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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 itkDistanceToCentroidMembershipFunction_h
#define itkDistanceToCentroidMembershipFunction_h
#include "itkMembershipFunctionBase.h"
#include "itkDistanceMetric.h"
namespace itk
{
namespace Statistics
{
/** \class DistanceToCentroidMembershipFunction
* \brief DistanceToCentroidMembershipFunction models class membership
* using a distance metric.
*
* DistanceToCentroidMembershipFunction is a subclass of
* MembershipFunctionBase that models class membership using the
* distance to the centroid of the class. A choice of distance metric
* can be specified using the SetDistanceMetric() method. Options
* include EuclideanDistanceMetric, EuclideanSquaredDistanceMetric,
* and ManhattenDistanceMetric. The centroid of the class is specified
* using the SetCentroid() method. Any other parameters to control the
* distance function evaluation have to be set directly on the
* distance function itself.
*
* \ingroup ITKStatistics
*/
template< typename TVector >
class ITK_TEMPLATE_EXPORT DistanceToCentroidMembershipFunction:
public MembershipFunctionBase< TVector >
{
public:
/** Standard class typedefs */
typedef DistanceToCentroidMembershipFunction Self;
typedef MembershipFunctionBase< TVector > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Strandard macros */
itkTypeMacro(DistanceToCentroidMembershipFunction,
MembershipFunctionBase);
itkNewMacro(Self);
/** SmartPointer class for superclass */
typedef typename Superclass::Pointer MembershipFunctionPointer;
/** Typedef alias for the measurement vectors */
typedef TVector MeasurementVectorType;
/** Typedef to represent the length of measurement vectors */
typedef typename Superclass::MeasurementVectorSizeType
MeasurementVectorSizeType;
/** Set the length of each measurement vector. */
virtual void SetMeasurementVectorSize(MeasurementVectorSizeType) ITK_OVERRIDE;
/** Type of the DistanceMetric to use */
typedef DistanceMetric< MeasurementVectorType > DistanceMetricType;
typedef typename DistanceMetricType::Pointer DistanceMetricPointer;
typedef typename DistanceMetricType::OriginType CentroidType;
/** Set the DistanceMetric to be used when calling the Evaluate() method */
itkSetObjectMacro(DistanceMetric, DistanceMetricType);
/** Get the DistanceMetric used by the MembershipFunction */
itkGetModifiableObjectMacro(DistanceMetric, DistanceMetricType);
/** Get the DistanceMetric used by the MembershipFunction. This is
* a non-const version that allows you to configure the distance
* function directly. */
/** Set the centroid of the class (propagated to the DistanceMetric) */
void SetCentroid(const CentroidType & centroid);
/** Get the centroid of the class (requested from the DistanceMetric */
const CentroidType & GetCentroid() const;
/**
* Method to get probability of an instance. The return value is the
* value of the density function, not probability. */
double Evaluate(const MeasurementVectorType & measurement) const ITK_OVERRIDE;
protected:
DistanceToCentroidMembershipFunction();
virtual ~DistanceToCentroidMembershipFunction() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Return a copy of the current membership function */
virtual typename LightObject::Pointer InternalClone() const ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(DistanceToCentroidMembershipFunction);
DistanceMetricPointer m_DistanceMetric;
};
} // end of namespace Statistics
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDistanceToCentroidMembershipFunction.hxx"
#endif
#endif
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