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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBinaryPruningImageFilter.txx,v $
Language: C++
Date: $Date: 2004-10-18 21:29:12 $
Version: $Revision: 1.4 $
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 _itkBinaryPruningImageFilter_txx
#define _itkBinaryPruningImageFilter_txx
#include <iostream>
#include "itkBinaryPruningImageFilter.h"
#include "itkImageRegionConstIterator.h"
#include "itkImageRegionIterator.h"
#include "itkNeighborhoodIterator.h"
namespace itk
{
/**
* Constructor
*/
template <class TInputImage,class TOutputImage>
BinaryPruningImageFilter<TInputImage,TOutputImage>
::BinaryPruningImageFilter()
{
this->SetNumberOfRequiredOutputs( 1 );
OutputImagePointer pruneImage = OutputImageType::New();
this->SetNthOutput( 0, pruneImage.GetPointer() );
m_Iteration = 3;
}
/**
* Return the pruning Image pointer
*/
template <class TInputImage,class TOutputImage>
typename BinaryPruningImageFilter<
TInputImage,TOutputImage>::OutputImageType *
BinaryPruningImageFilter<TInputImage,TOutputImage>
::GetPruning(void)
{
return dynamic_cast< OutputImageType * >(
this->ProcessObject::GetOutput(0) );
}
/**
* Prepare data for computation
*/
template <class TInputImage,class TOutputImage>
void
BinaryPruningImageFilter<TInputImage,TOutputImage>
::PrepareData(void)
{
itkDebugMacro(<< "PrepareData Start");
OutputImagePointer pruneImage = GetPruning();
InputImagePointer inputImage =
dynamic_cast<const TInputImage *>( ProcessObject::GetInput(0) );
pruneImage->SetBufferedRegion( pruneImage->GetRequestedRegion() );
pruneImage->Allocate();
typename OutputImageType::RegionType region = pruneImage->GetRequestedRegion();
ImageRegionConstIterator< TInputImage > it( inputImage, region );
ImageRegionIterator< TOutputImage > ot( pruneImage, region );
it.GoToBegin();
ot.GoToBegin();
itkDebugMacro(<< "PrepareData: Copy input to output");
while( !ot.IsAtEnd() )
{
ot.Set( static_cast< typename OutputImageType::PixelType >( it.Get() ) );
++it;
++ot;
}
itkDebugMacro(<< "PrepareData End");
}
/**
* Post processing for computing thinning
*/
template <class TInputImage,class TOutputImage>
void
BinaryPruningImageFilter<TInputImage,TOutputImage>
::ComputePruneImage()
{
itkDebugMacro( << "ComputeThinImage Start");
OutputImagePointer pruneImage = GetPruning();
typename OutputImageType::RegionType region = pruneImage->GetRequestedRegion();
typename NeighborhoodIteratorType::RadiusType radius;
radius.Fill(1);
NeighborhoodIteratorType ot( radius, pruneImage, region );
typename NeighborhoodIteratorType::OffsetType offset1 = {{-1,-1}};
typename NeighborhoodIteratorType::OffsetType offset2 = {{-1,0}};
typename NeighborhoodIteratorType::OffsetType offset3 = {{-1,1 }};
typename NeighborhoodIteratorType::OffsetType offset4 = {{0,1}};
typename NeighborhoodIteratorType::OffsetType offset5 = {{1,1}};
typename NeighborhoodIteratorType::OffsetType offset6 = {{1,0}};
typename NeighborhoodIteratorType::OffsetType offset7 = {{1,-1}};
typename NeighborhoodIteratorType::OffsetType offset8 = {{0,-1}};
unsigned int count = 0;
while(count < m_Iteration)
{
ot.GoToBegin();
while( ! ot.IsAtEnd() )
{
if (ot.GetCenterPixel())
{
PixelType genus;
genus = ot.GetPixel(offset1) + ot.GetPixel(offset2);
genus += ot.GetPixel(offset3) + ot.GetPixel(offset4);
genus += ot.GetPixel(offset5) + ot.GetPixel(offset6);
genus += ot.GetPixel(offset7) + ot.GetPixel(offset8);
if (genus < 2)
{
genus = 0;
ot.SetCenterPixel( genus );
}
}
++ot;
}
++count;
}
itkDebugMacro( << "ComputeThinImage End");
}
/**
* Generate PruneImage
*/
template <class TInputImage,class TOutputImage>
void
BinaryPruningImageFilter<TInputImage,TOutputImage>
::GenerateData()
{
this->PrepareData();
itkDebugMacro(<< "GenerateData: Computing Thinning Image");
this->ComputePruneImage();
} // end GenerateData()
/**
* Print Self
*/
template <class TInputImage,class TOutputImage>
void
BinaryPruningImageFilter<TInputImage,TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Pruning image: " << std::endl;
os << indent << "Iteration: " << m_Iteration << std::endl;
}
} // end namespace itk
#endif
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