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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 itkComposeDisplacementFieldsImageFilter_hxx
#define itkComposeDisplacementFieldsImageFilter_hxx
#include "itkComposeDisplacementFieldsImageFilter.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkImageRegionIterator.h"
#include "itkVectorLinearInterpolateImageFunction.h"
namespace itk
{
/*
* ComposeDisplacementFieldsImageFilter class definitions
*/
template<typename InputImage, typename TOutputImage>
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::ComposeDisplacementFieldsImageFilter()
{
this->SetNumberOfRequiredInputs( 2 );
typedef VectorLinearInterpolateImageFunction<InputFieldType, RealType> DefaultInterpolatorType;
typename DefaultInterpolatorType::Pointer interpolator = DefaultInterpolatorType::New();
this->m_Interpolator = interpolator;
}
template<typename InputImage, typename TOutputImage>
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::~ComposeDisplacementFieldsImageFilter()
{
}
template<typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::SetInterpolator( InterpolatorType *interpolator )
{
itkDebugMacro( "setting Interpolator to " << interpolator );
if ( this->m_Interpolator != interpolator )
{
this->m_Interpolator = interpolator;
this->Modified();
if( this->GetDisplacementField() )
{
this->m_Interpolator->SetInputImage( this->GetInput( 0 ) );
}
}
}
template<typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::BeforeThreadedGenerateData()
{
VectorType zeroVector( 0.0 );
this->GetOutput()->FillBuffer( zeroVector );
if( !this->m_Interpolator->GetInputImage() )
{
itkExceptionMacro( "Displacement field not set in interpolator." );
}
}
template<typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::ThreadedGenerateData( const RegionType & region, ThreadIdType itkNotUsed( threadId ) )
{
typename OutputFieldType::Pointer output = this->GetOutput();
typename InputFieldType::ConstPointer warpingField = this->GetWarpingField();
ImageRegionConstIteratorWithIndex<InputFieldType> ItW( warpingField, region );
ImageRegionIterator<OutputFieldType> ItF( output, region );
PointType pointIn1;
PointType pointIn2;
PointType pointIn3;
typename OutputFieldType::PixelType outDisplacement;
for( ItW.GoToBegin(), ItF.GoToBegin(); !ItW.IsAtEnd(); ++ItW, ++ItF )
{
warpingField->TransformIndexToPhysicalPoint( ItW.GetIndex(), pointIn1 );
VectorType warpVector = ItW.Get();
for( unsigned int d = 0; d < ImageDimension; d++ )
{
pointIn2[d] = pointIn1[d] + warpVector[d];
}
typename InterpolatorType::OutputType displacement( 0.0 );
if( this->m_Interpolator->IsInsideBuffer( pointIn2 ) )
{
displacement = this->m_Interpolator->Evaluate( pointIn2 );
}
for( unsigned int d = 0; d < ImageDimension; d++ )
{
pointIn3[d] = pointIn2[d] + displacement[d];
}
outDisplacement = pointIn3 - pointIn1;
ItF.Set( outDisplacement );
}
}
template<typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf( os, indent );
itkPrintSelfObjectMacro( Interpolator );
}
} //end namespace itk
#endif
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