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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 ManhattanDistanceMetric. 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:
ITK_DISALLOW_COPY_AND_MOVE(DistanceToCentroidMembershipFunction);
/** Standard class type aliases */
using Self = DistanceToCentroidMembershipFunction;
using Superclass = MembershipFunctionBase<TVector>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(DistanceToCentroidMembershipFunction);
itkNewMacro(Self);
/** SmartPointer class for superclass */
using MembershipFunctionPointer = typename Superclass::Pointer;
/** Typedef alias for the measurement vectors */
using MeasurementVectorType = TVector;
/** Typedef to represent the length of measurement vectors */
using typename Superclass::MeasurementVectorSizeType;
/** Set the length of each measurement vector. */
void SetMeasurementVectorSize(MeasurementVectorSizeType) override;
/** Type of the DistanceMetric to use */
using DistanceMetricType = DistanceMetric<MeasurementVectorType>;
using DistanceMetricPointer = typename DistanceMetricType::Pointer;
using CentroidType = typename DistanceMetricType::OriginType;
/** 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 override;
protected:
DistanceToCentroidMembershipFunction();
~DistanceToCentroidMembershipFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Return a copy of the current membership function */
typename LightObject::Pointer
InternalClone() const override;
private:
DistanceMetricPointer m_DistanceMetric{};
};
} // end of namespace Statistics
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkDistanceToCentroidMembershipFunction.hxx"
#endif
#endif
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