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itkReinitializeLevelSetImageFilter.txx
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itkReinitializeLevelSetImageFilter.txx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkReinitializeLevelSetImageFilter.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 _itkReinitializeLevelSetImageFilter_txx
#define _itkReinitializeLevelSetImageFilter_txx
#include "itkReinitializeLevelSetImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkIndex.h"
namespace itk
{
/*
* Default constructor.
*/
template <class TLevelSet>
ReinitializeLevelSetImageFilter<TLevelSet>
::ReinitializeLevelSetImageFilter()
{
m_LevelSetValue = 0.0;
m_Locator = LocatorType::New();
m_Marcher = FastMarchingImageFilterType::New();
m_NarrowBanding = false;
m_InputNarrowBandwidth = 12.0;
m_OutputNarrowBandwidth = 12.0;
m_InputNarrowBand = NULL;
m_OutputNarrowBand = NULL;
}
/*
* Set the input narrowband container.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::SetInputNarrowBand(
NodeContainer * ptr )
{
if( m_InputNarrowBand != ptr )
{
m_InputNarrowBand = ptr;
this->Modified();
}
}
/*
* PrintSelf method.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Level set value: " << m_LevelSetValue << std::endl;
os << indent << "Narrowbanding: " << m_NarrowBanding << std::endl;
os << indent << "Input narrow bandwidth: " << m_InputNarrowBandwidth;
os << std::endl;
os << indent << "Output narrow bandwidth: " << m_OutputNarrowBandwidth;
os << std::endl;
os << indent << "Input narrow band: " << m_InputNarrowBand.GetPointer();
os << std::endl;
os << indent << "Output narrow band: " << m_OutputNarrowBand.GetPointer();
os << std::endl;
}
/*
* GenerateInputRequestedRegion method.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::GenerateInputRequestedRegion()
{
// use the default implementation.
this->Superclass::GenerateInputRequestedRegion();
}
/*
* EnlargeOutputRequestedRegion method.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::EnlargeOutputRequestedRegion(
DataObject *output )
{
// this filter requires the all of the output image to be in
// the buffer
TLevelSet *imgData;
imgData = dynamic_cast<TLevelSet*>( output );
if ( imgData )
{
imgData->SetRequestedRegionToLargestPossibleRegion();
}
else
{
// pointer could not be cast to TLevelSet *
itkWarningMacro(<< "itk::ReinitializeLevelSetImageFilter" <<
"::EnlargeOutputRequestedRegion cannot cast "
<< typeid(output).name() << " to "
<< typeid(TLevelSet*).name() );
}
}
/*
* Allocate/initialize memory.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::AllocateOutput()
{
LevelSetPointer outputPtr = this->GetOutput();
// allocate the output buffer memory
outputPtr->SetBufferedRegion(
outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
// set the marcher output size
m_Marcher->SetOutputSize(
outputPtr->GetRequestedRegion().GetSize() );
}
/*
* Generate the output data.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::GenerateData()
{
this->AllocateOutput();
if( m_NarrowBanding )
{
this->GenerateDataNarrowBand();
}
else
{
this->GenerateDataFull();
}
}
/*
* Generate the output data - full set version.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::GenerateDataFull()
{
LevelSetConstPointer inputPtr = this->GetInput();
LevelSetPointer outputPtr = this->GetOutput();
LevelSetPointer tempLevelSet = m_Marcher->GetOutput();
// define iterators
typedef
ImageRegionIterator<LevelSetImageType> IteratorType;
typedef
ImageRegionConstIterator<LevelSetImageType> ConstIteratorType;
ConstIteratorType inputIt( inputPtr,
inputPtr->GetBufferedRegion() );
IteratorType outputIt( outputPtr,
outputPtr->GetBufferedRegion() );
IteratorType tempIt;
this->UpdateProgress( 0.0 );
// locate the level set
m_Locator->SetInputLevelSet( inputPtr );
m_Locator->SetLevelSetValue( m_LevelSetValue );
m_Locator->Locate();
this->UpdateProgress( 0.33 );
// march outward
m_Marcher->SetTrialPoints( m_Locator->GetOutsidePoints() );
m_Marcher->Update();
tempIt = IteratorType( tempLevelSet,
tempLevelSet->GetBufferedRegion() );
double value;
while( !inputIt.IsAtEnd() )
{
value = (double) inputIt.Get();
if( value - m_LevelSetValue > 0 )
{
outputIt.Set( tempIt.Get() );
}
++inputIt;
++outputIt;
++tempIt;
}
this->UpdateProgress( 0.66 );
// march inward
m_Marcher->SetTrialPoints( m_Locator->GetInsidePoints() );
m_Marcher->Update();
inputIt.GoToBegin();
outputIt.GoToBegin();
tempIt.GoToBegin();
while( !inputIt.IsAtEnd() )
{
value = (double) inputIt.Get();
if( value - m_LevelSetValue <= 0 )
{
value = (double) tempIt.Get();
outputIt.Set( -1.0 * value );
}
++inputIt;
++outputIt;
++tempIt;
}
}
/*
* Generate output data - narrowband version.
*/
template <class TLevelSet>
void
ReinitializeLevelSetImageFilter<TLevelSet>
::GenerateDataNarrowBand()
{
LevelSetConstPointer inputPtr = this->GetInput();
LevelSetPointer outputPtr = this->GetOutput();
LevelSetPointer tempLevelSet = m_Marcher->GetOutput();
// define iterators
typedef
ImageRegionIterator<LevelSetImageType> IteratorType;
typedef
ImageRegionConstIterator<LevelSetImageType> ConstIteratorType;
ConstIteratorType inputIt( inputPtr,
inputPtr->GetBufferedRegion() );
IteratorType outputIt( outputPtr,
outputPtr->GetBufferedRegion() );
PixelType posInfinity;
PixelType negInfinity;
posInfinity = NumericTraits<PixelType>::max();
negInfinity = NumericTraits<PixelType>::NonpositiveMin();
// set all internal pixels to minus infinity and
// all external pixels to positive infinity
double value;
while( !inputIt.IsAtEnd() )
{
value = (double) inputIt.Get();
if( value - m_LevelSetValue <= 0 )
{
outputIt.Set( negInfinity );
}
else
{
outputIt.Set( posInfinity );
}
++inputIt;
++outputIt;
}
// create a new output narrowband container
m_OutputNarrowBand = NodeContainer::New();
this->UpdateProgress( 0.0 );
// locate the level set
m_Locator->SetInputLevelSet( inputPtr );
m_Locator->SetLevelSetValue( m_LevelSetValue );
if( m_NarrowBanding && m_InputNarrowBand )
{
m_Locator->NarrowBandingOn();
m_Locator->SetNarrowBandwidth( m_InputNarrowBandwidth );
m_Locator->SetInputNarrowBand( m_InputNarrowBand );
}
else
{
m_Locator->NarrowBandingOff();
}
m_Locator->Locate();
this->UpdateProgress( 0.33 );
// march outward
double stoppingValue = ( m_OutputNarrowBandwidth / 2.0 ) + 2.0;
m_Marcher->SetStoppingValue( stoppingValue );
m_Marcher->CollectPointsOn();
m_Marcher->SetTrialPoints( m_Locator->GetOutsidePoints() );
m_Marcher->Update();
NodeContainerPointer procPoints = m_Marcher->GetProcessedPoints();
typename NodeContainer::ConstIterator pointsIt;
typename NodeContainer::ConstIterator pointsEnd;
pointsIt = procPoints->Begin();
pointsEnd = procPoints->End();
NodeType node;
PixelType inPixel;
for( ; pointsIt != pointsEnd; ++pointsIt )
{
node = pointsIt.Value();
inPixel = inputPtr->GetPixel( node.GetIndex() );
value = (double) inPixel;
if( value - m_LevelSetValue > 0 )
{
inPixel = tempLevelSet->GetPixel( node.GetIndex() );
outputPtr->SetPixel( node.GetIndex(), inPixel );
m_OutputNarrowBand->InsertElement( m_OutputNarrowBand->Size(), node );
}
} // end for loop
this->UpdateProgress( 0.66 );
// march inward
m_Marcher->SetTrialPoints( m_Locator->GetInsidePoints() );
m_Marcher->Update();
procPoints = m_Marcher->GetProcessedPoints();
pointsIt = procPoints->Begin();
pointsEnd = procPoints->End();
for( ; pointsIt != pointsEnd; ++pointsIt )
{
node = pointsIt.Value();
inPixel = inputPtr->GetPixel( node.GetIndex() );
value = (double) inPixel ;
if( value - m_LevelSetValue <= 0 )
{
inPixel = tempLevelSet->GetPixel( node.GetIndex() );
value = (double) inPixel;
inPixel = -1.0 * value;
outputPtr->SetPixel( node.GetIndex(), inPixel );
node.SetValue( node.GetValue() * -1.0 );
m_OutputNarrowBand->InsertElement( m_OutputNarrowBand->Size(), node );
}
} // end for loop
}
} // namespace itk
#endif