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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkWatershedBoundaryResolver.txx,v $
Language: C++
Date: $Date: 2003-09-10 14:28:41 $
Version: $Revision: 1.8 $
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 __itkWatershedBoundaryResolver_txx
#define __itkWatershedBoundaryResolver_txx
#include "itkWatershedBoundaryResolver.h"
#include "itkImageRegionIterator.h"
namespace itk
{
namespace watershed
{
template <class TPixelType, unsigned int TDimension>
void BoundaryResolver<TPixelType, TDimension>
::GenerateData()
{
//
// NOTE: This method does not yet support arbitrary connectivity
// across the boundary. It does support arbitrary dimensions.
// See itkWatershedSegmenter for details. City-block style connectivity
// is assumed (ie 4-, 6- for 2d, 3d). jc 11/14/01
//
typedef typename BoundaryType::face_t FaceType;
typename BoundaryType::IndexType idxA;
typename BoundaryType::IndexType idxB;
EquivalencyTableType::Pointer equivTable = this->GetEquivalencyTable();
typename BoundaryType::Pointer boundaryA = this->GetBoundaryA();
typename BoundaryType::Pointer boundaryB = this->GetBoundaryB();
idxA.first = this->GetFace();
idxB.first = this->GetFace();
idxA.second = 1; // HIGH face matches
idxB.second = 0; // the LOW face.
// Initialize current minLabel
// Initialize the current boundsMin
// For each flat region frA in boundaryA:
// For each offset offA in frA:
// Lookup the flat region in boundaryB into which it flows: frB
// If frB.bounds_min < boundsMin then boundsMin =frB.bounds_min
// and minLabel = frB.minLabel
// Create equivalencies for all offA.labels, the frA label, and
// the minLabel
//
// For each boundary pixel in boundaryA then in boundary B:
// 1) Does A flow to B? or B flow to A?
// 2) If (1) then create equivalency to the label
// into which this pixel flows.
//
// This constructs equivalencies between both flat regions and
// non-flat regions.
//
ImageRegionIterator<FaceType> itA(boundaryA->GetFace(idxA),
boundaryA->GetFace(idxA)->GetRequestedRegion());
ImageRegionIterator<FaceType> itB(boundaryB->GetFace(idxB),
boundaryB->GetFace(idxB)->GetRequestedRegion());
for (itA = itA.Begin(), itB = itB.Begin(); !itA.IsAtEnd(); ++itA, ++itB )
{
if ( itA.Get().flow != SegmenterType::NULL_FLOW )
{
equivTable->Add(itA.Get().label, itB.Get().label);
}
if ( itB.Get().flow != SegmenterType::NULL_FLOW )
{
equivTable->Add(itA.Get().label, itB.Get().label);
}
}
equivTable->Flatten();
}
// ------------------------------------------------------------
// --------------------PIPELINE METHODS------------------------
// ------------------------------------------------------------
template <class TPixelType, unsigned int TDimension>
void BoundaryResolver<TPixelType, TDimension>
::GenerateOutputRequestedRegion(DataObject *)
{
}
template<class TPixelType, unsigned int TDimension>
typename BoundaryResolver<TPixelType, TDimension>::DataObjectPointer
BoundaryResolver<TPixelType, TDimension>
::MakeOutput(unsigned int )
{
return static_cast<DataObject*>(EquivalencyTable::New().GetPointer());
}
template<class TPixelType, unsigned int TDimension>
void
BoundaryResolver<TPixelType, TDimension>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Face = " << m_Face << std::endl;
}
} // end namespace watershed
} // end namespace itk
#endif
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