itkMahalanobisDistanceMembershipFunction.h

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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
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 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
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#ifndef itkMahalanobisDistanceMembershipFunction_h
#define itkMahalanobisDistanceMembershipFunction_h

#include "itkVariableSizeMatrix.h"

#include "itkMembershipFunctionBase.h"

namespace itk
{
namespace Statistics
{
template< typename TVector >
class ITK_TEMPLATE_EXPORT MahalanobisDistanceMembershipFunction:
  public MembershipFunctionBase< TVector >
{
public:
  using Self = MahalanobisDistanceMembershipFunction;
  using Superclass = MembershipFunctionBase< TVector >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(MahalanobisDistanceMembershipFunction, MembershipFunctionBase);
  itkNewMacro(Self);

  using MembershipFunctionPointer = typename Superclass::Pointer;

  using MeasurementVectorType = TVector;

  using MeasurementVectorSizeType = typename Superclass::MeasurementVectorSizeType;

  using MeasurementVectorRealType = typename itk::NumericTraits< MeasurementVectorType >::RealType;
  using MeanVectorType = MeasurementVectorRealType;

  using CovarianceMatrixType = VariableSizeMatrix< double >;

  void SetMean(const MeanVectorType & mean);

  itkGetConstReferenceMacro(Mean, MeanVectorType);

  void SetCovariance(const CovarianceMatrixType & cov);

  itkGetConstReferenceMacro(Covariance, CovarianceMatrixType);

  double Evaluate(const MeasurementVectorType & measurement) const override;

  typename LightObject::Pointer InternalClone() const override;

protected:
  MahalanobisDistanceMembershipFunction();
  ~MahalanobisDistanceMembershipFunction() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;

private:
  MeanVectorType       m_Mean;               // mean
  CovarianceMatrixType m_Covariance;         // covariance matrix

  // inverse covariance matrix. automatically calculated
  // when covariace matirx is set.
  CovarianceMatrixType m_InverseCovariance;

  bool m_CovarianceNonsingular;
};
} // end of namespace Statistics
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMahalanobisDistanceMembershipFunction.hxx"
#endif

#endif