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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkCurvatureFlowImageFilter.txx,v $
Language: C++
Date: $Date: 2003-10-07 16:42:27 $
Version: $Revision: 1.32 $
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 __itkCurvatureFlowImageFilter_txx_
#define __itkCurvatureFlowImageFilter_txx_
#include "itkCurvatureFlowImageFilter.h"
#include "itkExceptionObject.h"
namespace itk
{
/*
* Constructor
*/
template <class TInputImage, class TOutputImage>
CurvatureFlowImageFilter<TInputImage, TOutputImage>
::CurvatureFlowImageFilter()
{
this->SetNumberOfIterations(0);
m_TimeStep = 0.05f;
typename CurvatureFlowFunctionType::Pointer cffp;
cffp = CurvatureFlowFunctionType::New();
this->SetDifferenceFunction( static_cast<FiniteDifferenceFunctionType *>(
cffp.GetPointer() ) );
}
/*
* Standard PrintSelf method.
*/
template <class TInputImage, class TOutputImage>
void
CurvatureFlowImageFilter<TInputImage, TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << std::endl;
os << indent << "Time step: " << m_TimeStep;
os << std::endl;
}
/*
* Initialize the state of filter and equation before each iteration.
*/
template <class TInputImage, class TOutputImage>
void
CurvatureFlowImageFilter<TInputImage, TOutputImage>
::InitializeIteration()
{
// update variables in the equation object
CurvatureFlowFunctionType *f =
dynamic_cast<CurvatureFlowFunctionType *>
(this->GetDifferenceFunction().GetPointer());
if ( !f )
{
itkExceptionMacro(<<"DifferenceFunction not of type CurvatureFlowFunction");
}
f->SetTimeStep( m_TimeStep );
// call superclass's version
this->Superclass::InitializeIteration();
// progress feedback
if ( this->GetNumberOfIterations() != 0 )
{
this->UpdateProgress(((float)(this->GetElapsedIterations()))
/((float)(this->GetNumberOfIterations())));
}
}
/*
* GenerateInputRequestedRegion
*/
template <class TInputImage, class TOutputImage>
void
CurvatureFlowImageFilter<TInputImage, TOutputImage>
::GenerateInputRequestedRegion()
{
// call the superclass's implementation
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
typename Superclass::InputImagePointer inputPtr =
const_cast< InputImageType * >( this->GetInput() );
OutputImagePointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
// set the input requested region to be the same as
// the output requested region
inputPtr->SetRequestedRegion(
outputPtr->GetRequestedRegion() );
}
/*
* EnlargeOutputRequestedRegion
*/
template <class TInputImage, class TOutputImage>
void
CurvatureFlowImageFilter<TInputImage, TOutputImage>
::EnlargeOutputRequestedRegion(
DataObject * ptr )
{
// convert DataObject pointer to OutputImageType pointer
OutputImageType * outputPtr;
outputPtr = dynamic_cast<OutputImageType*>( ptr );
// get input image pointer
typename Superclass::InputImagePointer inputPtr =
const_cast< InputImageType * >( this->GetInput() );
if ( !inputPtr || !outputPtr )
{
return;
}
// Get the size of the neighborhood on which we are going to operate. This
// radius is supplied by the difference function we are using.
typename FiniteDifferenceFunctionType::RadiusType radius
= this->GetDifferenceFunction()->GetRadius();
for( unsigned int j = 0; j < ImageDimension; j++ )
{
radius[j] *= this->GetNumberOfIterations();
}
/*
* NewOutputRequestedRegion = OldOutputRequestedRegion +
* radius * m_NumberOfIterations padding on each edge
*/
typename OutputImageType::RegionType outputRequestedRegion =
outputPtr->GetRequestedRegion();
outputRequestedRegion.PadByRadius( radius );
outputRequestedRegion.Crop( outputPtr->GetLargestPossibleRegion() );
outputPtr->SetRequestedRegion( outputRequestedRegion );
}
} // end namespace itk
#endif
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