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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 itkDerivativeImageFilter_hxx
#define itkDerivativeImageFilter_hxx
#include "itkDerivativeImageFilter.h"
#include "itkNumericTraits.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkDerivativeOperator.h"
#include "itkProgressAccumulator.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
void
DerivativeImageFilter< 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
typename Superclass::InputImagePointer inputPtr =
const_cast< InputImageType * >( this->GetInput() );
if ( !inputPtr )
{
return;
}
// Build an operator so that we can determine the kernel size
DerivativeOperator< OutputPixelType, ImageDimension > oper;
oper.SetDirection(m_Direction);
oper.SetOrder(m_Order);
oper.CreateDirectional();
// 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
DerivativeImageFilter< TInputImage, TOutputImage >
::GenerateData()
{
ZeroFluxNeumannBoundaryCondition< TInputImage > nbc;
// Define the operator value type so that we can filter integral
// images and have the proper operator defined.
typedef typename NumericTraits< OutputPixelType >::RealType OperatorValueType;
// Filter
DerivativeOperator< OperatorValueType, ImageDimension > oper;
oper.SetDirection(m_Direction);
oper.SetOrder(m_Order);
oper.CreateDirectional();
oper.FlipAxes();
if ( m_UseImageSpacing == true )
{
if ( this->GetInput()->GetSpacing()[m_Direction] == 0.0 )
{
itkExceptionMacro(<< "Image spacing cannot be zero.");
}
else
{
oper.ScaleCoefficients(1.0 / this->GetInput()->GetSpacing()[m_Direction]);
}
}
typename NeighborhoodOperatorImageFilter< InputImageType, OutputImageType, OperatorValueType >
::Pointer filter =
NeighborhoodOperatorImageFilter< InputImageType, OutputImageType, OperatorValueType >
::New();
// 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);
filter->OverrideBoundaryCondition(&nbc);
//
// 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( this->GetOutput() );
// 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-data.
this->GraftOutput( filter->GetOutput() );
}
template< typename TInputImage, typename TOutputImage >
void
DerivativeImageFilter< TInputImage, TOutputImage >::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Order: " << m_Order << std::endl;
os << indent << "Direction: " << m_Direction << std::endl;
os << indent << "UseImageSpacing: " << m_UseImageSpacing << std::endl;
}
} // end namespace itk
#endif
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