itkMixtureModelComponentBase.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
 *
 *         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 itkMixtureModelComponentBase_h
#define itkMixtureModelComponentBase_h

#include "vnl/vnl_vector.h"
#include "vnl/vnl_matrix.h"

#include "itkArray.h"
#include "itkObject.h"
#include "itkMembershipFunctionBase.h"

namespace itk
{
namespace Statistics
{
template< typename TSample >
class ITK_TEMPLATE_EXPORT MixtureModelComponentBase:
  public Object
{
public:
  using Self = MixtureModelComponentBase;
  using Superclass = Object;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(MixtureModelComponentBase, Object);

  using MeasurementVectorType = typename TSample::MeasurementVectorType;
  using MeasurementVectorSizeType = typename TSample::MeasurementVectorSizeType;

  using MembershipFunctionType = MembershipFunctionBase<MeasurementVectorType>;

  using WeightArrayType = Array< double >;

  using ParametersType = Array< double >;

  virtual void SetSample(const TSample *sample);

  const TSample * GetSample() const;

  MembershipFunctionType * GetMembershipFunction();

  void SetMinimalParametersChange(double change)
  {
    m_MinimalParametersChange = change;
  }

  double GetMinimalParametersChange()
  {
    return m_MinimalParametersChange;
  }

  virtual void SetParameters(const ParametersType & parameters);

  virtual ParametersType GetFullParameters()
  {
    return m_Parameters;
  }

  void AreParametersModified(bool flag);

  bool AreParametersModified();

  void SetWeight(unsigned int index, double value);

  double GetWeight(unsigned int index) const;

  double Evaluate(MeasurementVectorType & measurements);

  itkGetConstReferenceMacro(Weights, WeightArrayType);

  virtual void Update();

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

  void SetMembershipFunction(MembershipFunctionType *function);

  virtual void GenerateData() = 0;

private:
  const TSample *m_Sample;

  double m_MinimalParametersChange;

  ParametersType m_Parameters;

  MembershipFunctionType *m_MembershipFunction;

  WeightArrayType m_Weights;

  bool m_ParametersModified;
};  // end of class
} // end of namespace Statistics
} // end of namespace itk

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

#endif