return scaleArea * cost;
}
void
KLMSegmentationRegion
::DeleteRegionBorder( KLMSegmentationBorder *pBorderCandidate )
{
if( pBorderCandidate == NULL )
{
itkExceptionMacro( << "Null pointer to segmentation region border" );
}
RegionBorderVectorIterator
regionBorderVectorIt = m_RegionBorderVector.begin();
RegionBorderVectorIterator
regionBorderVectorItEnd = m_RegionBorderVector.end();
// Erase the region border that matches the pBorderCandidate
bool foundBorderCandidate = false;
while( regionBorderVectorIt != regionBorderVectorItEnd )
{
if ( *regionBorderVectorIt == pBorderCandidate )
{
m_RegionBorderVector.erase( regionBorderVectorIt );
foundBorderCandidate = true;
break;
}
++regionBorderVectorIt;
}
if ( !foundBorderCandidate )
{
itkExceptionMacro(<< "Border candidate not in region borders list" );
}
} // end DeleteRegionBorder()
void
KLMSegmentationRegion
::PushBackRegionBorder( KLMSegmentationBorder *pBorderCandidate )
{
if( pBorderCandidate == NULL )
{
itkExceptionMacro( << "Null pointer to segmentation region border" );
}
m_RegionBorderVector.push_back( pBorderCandidate );
}
void
KLMSegmentationRegion
::PushFrontRegionBorder( KLMSegmentationBorder *pBorderCandidate )
{
if( pBorderCandidate == NULL )
{
itkExceptionMacro( << "Null pointer to segmentation region border" );
}
m_RegionBorderVector.insert( m_RegionBorderVector.begin(), pBorderCandidate );
}
void
KLMSegmentationRegion
::InsertRegionBorder( KLMSegmentationBorder *pBorderCandidate )
{
// Ensure that the border candidate is not a null pointer
if( pBorderCandidate == NULL )
{
itkExceptionMacro( << "Null pointer to segmentation region border" );
}
// The m_RegionBorderVec is a ordered vector of pointers to the borders.
// Ordering is based on regions labels.
// The region border vector is empty, there is only one region border
if( m_RegionBorderVector.empty() )
{
m_RegionBorderVector.push_back( pBorderCandidate );
}
// There are many region borders
else
{
// Iterator set to the first element of the region border element
RegionBorderVectorIterator
regionBorderVectorIt = m_RegionBorderVector.begin();
RegionBorderVectorIterator
regionBorderVectorItEnd = m_RegionBorderVector.end();
bool insertAtEnd = true;
while( regionBorderVectorIt != regionBorderVectorItEnd )
{
// The region border should be inserted.
if ( ( pBorderCandidate->GetRegion1()->GetRegionLabel() <
(*regionBorderVectorIt)->GetRegion1()->GetRegionLabel() ) ||
( pBorderCandidate->GetRegion1()->GetRegionLabel() ==
(*regionBorderVectorIt)->GetRegion1()->GetRegionLabel() &&
pBorderCandidate->GetRegion2()->GetRegionLabel() <
(*regionBorderVectorIt)->GetRegion2()->GetRegionLabel() ) )
{
m_RegionBorderVector.insert(regionBorderVectorIt,pBorderCandidate);
insertAtEnd = false;
break;
} // end of if
++regionBorderVectorIt;
} // end of while
// It should be inserted at the end
if( insertAtEnd )
{
m_RegionBorderVector.push_back( pBorderCandidate );
}
} // end of else for the case with many region borders
} // end InsertRegionBorder
void
KLMSegmentationRegion
::InsertRegionBorder(RegionBorderVectorIterator RegionBorderVectorIt,
KLMSegmentationBorder *pBorderCandidate )
{
// Ensure that the border candidate is not a null pointer
if( pBorderCandidate == NULL )
{
itkExceptionMacro( << "Null pointer to segmentation region border" );
}
// The m_RegionBorderVec is a ordered vector of pointers to the
// borders. Insert a valid region border into the region border vector
// assuming calling function has correctly identified the new
// element position.
m_RegionBorderVector.insert( RegionBorderVectorIt, pBorderCandidate );
} // end InsertRegionBorder
void
KLMSegmentationRegion
::ResetRegionLabelAndUpdateBorders( Self *region )
{
// Assign new equivalence label to the old region
this->SetRegionLabel( region->GetRegionLabel() );
// Update the region borders
RegionBorderVectorIterator
oldRegionBordersIt = this->GetRegionBorderItBegin();
RegionBorderVectorIterator
endOfOldRegionBorders = this->GetRegionBorderItEnd();
// Ensure that all borders associated with the old region
// are in the correct order
while ( oldRegionBordersIt != endOfOldRegionBorders )
{
// Make sure the neighbors now point to the new region, and
// reorder the region borders of the neighbors since they are
// no longer in ascending order
// Ensure that region 1 label is less than region 2 label
if( (*oldRegionBordersIt)->GetRegion1()->GetRegionLabel() ==
(*oldRegionBordersIt)->GetRegion2()->GetRegionLabel() )
{
itkExceptionMacro( << "Invalid region border list" );
}
// Correct order
if ( (*oldRegionBordersIt)->GetRegion1()->GetRegionLabel() >
(*oldRegionBordersIt)->GetRegion2()->GetRegionLabel() )
{
// Swap the regions pointed to by the border
KLMSegmentationRegion *ptmpRegion = (*oldRegionBordersIt)->GetRegion1();
(*oldRegionBordersIt)->SetRegion1( (*oldRegionBordersIt)->GetRegion2() );
(*oldRegionBordersIt)->SetRegion2( ptmpRegion );
} // end if (correct order)
// Point to the newly merged region, and since the region labels
// have been switched (if the region 1 label of a border is found to be
// greater than the corresponding region 2 label), the list of borders for
// the neighbor region has changed.
// The border's region1 is the neighbor
if ( (*oldRegionBordersIt)->GetRegion2() == this )
{
// Make the border's region 2 point to the new region
(*oldRegionBordersIt)->SetRegion2( region );
// Reorder the region borders of the neighbor:
// remove the region border, then re-insert it.
(*oldRegionBordersIt)->GetRegion1()
->DeleteRegionBorder( *oldRegionBordersIt );
(*oldRegionBordersIt)->GetRegion1()
->InsertRegionBorder( *oldRegionBordersIt );
} // end if (the border's region1 is the neighbor)
// The border's region2 is the neighbor
else if ( (*oldRegionBordersIt)->GetRegion1() == this )
{
// Make the border's region 1 point to the new region
(*oldRegionBordersIt)->SetRegion1( region );
// Reorder the region borders of the neighbor
// remove the region border, then re-insert it
(*oldRegionBordersIt)->GetRegion2()
->DeleteRegionBorder( *oldRegionBordersIt );
(*oldRegionBordersIt)->GetRegion2()
->InsertRegionBorder( *oldRegionBordersIt );
} // end else if (the border's region2 is the neighbor)
else
{
itkExceptionMacro( << "Invalid region border list" );
} // end else
// Go to the next region border pointed by the iterator
++oldRegionBordersIt;
} // end while
} // end ResetRegionLabelAndUpdateBorders
void
KLMSegmentationRegion
::SpliceRegionBorders( Self *region )
{
// Do the actual union of the borders
// Copy the container into a temp variable to avoid iterator confusion
RegionBorderVectorType thisRegionBorder = m_RegionBorderVector;
// clear output
m_RegionBorderVector.resize( 0 );
// Initialize the region iterators
RegionBorderVectorConstIterator
thisRegionBordersIt = thisRegionBorder.begin();
RegionBorderVectorConstIterator
endOfThisRegionBorders = thisRegionBorder.end();
RegionBorderVectorConstIterator
thatRegionBordersIt = region->GetRegionBorderConstItBegin();
RegionBorderVectorConstIterator
endOfThatRegionBorders = region->GetRegionBorderConstItEnd();
// Merge the two sets of region borders into the newly merged region
while ( ( thisRegionBordersIt != endOfThisRegionBorders ) &&
( thatRegionBordersIt != endOfThatRegionBorders ) )
{
// Ensure that there are no common borders in the new region
if( ( (*thisRegionBordersIt)->GetRegion1() ==
(*thisRegionBordersIt)->GetRegion2() ) ||
( (*thatRegionBordersIt)->GetRegion1() ==
(*thatRegionBordersIt)->GetRegion2() ) ||
( (*thisRegionBordersIt) == (*thatRegionBordersIt) ) )
{
itkExceptionMacro( << "Invalid region border list" );
}
// The two borders point to the same regions: DUPLICATE case.
// They must be merged into one border, and any reference to
// to the duplicate border must be purged.
if ( ( (*thisRegionBordersIt)->GetRegion1() ==
(*thatRegionBordersIt)->GetRegion1() ) &&
( (*thisRegionBordersIt)->GetRegion2() ==
(*thatRegionBordersIt)->GetRegion2() ) )
{
// Add the lengths of the borders
double newLength = (*thatRegionBordersIt)->GetBorderLength() +
(*thisRegionBordersIt)->GetBorderLength();
(*thisRegionBordersIt)->SetBorderLength( newLength );
m_RegionBorderVector.push_back( *thisRegionBordersIt );
// The border's region1 is the neighbor
if ( (*thatRegionBordersIt)->GetRegion2() == this )
{
(*thatRegionBordersIt)->GetRegion1()
->DeleteRegionBorder( (*thatRegionBordersIt) );
} // end if (the border's region1 is the neighbor )
// The border's region2 is the neighbor
else if ( (*thatRegionBordersIt)->GetRegion1() == this )
{
(*thatRegionBordersIt)->GetRegion2()
->DeleteRegionBorder( *thatRegionBordersIt );
} // end else if (the border's region2 is the neighbor )
else
{
itkExceptionMacro( << "Invalid region border list" );
} // end else
// Nullify the duplicate border so it can be identified and removed.
(*thatRegionBordersIt)->SetRegion1( NULL );
(*thatRegionBordersIt)->SetRegion2( NULL );
(*thatRegionBordersIt)->SetLambda( -1.0 );
thisRegionBordersIt++;
thatRegionBordersIt++;
} // end if loop for case when two borders point to same region
// This neighbor region label is less then that neighbor region label
else if ( ( (*thisRegionBordersIt)->GetRegion1()->GetRegionLabel() <
(*thatRegionBordersIt)->GetRegion1()->GetRegionLabel() ) ||
( ( (*thisRegionBordersIt)->GetRegion1()->GetRegionLabel() ==
(*thatRegionBordersIt)->GetRegion1()->GetRegionLabel() ) &&
( (*thisRegionBordersIt)->GetRegion2()->GetRegionLabel() <
(*thatRegionBordersIt)->GetRegion2()->GetRegionLabel() ) ) )
{
m_RegionBorderVector.push_back( *thisRegionBordersIt );
thisRegionBordersIt++;
} // end else if
// That neighbor region label is less then this neighbor region label
else if ( ( (*thatRegionBordersIt)->GetRegion1()->GetRegionLabel() <
(*thisRegionBordersIt)->GetRegion1()->GetRegionLabel() ) ||
( ( (*thatRegionBordersIt)->GetRegion1()->GetRegionLabel() ==
(*thisRegionBordersIt)->GetRegion1()->GetRegionLabel() ) &&
( (*thatRegionBordersIt)->GetRegion2()->GetRegionLabel() <
(*thisRegionBordersIt)->GetRegion2()->GetRegionLabel() ) ) )
{
m_RegionBorderVector.push_back( *thatRegionBordersIt );
thatRegionBordersIt++;
} // end else if
else
{
itkExceptionMacro( << "Invalid region border" );
} // end else
} // end of while
// If any borders remain in thisRegionBordersIt, put them in the back
while ( thisRegionBordersIt != endOfThisRegionBorders )
{
m_RegionBorderVector.push_back( *thisRegionBordersIt );
thisRegionBordersIt++;
}
// If any borders remain in thatRegionBorders, put them to the back
while ( thatRegionBordersIt != endOfThatRegionBorders )
{
m_RegionBorderVector.push_back( *thatRegionBordersIt );
thatRegionBordersIt++;
}
} // end SpliceRegionBorders
void
KLMSegmentationRegion
::UpdateRegionBorderLambda()
{
// Check if the number of borders for this region is NULL
if( m_RegionBorderVector.empty() )
{
itkExceptionMacro(<< "The region border for computing Lambda is NULL" );
}
// Set up the iterator to loop through the region border vector
RegionBorderVectorIterator
regionBorderVectorIt = m_RegionBorderVector.begin();
RegionBorderVectorIterator
regionBorderVectorItEnd = m_RegionBorderVector.end();
// Loop through the entire border list and update the Lambda values
while( regionBorderVectorIt != regionBorderVectorItEnd )
{
(*regionBorderVectorIt)->EvaluateLambda();
++regionBorderVectorIt;
} // End while loop
} // end UpdateRegionBorderLambda
void
KLMSegmentationRegion
::DeleteAllRegionBorders()
{
m_RegionBorderVector.resize( 0 );
} // end DeleteAllRegionBorders
KLMSegmentationRegion::RegionBorderVectorIterator
KLMSegmentationRegion
::GetRegionBorderItBegin()
{
return m_RegionBorderVector.begin();
} // end GetRegionBorderItBegin
KLMSegmentationRegion::RegionBorderVectorConstIterator
KLMSegmentationRegion
::GetRegionBorderConstItBegin()
{
return m_RegionBorderVector.begin();
} // end GetRegionBorderConstItBegin
KLMSegmentationRegion::RegionBorderVectorIterator
KLMSegmentationRegion
::GetRegionBorderItEnd()
{
return m_RegionBorderVector.end();
} // end GetRegionBorderItEnd
KLMSegmentationRegion::RegionBorderVectorConstIterator
KLMSegmentationRegion
::GetRegionBorderConstItEnd()
{
return m_RegionBorderVector.end();
} // end GetRegionBorderConstItEnd
KLMSegmentationRegion::RegionBorderVectorSizeType
KLMSegmentationRegion
::GetRegionBorderSize() const
{
return m_RegionBorderVector.size();
} // end GetRegionBorderSize
void
KLMSegmentationRegion
::PrintRegionInfo()
{
int region1label;
int region2label;
// If there are border pointers print the results
RegionBorderVectorIterator tempVectorIt;
std::cout << "------------------------------" << std::endl;
std::cout << "Location : " << this << std::endl;
std::cout << "Label : " << (this->GetRegionLabel()) << std::endl;
std::cout << "Area : " << (this->GetRegionArea()) << std::endl;
std::cout << "Mean : " << (this->GetMeanRegionIntensity()) << std::endl;
std::cout << "Num Borders: " << static_cast<int>( m_RegionBorderVector.size() ) << std::endl;
std::cout << "++++++++++++++++++++++++++++++" << std::endl;
// If there are border pointers print the results
tempVectorIt = m_RegionBorderVector.begin();
for( unsigned int k = 0; k < m_RegionBorderVector.size(); k++ )
{
region1label = (*tempVectorIt)->GetRegion1()->GetRegionLabel();
region2label = (*tempVectorIt)->GetRegion2()->GetRegionLabel();
std::cout << "Border Ptr :" << (*tempVectorIt) << "( " <<
region1label << " - " << region2label << " )" << " Lambda = " <<
(*tempVectorIt)->GetLambda() << std::endl;
tempVectorIt++;
} // end for
std::cout << "------------------------------" << std::endl;
} //end PrintRegionInfo
} // namespace itk