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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkLevelSetDomainMapImageFilter_hxx
#define itkLevelSetDomainMapImageFilter_hxx
#include "itkLevelSetDomainMapImageFilter.h"
namespace itk
{
template < typename TInputImage, typename TOutputImage >
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >
::LevelSetDomainMapImageFilter()
{
this->Superclass::SetNumberOfRequiredInputs ( 1 );
this->Superclass::SetNumberOfRequiredOutputs ( 1 );
this->m_InputImage = ITK_NULLPTR;
this->m_OutputImage = ITK_NULLPTR;
}
template < typename TInputImage, typename TOutputImage >
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >
::~LevelSetDomainMapImageFilter()
{
}
template < typename TInputImage, typename TOutputImage >
const typename LevelSetDomainMapImageFilter< TInputImage, TOutputImage >::DomainMapType &
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >
::GetDomainMap() const
{
return this->m_DomainMap;
}
template < typename TInputImage, typename TOutputImage >
typename LevelSetDomainMapImageFilter< TInputImage, TOutputImage >::InputImageRegionType
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >
::ComputeConsistentRegion( const InputImageRegionType & inputRegion ) const
{
bool regionWasModified = false;
InputImageRegionType subRegion = inputRegion;
do
{
regionWasModified = false;
InputConstIteratorType iIt( this->m_InputImage, subRegion );
OutputConstIteratorType oIt( this->m_OutputImage, subRegion );
iIt.GoToBegin();
oIt.GoToBegin();
const InputImagePixelType firstCornerPixelValue = iIt.Get();
const InputImageIndexType & firstCornerIndex = iIt.GetIndex();
while( !iIt.IsAtEnd() )
{
const OutputImagePixelType segmentPixel = oIt.Get();
const InputImagePixelType nextPixel = iIt.Get();
if ( ( nextPixel != firstCornerPixelValue ) ||
( segmentPixel != NumericTraits< OutputImagePixelType >::ZeroValue() ) )
{
const InputImageIndexType & stopIdx = iIt.GetIndex();
InputImageSizeType sizeOfRegion;
for( unsigned int i = 0; i < ImageDimension; i++ )
{
sizeOfRegion[i] = stopIdx[i] - firstCornerIndex[i] + 1;
}
subRegion.SetSize(sizeOfRegion);
regionWasModified = true;
break;
}
++iIt;
++oIt;
}
}
while( regionWasModified );
return subRegion;
}
template < typename TInputImage, typename TOutputImage >
void
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >::
GenerateData()
{
// Clear any prior contents.
this->m_DomainMap.clear();
this->m_InputImage = this->GetInput();
const InputImageRegionType & region = this->m_InputImage->GetLargestPossibleRegion();
const InputImageSizeType size = region.GetSize();
this->m_OutputImage = this->GetOutput();
this->m_OutputImage->SetBufferedRegion( region );
this->m_OutputImage->Allocate();
this->m_OutputImage->FillBuffer( NumericTraits< OutputImagePixelType >::ZeroValue() );
InputImageIndexType end;
for( unsigned int i = 0; i < ImageDimension; i++ )
{
end[i] = size[i] - 1;
}
IdentifierType segmentId = NumericTraits<IdentifierType>::OneValue();
InputConstIteratorType iIt( this->m_InputImage, region );
OutputIndexIteratorType oIt( this->m_OutputImage, region );
iIt.GoToBegin();
oIt.GoToBegin();
while( !iIt.IsAtEnd() )
{
const InputImageIndexType & startIdx = iIt.GetIndex();
InputImageIndexType stopIdx = startIdx;
const InputImagePixelType & inputPixel = iIt.Get();
const OutputImagePixelType & outputPixel = oIt.Get();
// outputPixel is null when it has not been processed yet,
// or there is nothing to be processed
if ( ( !inputPixel.empty() ) && ( outputPixel == NumericTraits<OutputImagePixelType>::ZeroValue() ) )
{
InputImageRegionType subRegion;
InputImageSizeType sizeOfRegion;
for( unsigned int i = 0; i < ImageDimension; i++ )
{
bool sameOverlappingLevelSetIds = true;
stopIdx = startIdx;
while ( ( sameOverlappingLevelSetIds ) && ( stopIdx[i] <= end[i] ) )
{
const InputImagePixelType & nextPixel = this->m_InputImage->GetPixel( stopIdx );
const OutputImagePixelType & currentOutputPixel = this->m_OutputImage->GetPixel( stopIdx );
// Check if the input list pixels are different, or
// the output image already has been assigned to another region
if ( ( nextPixel != inputPixel ) ||
( currentOutputPixel != NumericTraits< OutputImagePixelType >::ZeroValue() ) )
{
sameOverlappingLevelSetIds = false;
}
else
{
++stopIdx[i];
}
}
sizeOfRegion[i] = stopIdx[i] - startIdx[i];
}
subRegion.SetSize( sizeOfRegion );
subRegion.SetIndex( startIdx );
// Compute the consistent subregion
subRegion = this->ComputeConsistentRegion( subRegion );
this->m_DomainMap[segmentId] = LevelSetDomain( subRegion, inputPixel );
OutputIndexIteratorType ooIt( this->m_OutputImage, subRegion );
ooIt.GoToBegin();
while( !ooIt.IsAtEnd() )
{
ooIt.Set( segmentId );
++ooIt;
}
++segmentId;
}
++iIt;
++oIt;
}
}
template < typename TInputImage, typename TOutputImage >
void
LevelSetDomainMapImageFilter< TInputImage, TOutputImage >::
PrintSelf ( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf ( os,indent );
os << indent << "DomainMap size: " << this->m_DomainMap.size() << std::endl;
}
} /* end namespace itk */
#endif
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