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itkExpectationBasedPointSetToPointSetMetricv4.hxx
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itkExpectationBasedPointSetToPointSetMetricv4.hxx
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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 itkExpectationBasedPointSetToPointSetMetricv4_hxx
#define itkExpectationBasedPointSetToPointSetMetricv4_hxx
#include "itkExpectationBasedPointSetToPointSetMetricv4.h"
#include "itkArray.h"
namespace itk {
/** Constructor */
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::ExpectationBasedPointSetToPointSetMetricv4() :
m_PointSetSigma( 1.0 ),
m_PreFactor( 0.0 ),
m_Denominator( 0.0 ),
m_EvaluationKNeighborhood( 50 )
{
}
/** Destructor */
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::~ExpectationBasedPointSetToPointSetMetricv4()
{
}
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
void
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::Initialize( void ) throw ( ExceptionObject )
{
Superclass::Initialize();
if( this->m_PointSetSigma <= NumericTraits<CoordRepType>::epsilon() )
{
itkExceptionMacro("m_PointSetSigma is too small. <= epsilon");
}
this->m_PreFactor = 1.0 / ( std::sqrt( 2 * itk::Math::pi ) * this->m_PointSetSigma );
this->m_Denominator = 2.0 * itk::Math::sqr( this->m_PointSetSigma );
}
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
typename ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::MeasureType
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::GetLocalNeighborhoodValue( const PointType & point, const PixelType & itkNotUsed( pixel ) ) const
{
MeasureType localValue = NumericTraits<MeasureType>::ZeroValue();
NeighborsIdentifierType neighborhood;
this->m_MovingTransformedPointsLocator->FindClosestNPoints( point, this->m_EvaluationKNeighborhood, neighborhood );
for( NeighborsIterator it = neighborhood.begin(); it != neighborhood.end(); ++it )
{
PointType neighbor = this->m_MovingTransformedPointSet->GetPoint( *it );
const MeasureType distance = point.SquaredEuclideanDistanceTo( neighbor );
localValue -= this->m_PreFactor * std::exp( -distance / this->m_Denominator );
}
return localValue;
}
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
void
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::GetLocalNeighborhoodValueAndDerivative( const PointType & point,
MeasureType &measure, LocalDerivativeType &localDerivative, const PixelType & itkNotUsed( pixel ) ) const
{
Array<MeasureType> measureValues;
measureValues.SetSize( this->m_EvaluationKNeighborhood );
measureValues.Fill( 0.0 );
measure = NumericTraits< MeasureType >::ZeroValue();
localDerivative.Fill( 0.0 );
PointType weightedPoint;
weightedPoint.Fill( 0.0 );
NeighborsIdentifierType neighborhood;
this->m_MovingTransformedPointsLocator->FindClosestNPoints( point, this->m_EvaluationKNeighborhood, neighborhood );
for( NeighborsIterator it = neighborhood.begin(); it != neighborhood.end(); ++it )
{
PointType neighbor = this->m_MovingTransformedPointSet->GetPoint( *it );
const MeasureType distance = point.SquaredEuclideanDistanceTo( neighbor );
measureValues[it - neighborhood.begin()] = -this->m_PreFactor * std::exp( -distance / this->m_Denominator );
measure += measureValues[it - neighborhood.begin()];
}
if ( std::fabs(measure) <= NumericTraits<MeasureType>::epsilon() )
{
return;
}
for( NeighborsIterator it = neighborhood.begin(); it != neighborhood.end(); ++it )
{
PointType neighbor = this->m_MovingTransformedPointSet->GetPoint( *it );
VectorType neighborVector = neighbor.GetVectorFromOrigin();
weightedPoint += ( neighborVector * measureValues[it - neighborhood.begin()] / measure );
}
const MeasureType distance = point.SquaredEuclideanDistanceTo( weightedPoint );
const MeasureType weight = this->m_PreFactor * std::exp( -distance / this->m_Denominator ) / -measure;
VectorType force = ( weightedPoint - point ) * weight;
for( unsigned int d = 0; d < localDerivative.Size(); d++ )
{
localDerivative[d] = force[d];
}
}
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
typename LightObject::Pointer
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::InternalClone( void ) const
{
typename Self::Pointer rval = Self::New();
rval->SetMovingPointSet( this->m_MovingPointSet );
rval->SetFixedPointSet( this->m_FixedPointSet );
rval->SetPointSetSigma( this->m_PointSetSigma );
rval->SetEvaluationKNeighborhood( this->m_EvaluationKNeighborhood );
return rval.GetPointer();
}
template<typename TFixedPointSet, typename TMovingPointSet, class TInternalComputationValueType>
void
ExpectationBasedPointSetToPointSetMetricv4<TFixedPointSet, TMovingPointSet, TInternalComputationValueType>
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf( os, indent );
os << indent << "PointSetSigma: " << this->m_PointSetSigma << std::endl;
os << indent << "EvaluateKNeighborhood: " << this->m_EvaluationKNeighborhood << std::endl;
}
} // end namespace itk
#endif