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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 itkLabelVotingImageFilter_hxx
#define itkLabelVotingImageFilter_hxx
#include "itkLabelVotingImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "itkMath.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
LabelVotingImageFilter< TInputImage, TOutputImage >
::LabelVotingImageFilter() :
m_LabelForUndecidedPixels( 0 ),
m_HasLabelForUndecidedPixels( false ),
m_TotalLabelCount( 0 )
{
}
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 indexed inputs
const size_t numberOfInputIndexes = this->GetNumberOfIndexedInputs();
for ( size_t i = 0; i < numberOfInputIndexes; ++i )
{
const InputImageType *inputImage = this->GetInput(i);
IteratorType it( inputImage, inputImage->GetBufferedRegion() );
for ( it.GoToBegin(); !it.IsAtEnd(); ++it )
{
maxLabel = std::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 =
static_cast<size_t>(this->ComputeMaximumInputValue()) + 1;
if ( !this->m_HasLabelForUndecidedPixels )
{
if (this->m_TotalLabelCount > itk::NumericTraits<OutputPixelType>::max())
{
itkWarningMacro("No new label for undecided pixels, using zero.");
}
this->m_LabelForUndecidedPixels = static_cast<OutputPixelType>( 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,
ThreadIdType threadId )
{
ProgressReporter progress( this, threadId, outputRegionForThread.GetNumberOfPixels() );
typedef ImageRegionConstIterator< TInputImage > IteratorType;
typedef ImageRegionIterator< TOutputImage > OutIteratorType;
typename TOutputImage::Pointer output = this->GetOutput();
// Record the number of indexed inputs
const size_t numberOfInputIndexes = this->GetNumberOfIndexedInputs();
// Create and initialize all input image iterators
IteratorType *it = new IteratorType[numberOfInputIndexes];
for ( size_t i = 0; i < numberOfInputIndexes; ++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
std::fill_n( votesByLabel, this->m_TotalLabelCount, 0 );
// count number of votes for the labels
for ( unsigned int i = 0; i < numberOfInputIndexes; ++i )
{
const InputPixelType label = it[i].Get();
if ( NumericTraits<InputPixelType>::IsNonnegative( label ) )
{
++votesByLabel[label];
}
++( it[i] );
}
// Determine the label with the most votes for this pixel
out.Set(0);
unsigned int maxVotes = votesByLabel[0];
for ( size_t l = 1; l < this->m_TotalLabelCount; ++l )
{
if ( votesByLabel[l] > maxVotes )
{
maxVotes = votesByLabel[l];
out.Set(static_cast<OutputPixelType>(l));
}
else
{
if ( votesByLabel[l] == maxVotes )
{
out.Set(this->m_LabelForUndecidedPixels);
}
}
}
progress.CompletedPixel();
}
delete[] it;
delete[] votesByLabel;
}
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;
}
} // end namespace itk
#endif
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