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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkLabelVotingImageFilter.txx,v $
Language: C++
Date: $Date: 2005-07-17 12:26:43 $
Version: $Revision: 1.4 $
Copyright (c) 2002 Insight 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 _itkLabelVotingImageFilter_txx
#define _itkLabelVotingImageFilter_txx
#include "itkLabelVotingImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "vnl/vnl_math.h"
namespace itk
{
template <typename TInputImage, typename TOutputImage>
void
LabelVotingImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "m_HasLabelForUndecidedPixels = "
<< this->m_HasLabelForUndecidedPixels << std::endl;
os << indent << "m_LabelForUndecidedPixels = "
<< this->m_LabelForUndecidedPixels << std::endl;
}
template< typename TInputImage, typename TOutputImage >
typename LabelVotingImageFilter< TInputImage,TOutputImage>::InputPixelType
LabelVotingImageFilter< TInputImage, TOutputImage >
::ComputeMaximumInputValue()
{
InputPixelType maxLabel = 0;
typedef ImageRegionConstIterator< TInputImage > IteratorType;
// Record the number of input files.
const unsigned int numberOfInputFiles = this->GetNumberOfInputs();
for(unsigned int i = 0; i < numberOfInputFiles; ++i)
{
const InputImageType * inputImage = this->GetInput( i );
IteratorType it( inputImage, inputImage->GetBufferedRegion() );
for( it.GoToBegin(); !it.IsAtEnd(); ++it )
{
maxLabel = vnl_math_max( maxLabel, it.Get() );
}
}
return maxLabel;
}
template< typename TInputImage, typename TOutputImage >
void
LabelVotingImageFilter< TInputImage, TOutputImage >
::BeforeThreadedGenerateData ()
{
Superclass::BeforeThreadedGenerateData();
// determine the maximum label in all input images
this->m_TotalLabelCount = this->ComputeMaximumInputValue() + 1;
if ( ! this->m_HasLabelForUndecidedPixels )
{
this->m_LabelForUndecidedPixels = this->m_TotalLabelCount;
}
// Allocate the output image.
typename TOutputImage::Pointer output = this->GetOutput();
output->SetBufferedRegion( output->GetRequestedRegion() );
output->Allocate();
}
template< typename TInputImage, typename TOutputImage >
void
LabelVotingImageFilter< TInputImage, TOutputImage >
::ThreadedGenerateData( const OutputImageRegionType &outputRegionForThread,
int itkNotUsed(threadId))
{
typedef ImageRegionConstIterator< TInputImage > IteratorType;
typedef ImageRegionIterator< TOutputImage> OutIteratorType;
typename TOutputImage::Pointer output = this->GetOutput();
// Record the number of input files.
const unsigned int numberOfInputFiles = this->GetNumberOfInputs();
// create and initialize all input image iterators
IteratorType *it = new IteratorType[numberOfInputFiles];
for ( unsigned int i = 0; i < numberOfInputFiles; ++i)
{
it[i] = IteratorType( this->GetInput( i ),
outputRegionForThread );
}
unsigned int* votesByLabel = new unsigned int[ this->m_TotalLabelCount ];
OutIteratorType out = OutIteratorType( output, outputRegionForThread );
for( out.GoToBegin(); !out.IsAtEnd(); ++out )
{
// reset number of votes per label for all labels
for( InputPixelType l = 0; l < this->m_TotalLabelCount; ++l )
{
votesByLabel[l] = 0;
}
// count number of votes for the labels
for( unsigned int i = 0; i < numberOfInputFiles; ++i)
{
const InputPixelType label = it[i].Get();
++votesByLabel[label];
++(it[i]);
}
// determine the label with the most votes for this pixel
out.Set( 0 );
unsigned int maxVotes = votesByLabel[0];
for( InputPixelType l = 1; l < this->m_TotalLabelCount; ++l )
{
if( votesByLabel[l] > maxVotes )
{
maxVotes = votesByLabel[l];
out.Set( l );
}
else
{
if( votesByLabel[l] == maxVotes )
{
out.Set( this->m_LabelForUndecidedPixels );
}
}
}
}
delete[] it;
delete[] votesByLabel;
}
} // end namespace itk
#endif
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