itkBayesianClassifierInitializationImageFilter.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 itkBayesianClassifierInitializationImageFilter_h
#define itkBayesianClassifierInitializationImageFilter_h

#include "itkVectorImage.h"
#include "itkVectorContainer.h"
#include "itkImageToImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkMembershipFunctionBase.h"

namespace itk
{
template< typename TInputImage, typename TProbabilityPrecisionType = float >
class ITK_TEMPLATE_EXPORT BayesianClassifierInitializationImageFilter:
  public
  ImageToImageFilter< TInputImage, VectorImage< TProbabilityPrecisionType,
                                                TInputImage::ImageDimension > >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(BayesianClassifierInitializationImageFilter);

  using Self = BayesianClassifierInitializationImageFilter;
  using InputImageType = TInputImage;
  using ProbabilityPrecisionType = TProbabilityPrecisionType;

  static constexpr unsigned int Dimension = InputImageType ::ImageDimension;

  using OutputImageType = VectorImage< ProbabilityPrecisionType,
                       Self::Dimension >;
  using Superclass = ImageToImageFilter< InputImageType, OutputImageType >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(BayesianClassifierInitializationImageFilter, ImageToImageFilter);

  using InputImageIteratorType = ImageRegionConstIterator< InputImageType >;

  using InputPixelType = typename InputImageType::PixelType;
  using OutputPixelType = typename OutputImageType::PixelType;

  using MembershipImageType = VectorImage< ProbabilityPrecisionType,
                       Self::Dimension >;
  using MembershipPixelType = typename MembershipImageType::PixelType;
  using MembershipImagePointer = typename MembershipImageType::Pointer;
  using MembershipImageIteratorType = ImageRegionIterator< MembershipImageType >;

  using MeasurementVectorType = Vector< InputPixelType, 1 >;

  using MembershipFunctionType = Statistics::MembershipFunctionBase< MeasurementVectorType >;
  using MembershipFunctionPointer = typename MembershipFunctionType::Pointer;

  using MembershipFunctionContainerType = VectorContainer< unsigned int,
                           MembershipFunctionPointer >;
  using MembershipFunctionContainerPointer = typename MembershipFunctionContainerType::Pointer;

  virtual void SetMembershipFunctions(MembershipFunctionContainerType
                                      *densityFunctionContainer);
  itkGetModifiableObjectMacro(MembershipFunctionContainer, MembershipFunctionContainerType);

  itkSetMacro(NumberOfClasses, unsigned int);
  itkGetConstMacro(NumberOfClasses, unsigned int);

  void GenerateOutputInformation() override;

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( InputMultiplyOperatorCheck,
                   ( Concept::MultiplyOperator< InputPixelType > ) );
  itkConceptMacro( DoubleConvertibleToProbabilityCheck,
                   ( Concept::Convertible< double, TProbabilityPrecisionType > ) );
  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< InputPixelType > ) );
  itkConceptMacro( ProbabilityHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< TProbabilityPrecisionType > ) );
  itkConceptMacro( DoublePlusInputCheck,
                   ( Concept::AdditiveOperators< double, InputPixelType > ) );
  // End concept checking
#endif

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

  virtual void InitializeMembershipFunctions();

  void GenerateData() override;

private:
  bool         m_UserSuppliesMembershipFunctions{false};
  unsigned int m_NumberOfClasses{0};

  typename MembershipFunctionContainerType::Pointer m_MembershipFunctionContainer;
};
} // end namespace itk

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

#endif