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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkLaplacianImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkLaplacianImageFilter_txx
#define __itkLaplacianImageFilter_txx
#include "itkLaplacianImageFilter.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkLaplacianOperator.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
#include "itkProgressAccumulator.h"
namespace itk
{
template< class TInputImage, class TOutputImage >
void
LaplacianImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "UseImageSpacing = " << m_UseImageSpacing << std::endl;
}
template <class TInputImage, class TOutputImage>
void
LaplacianImageFilter<TInputImage,TOutputImage>
::GenerateInputRequestedRegion() throw (InvalidRequestedRegionError)
{
// call the superclass' implementation of this method. this should
// copy the output requested region to the input requested region
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
InputImagePointer inputPtr =
const_cast< TInputImage * > ( this->GetInput() );
if ( !inputPtr )
{
return;
}
// Build an operator so that we can determine the kernel size
LaplacianOperator<OutputPixelType, ImageDimension> oper;
oper.CreateOperator();
// get a copy of the input requested region (should equal the output
// requested region)
typename TInputImage::RegionType inputRequestedRegion;
inputRequestedRegion = inputPtr->GetRequestedRegion();
// pad the input requested region by the operator radius
inputRequestedRegion.PadByRadius( oper.GetRadius() );
// crop the input requested region at the input's largest possible region
if ( inputRequestedRegion.Crop(inputPtr->GetLargestPossibleRegion()) )
{
inputPtr->SetRequestedRegion( inputRequestedRegion );
return;
}
else
{
// Couldn't crop the region (requested region is outside the largest
// possible region). Throw an exception.
// store what we tried to request (prior to trying to crop)
inputPtr->SetRequestedRegion( inputRequestedRegion );
// build an exception
InvalidRequestedRegionError e(__FILE__, __LINE__);
e.SetLocation(ITK_LOCATION);
e.SetDescription("Requested region is (at least partially) outside the largest possible region.");
e.SetDataObject(inputPtr);
throw e;
}
}
template< class TInputImage, class TOutputImage >
void
LaplacianImageFilter< TInputImage, TOutputImage >
::GenerateData()
{
double s[ImageDimension];
typename TOutputImage::Pointer output = this->GetOutput();
output->SetBufferedRegion(output->GetRequestedRegion());
output->Allocate();
ZeroFluxNeumannBoundaryCondition<TOutputImage> nbc;
// Create the Laplacian operator
LaplacianOperator<OutputPixelType, ImageDimension> oper;
for (unsigned i = 0; i < ImageDimension; i++)
{
if (this->GetInput()->GetSpacing()[i] == 0.0 )
{
itkExceptionMacro( << "Image spacing cannot be zero" );
}
else
{
s[i] = 1.0 / this->GetInput()->GetSpacing()[i];
}
}
oper.SetDerivativeScalings( s );
oper.CreateOperator();
typedef NeighborhoodOperatorImageFilter<InputImageType, OutputImageType> NOIF;
typename NOIF::Pointer filter = NOIF::New();
filter->OverrideBoundaryCondition(&nbc);
// Create a process accumulator for tracking the progress of this minipipeline
ProgressAccumulator::Pointer progress = ProgressAccumulator::New();
progress->SetMiniPipelineFilter(this);
// Register the filter with the with progress accumulator using
// equal weight proportion
progress->RegisterInternalFilter(filter,1.0f);
//
// set up the mini-pipline
//
filter->SetOperator(oper);
filter->SetInput(this->GetInput());
// graft this filter's output to the mini-pipeline. this sets up
// the mini-pipeline to write to this filter's output and copies
// region ivars and meta-data
filter->GraftOutput(output);
// execute the mini-pipeline
filter->Update();
// graft the output of the mini-pipeline back onto the filter's output.
// this copies back the region ivars and meta-dataig
this->GraftOutput(filter->GetOutput());
}
} // end namespace itk
#endif
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