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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 itkGaussianMixtureModelComponent_h
#define itkGaussianMixtureModelComponent_h
#include "itkMixtureModelComponentBase.h"
#include "itkGaussianMembershipFunction.h"
#include "itkWeightedMeanSampleFilter.h"
#include "itkWeightedCovarianceSampleFilter.h"
namespace itk
{
namespace Statistics
{
/**
* \class GaussianMixtureModelComponent
* \brief is a component (derived from MixtureModelComponentBase) for
* Gaussian class. This class is used in
* ExpectationMaximizationMixtureModelEstimator.
*
* On every iteration of EM estimation, this class's GenerateData
* method is called to compute the new distribution parameters.
*
* <b>Recent API changes:</b>
* The static const macro to get the length of a measurement vector,
* \c MeasurementVectorSize has been removed to allow the length of a measurement
* vector to be specified at run time. It is now obtained at run time from the
* sample set as input. Please use the function
* GetMeasurementVectorSize() to get the length.
*
* \sa MixtureModelComponentBase, ExpectationMaximizationMixtureModelEstimator
* \ingroup ITKStatistics
*/
template <typename TSample>
class ITK_TEMPLATE_EXPORT GaussianMixtureModelComponent : public MixtureModelComponentBase<TSample>
{
public:
/**Standard class type aliases. */
using Self = GaussianMixtureModelComponent;
using Superclass = MixtureModelComponentBase<TSample>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/**Standard Macros */
itkOverrideGetNameOfClassMacro(GaussianMixtureModelComponent);
itkNewMacro(Self);
/** Typedefs from the superclass */
using typename Superclass::MeasurementVectorType;
using typename Superclass::MeasurementVectorSizeType;
using typename Superclass::MembershipFunctionType;
using typename Superclass::WeightArrayType;
using typename Superclass::ParametersType;
/** Type of the membership function. Gaussian density function */
using NativeMembershipFunctionType = GaussianMembershipFunction<MeasurementVectorType>;
/** Types of the mean and the covariance calculator that will update
* this component's distribution parameters */
using MeanEstimatorType = WeightedMeanSampleFilter<TSample>;
using CovarianceEstimatorType = WeightedCovarianceSampleFilter<TSample>;
/** Type of the mean vector */
using MeanVectorType = typename MeanEstimatorType::OutputType;
/** Type of the covariance matrix */
using CovarianceMatrixType = typename CovarianceEstimatorType::OutputType;
/** Sets the input sample */
void
SetSample(const TSample * sample) override;
/** Sets the component's distribution parameters. */
void
SetParameters(const ParametersType & parameters) override;
protected:
GaussianMixtureModelComponent();
~GaussianMixtureModelComponent() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Returns the sum of squared changes in parameters between
* iterations */
double
CalculateParametersChange();
/** Computes the new distribution parameters */
void
GenerateData() override;
private:
typename NativeMembershipFunctionType::Pointer m_GaussianMembershipFunction{};
typename MeanEstimatorType::MeasurementVectorType m_Mean{};
typename CovarianceEstimatorType::MatrixType m_Covariance{};
typename MeanEstimatorType::Pointer m_MeanEstimator{};
typename CovarianceEstimatorType::Pointer m_CovarianceEstimator{};
}; // end of class
} // end of namespace Statistics
} // end of namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkGaussianMixtureModelComponent.hxx"
#endif
#endif
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