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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 itkWatershedBoundaryResolver_hxx
#define itkWatershedBoundaryResolver_hxx
#include "itkWatershedBoundaryResolver.h"
#include "itkImageRegionIterator.h"
namespace itk
{
namespace watershed
{
template< typename 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.GoToBegin(), itB.GoToBegin(); !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< typename TPixelType, unsigned int TDimension >
void BoundaryResolver< TPixelType, TDimension >
::GenerateOutputRequestedRegion(DataObject *)
{}
template< typename TPixelType, unsigned int TDimension >
typename BoundaryResolver< TPixelType, TDimension >::DataObjectPointer
BoundaryResolver< TPixelType, TDimension >
::MakeOutput(DataObjectPointerArraySizeType)
{
return EquivalencyTable::New().GetPointer();
}
template< typename 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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