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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkFloodFilledFunctionConditionalConstIterator.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:35 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef _itkFloodFilledFunctionConditionalConstIterator_txx |
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#define _itkFloodFilledFunctionConditionalConstIterator_txx |
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#include "itkFloodFilledFunctionConditionalConstIterator.h" |
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#include "itkImageRegionConstIterator.h" |
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namespace itk |
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{ |
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template<class TImage, class TFunction> |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::FloodFilledFunctionConditionalConstIterator(const ImageType *imagePtr, |
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FunctionType *fnPtr, |
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IndexType startIndex) |
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{ |
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this->m_Image = imagePtr; |
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m_Function = fnPtr; |
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m_StartIndices.push_back ( startIndex ); |
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// Set up the temporary image |
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this->InitializeIterator(); |
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} |
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template<class TImage, class TFunction> |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::FloodFilledFunctionConditionalConstIterator(const ImageType *imagePtr, |
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FunctionType *fnPtr, |
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std::vector<IndexType>& startIndex) |
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{ |
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this->m_Image = imagePtr; |
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m_Function = fnPtr; |
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unsigned int i; |
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for (i = 0; i < startIndex.size(); i++ ) |
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{ |
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m_StartIndices.push_back ( startIndex[i] ); |
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} |
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// Set up the temporary image |
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this->InitializeIterator(); |
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} |
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template<class TImage, class TFunction> |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::FloodFilledFunctionConditionalConstIterator(const ImageType *imagePtr, |
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FunctionType *fnPtr) |
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{ |
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this->m_Image = imagePtr; |
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m_Function = fnPtr; |
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// Set up the temporary image |
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this->InitializeIterator(); |
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} |
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template<class TImage, class TFunction> |
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void |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::InitializeIterator() |
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{ |
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// Get the origin and spacing from the image in simple arrays |
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m_ImageOrigin = this->m_Image->GetOrigin(); |
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m_ImageSpacing = this->m_Image->GetSpacing(); |
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m_ImageRegion = this->m_Image->GetBufferedRegion(); |
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// Build a temporary image of chars for use in the flood algorithm |
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tempPtr = TTempImage::New(); |
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typename TTempImage::RegionType tempRegion = this->m_Image->GetBufferedRegion(); |
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tempPtr->SetLargestPossibleRegion( tempRegion ); |
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tempPtr->SetBufferedRegion( tempRegion ); |
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tempPtr->SetRequestedRegion( tempRegion ); |
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tempPtr->Allocate(); |
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tempPtr->FillBuffer(NumericTraits<ITK_TYPENAME TTempImage::PixelType>::Zero); |
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// Initialize the queue by adding the start index assuming one of |
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// the m_StartIndices is "inside" This might not be true, in which |
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// case it's up to the programmer to specify a correct starting |
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// position later (using FindSeedPixel). Must make sure that the |
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// seed is inside the buffer before touching pixels. |
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this->m_IsAtEnd = true; |
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for ( unsigned int i = 0; i < m_StartIndices.size(); i++ ) |
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{ |
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if ( m_ImageRegion.IsInside ( m_StartIndices[i] ) ) |
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{ |
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m_IndexStack.push(m_StartIndices[i]); |
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this->m_IsAtEnd = false; |
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} |
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} |
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} |
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template<class TImage, class TFunction> |
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void |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::FindSeedPixel() |
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{ |
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// Create an iterator that will walk the input image |
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typedef typename itk::ImageRegionConstIterator<TImage> IRIType; |
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IRIType it = IRIType(this->m_Image, this->m_Image->GetBufferedRegion() ); |
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// Now we search the input image for the first pixel which is inside |
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// the function of interest |
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m_StartIndices.clear(); |
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for ( it.GoToBegin(); !it.IsAtEnd(); ++it) |
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{ |
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if( this->IsPixelIncluded( it.GetIndex() ) ) |
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{ |
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m_StartIndices.push_back ( it.GetIndex() ); |
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// We need to reset the "beginning" now that we have a real seed |
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this->GoToBegin(); |
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return; |
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} |
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} |
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} |
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template<class TImage, class TFunction> |
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void |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::FindSeedPixels() |
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{ |
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// Create an iterator that will walk the input image |
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typedef typename itk::ImageRegionConstIterator<TImage> IRIType; |
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IRIType it = IRIType(this->m_Image, this->m_Image->GetBufferedRegion() ); |
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// Now we search the input image for the first pixel which is inside |
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// the function of interest |
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m_StartIndices.clear(); |
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bool found = false; |
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for ( it.GoToBegin(); !it.IsAtEnd(); ++it) |
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{ |
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if( this->IsPixelIncluded( it.GetIndex() ) ) |
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{ |
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m_StartIndices.push_back ( it.GetIndex() ); |
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found = true; |
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} |
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} |
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if ( found ) |
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{ |
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// We need to reset the "beginning" now that we have a real seed |
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this->GoToBegin(); |
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} |
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} |
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template<class TImage, class TFunction> |
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void |
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FloodFilledFunctionConditionalConstIterator<TImage, TFunction> |
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::DoFloodStep() |
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{ |
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// The index in the front of the queue should always be |
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// valid and be inside since this is what the iterator |
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// uses in the Set/Get methods. This is ensured by the |
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// GoToBegin() method. |
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// Take the index in the front of the queue |
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const IndexType & topIndex = m_IndexStack.front(); |
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// Iterate through all possible dimensions |
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// NOTE: Replace this with a ShapeNeighborhoodIterator |
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for(unsigned int i=0; i<NDimensions; i++) |
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{ |
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// The j loop establishes either left or right neighbor (+-1) |
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for(int j=-1; j<=1; j+=2) |
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{ |
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IndexType tempIndex; |
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// build the index of a neighbor |
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for(unsigned int k=0; k<NDimensions; k++) |
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{ |
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if( i!=k ) |
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{ |
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tempIndex.m_Index[k] = topIndex[k]; |
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} |
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else |
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{ |
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tempIndex.m_Index[k] = topIndex[k] + j; |
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} |
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} // end build the index of a neighbor |
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// If this is a valid index and have not been tested, |
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// then test it. |
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if( m_ImageRegion.IsInside( tempIndex ) ) |
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{ |
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if( tempPtr->GetPixel( tempIndex )==0 ) |
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{ |
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// if it is inside, push it into the queue |
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if( this->IsPixelIncluded( tempIndex ) ) |
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{ |
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m_IndexStack.push( tempIndex ); |
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tempPtr->SetPixel( tempIndex, 2); |
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} |
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else // If the pixel is outside |
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{ |
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// Mark the pixel as outside and remove it from the queue. |
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tempPtr->SetPixel( tempIndex, 1); |
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} |
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} |
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} |
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} // end left/right neighbor loop |
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} // end check all neighbors |
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// Now that all the potential neighbors have been |
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// inserted we can get rid of the pixel in the front |
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m_IndexStack.pop(); |
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if( m_IndexStack.empty() ) |
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{ |
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this->m_IsAtEnd = true; |
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} |
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} |
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} // end namespace itk |
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#endif |
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