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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 itkCurvatureFlowImageFilter_hxx
#define itkCurvatureFlowImageFilter_hxx
#include "itkCurvatureFlowImageFilter.h"
#include "itkMacro.h"
namespace itk
{
/**
* Constructor
*/
template< typename TInputImage, typename 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< typename TInputImage, typename TOutputImage >
void
CurvatureFlowImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Time step: " << m_TimeStep;
os << std::endl;
}
/**
* Initialize the state of filter and equation before each iteration.
*/
template< typename TInputImage, typename 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< typename TInputImage, typename 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< typename TInputImage, typename 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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