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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkGeodesicActiveContourShapePriorLevelSetFunction.txx,v $
Language: C++
Date: $Date: 2003-09-10 14:28:31 $
Version: $Revision: 1.2 $
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 __itkGeodesicActiveContourShapePriorLevelSetFunction_txx_
#define __itkGeodesicActiveContourShapePriorLevelSetFunction_txx_
#include "itkGeodesicActiveContourShapePriorLevelSetFunction.h"
#include "itkGradientRecursiveGaussianImageFilter.h"
namespace itk {
/**
* Calculate the speed image.
*/
template <class TImageType, class TFeatureImageType>
void
GeodesicActiveContourShapePriorLevelSetFunction<TImageType, TFeatureImageType>
::CalculateSpeedImage()
{
/* copy the feature image into the speed image */
ImageRegionConstIterator<FeatureImageType>
fit(this->GetFeatureImage(), this->GetFeatureImage()->GetRequestedRegion());
ImageRegionIterator<ImageType>
sit(this->GetSpeedImage(), this->GetFeatureImage()->GetRequestedRegion());
for ( fit.GoToBegin(), sit.GoToBegin(); ! fit.IsAtEnd(); ++sit, ++fit)
{
sit.Set( static_cast<ScalarValueType>( fit.Get() ) );
}
}
/**
* Calculate the advection speed image
*/
template <class TImageType, class TFeatureImageType>
void GeodesicActiveContourShapePriorLevelSetFunction<TImageType, TFeatureImageType>
::CalculateAdvectionImage()
{
/* compoute the gradient of the feature image. */
typedef GradientRecursiveGaussianImageFilter<FeatureImageType,VectorImageType>
DerivativeFilterType;
typename DerivativeFilterType::Pointer derivative = DerivativeFilterType::New();
derivative->SetInput( this->GetFeatureImage() );
derivative->SetSigma( m_DerivativeSigma );
derivative->Update();
/* copy negative gradient into the advection image. */
ImageRegionIterator<VectorImageType>
dit( derivative->GetOutput(), this->GetFeatureImage()->GetRequestedRegion() );
ImageRegionIterator<VectorImageType>
ait( this->GetAdvectionImage(), this->GetFeatureImage()->GetRequestedRegion() );
for( dit.GoToBegin(), ait.GoToBegin(); !dit.IsAtEnd(); ++dit, ++ait )
{
typename VectorImageType::PixelType v = dit.Get();
for ( unsigned int j = 0; j < ImageDimension; j++ )
{
v[j] *= -1.0L;
}
ait.Set( v);
}
}
} // end namespace itk
#endif
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