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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 itkLaplacianImageFilter_hxx
#define itkLaplacianImageFilter_hxx
#include "itkLaplacianImageFilter.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkLaplacianOperator.h"
#include "itkProgressAccumulator.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
void
LaplacianImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "UseImageSpacing = " << m_UseImageSpacing << std::endl;
}
template< typename TInputImage, typename TOutputImage >
void
LaplacianImageFilter< TInputImage, TOutputImage >
::GenerateInputRequestedRegion()
{
// 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< typename TInputImage, typename TOutputImage >
void
LaplacianImageFilter< TInputImage, TOutputImage >
::GenerateData()
{
double s[ImageDimension];
typename TOutputImage::Pointer output = this->GetOutput();
output->SetBufferedRegion( output->GetRequestedRegion() );
output->Allocate();
ZeroFluxNeumannBoundaryCondition< TInputImage > 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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