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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 itkCorrelationImageToImageMetricv4HelperThreader_h
#define itkCorrelationImageToImageMetricv4HelperThreader_h
#include "itkImageToImageMetricv4GetValueAndDerivativeThreader.h"
namespace itk
{
/** \class CorrelationImageToImageMetricv4GetValueAndDerivativeThreader
* \brief Helper class for CorrelationImageToImageMetricv4 \c
* To compute the average pixel intensities of the fixed image and the moving image
* on the sampled points or inside the virtual image region:
* \f$ \bar f (CorrelationImageToImageMetricv4::m_AverageFix ) \f$
* \f$ \bar m (CorrelationImageToImageMetricv4::m_AverageMov ) \f$
*
* \ingroup ITKMetricsv4
*/
template < typename TDomainPartitioner, typename TImageToImageMetric, typename TCorrelationMetric >
class ITK_TEMPLATE_EXPORT CorrelationImageToImageMetricv4HelperThreader
: public ImageToImageMetricv4GetValueAndDerivativeThreader< TDomainPartitioner, TImageToImageMetric >
{
public:
/** Standard class typedefs. */
typedef CorrelationImageToImageMetricv4HelperThreader Self;
typedef ImageToImageMetricv4GetValueAndDerivativeThreader< TDomainPartitioner, TImageToImageMetric > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
itkTypeMacro( CorrelationImageToImageMetricv4HelperThreader, ImageToImageMetricv4GetValueAndDerivativeThreader );
itkNewMacro( Self );
typedef typename Superclass::DomainType DomainType;
typedef typename Superclass::AssociateType AssociateType;
typedef typename Superclass::ImageToImageMetricv4Type ImageToImageMetricv4Type;
typedef typename Superclass::VirtualIndexType VirtualIndexType;
typedef typename Superclass::VirtualPointType VirtualPointType;
typedef typename Superclass::FixedImagePointType FixedImagePointType;
typedef typename Superclass::FixedImagePixelType FixedImagePixelType;
typedef typename Superclass::FixedImageGradientType FixedImageGradientType;
typedef typename Superclass::MovingImagePointType MovingImagePointType;
typedef typename Superclass::MovingImagePixelType MovingImagePixelType;
typedef typename Superclass::MovingImageGradientType MovingImageGradientType;
typedef typename Superclass::MeasureType MeasureType;
typedef typename Superclass::DerivativeType DerivativeType;
typedef typename Superclass::DerivativeValueType DerivativeValueType;
typedef typename Superclass::InternalComputationValueType InternalComputationValueType;
typedef typename Superclass::NumberOfParametersType NumberOfParametersType;
typedef typename Superclass::FixedOutputPointType FixedOutputPointType;
typedef typename Superclass::MovingOutputPointType MovingOutputPointType;
protected:
CorrelationImageToImageMetricv4HelperThreader();
virtual ~CorrelationImageToImageMetricv4HelperThreader() ITK_OVERRIDE;
/** Overload: Resize and initialize per thread objects. */
virtual void BeforeThreadedExecution() ITK_OVERRIDE;
/** Overload:
* Collects the results from each thread and sums them. Results are stored
* in the enclosing class \c m_Value and \c m_DerivativeResult. Behavior
* depends on m_AverageValueAndDerivativeByNumberOfValuePoints,
* m_NumberOfValidPoints, to average the value sum, and to average
* derivative sums for global transforms only (i.e. transforms without local
* support). */
virtual void AfterThreadedExecution() ITK_OVERRIDE;
/* Overload: don't need to compute the image gradients and store derivatives
*
* Method called by the threaders to process the given virtual point. This
* in turn calls \c TransformAndEvaluateFixedPoint, \c
* TransformAndEvaluateMovingPoint, and \c ProcessPoint.
*/
virtual bool ProcessVirtualPoint( const VirtualIndexType & virtualIndex,
const VirtualPointType & virtualPoint,
const ThreadIdType threadId ) ITK_OVERRIDE;
/**
* Not using. All processing is done in ProcessVirtualPoint.
*/
virtual bool ProcessPoint(
const VirtualIndexType & ,
const VirtualPointType & ,
const FixedImagePointType & ,
const FixedImagePixelType & ,
const FixedImageGradientType & ,
const MovingImagePointType & ,
const MovingImagePixelType & ,
const MovingImageGradientType & ,
MeasureType & ,
DerivativeType & ,
const ThreadIdType ) const ITK_OVERRIDE
{
return false;
}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(CorrelationImageToImageMetricv4HelperThreader);
struct CorrelationMetricPerThreadStruct
{
InternalComputationValueType FixSum;
InternalComputationValueType MovSum;
};
itkPadStruct( ITK_CACHE_LINE_ALIGNMENT, CorrelationMetricPerThreadStruct,
PaddedCorrelationMetricPerThreadStruct);
itkAlignedTypedef( ITK_CACHE_LINE_ALIGNMENT, PaddedCorrelationMetricPerThreadStruct,
AlignedCorrelationMetricPerThreadStruct );
/* per thread variables for correlation and its derivatives */
mutable AlignedCorrelationMetricPerThreadStruct * m_CorrelationMetricPerThreadVariables;
/** Internal pointer to the metric object in use by this threader.
* This will avoid costly dynamic casting in tight loops. */
TCorrelationMetric * m_CorrelationAssociate;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkCorrelationImageToImageMetricv4HelperThreader.hxx"
#endif
#endif
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