itkImageClassifierFilter.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 __itkImageClassifierFilter_h
#define __itkImageClassifierFilter_h

#include <vector>

#include "itkMembershipFunctionBase.h"
#include "itkDecisionRule.h"
#include "itkImageToImageFilter.h"
#include "itkSimpleDataObjectDecorator.h"

namespace itk
{
namespace Statistics
{
template< typename TSample, typename TInputImage, typename TOutputImage >
class ImageClassifierFilter:
  public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  typedef ImageClassifierFilter                           Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
  typedef SmartPointer< Self >                            Pointer;
  typedef SmartPointer< const Self >                      ConstPointer;

  itkTypeMacro(ImageClassifierFilter, ImageToImagefilter);
  itkNewMacro(Self);

  typedef           TInputImage            InputImageType;
  typedef           TOutputImage           OutputImageType;
  typedef typename TInputImage::PixelType  InputPixelType;
  typedef typename TOutputImage::PixelType OutputPixelType;

  typedef typename TInputImage::Pointer  InputImagePointer;
  typedef typename TOutputImage::Pointer OutputImagePointer;

  typedef typename TInputImage::SizeType    InputSizeType;
  typedef typename TInputImage::IndexType   InputIndexType;
  typedef typename TInputImage::RegionType  InputImageRegionType;
  typedef typename TOutputImage::SizeType   OutputSizeType;
  typedef typename TOutputImage::IndexType  OutputIndexType;
  typedef typename TOutputImage::RegionType OutputImageRegionType;

  itkStaticConstMacro(InputImageDimension, unsigned int,
                      TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      TOutputImage::ImageDimension);

  typedef TSample SampleType;

  typedef typename SampleType::MeasurementType       MeasurementType;
  typedef typename SampleType::MeasurementVectorType MeasurementVectorType;

  typedef MembershipFunctionBase< MeasurementVectorType > MembershipFunctionType;
  typedef typename MembershipFunctionType::ConstPointer   MembershipFunctionPointer;
  typedef std::vector< MembershipFunctionPointer >        MembershipFunctionVectorType;
  typedef SimpleDataObjectDecorator<
    MembershipFunctionVectorType >                        MembershipFunctionVectorObjectType;
  typedef typename
  MembershipFunctionVectorObjectType::Pointer MembershipFunctionVectorObjectPointer;

  typedef Array< double > MembershipFunctionsWeightsArrayType;

  typedef SimpleDataObjectDecorator<
    MembershipFunctionsWeightsArrayType >                 MembershipFunctionsWeightsArrayObjectType;
  typedef typename
  MembershipFunctionsWeightsArrayObjectType::Pointer MembershipFunctionsWeightsArrayPointer;

  typedef IdentifierType                ClassLabelType;
  typedef std::vector< ClassLabelType > ClassLabelVectorType;
  typedef SimpleDataObjectDecorator<
    ClassLabelVectorType >                            ClassLabelVectorObjectType;
  typedef ClassLabelVectorObjectType::Pointer ClassLabelVectorObjectPointer;

  typedef DecisionRule                   DecisionRuleType;
  typedef DecisionRuleType::ConstPointer DecisionRulePointer;

  void SetImage(const InputImageType *image);

  const InputImageType *  GetImage() const;

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

  itkSetConstObjectMacro(DecisionRule, DecisionRuleType);
  itkGetConstObjectMacro(DecisionRule, DecisionRuleType);

  void SetClassLabels(const ClassLabelVectorObjectType *classLabels);

  void SetMembershipFunctions(const MembershipFunctionVectorObjectType *membershipFunctions);

  void SetMembershipFunctionsWeightsArray(const MembershipFunctionsWeightsArrayObjectType *weightsArray);

protected:
  ImageClassifierFilter();
  virtual ~ImageClassifierFilter() {}
  void PrintSelf(std::ostream & os, Indent indent) const;

  ImageClassifierFilter(const Self &); //purposely not implemented
  void operator=(const Self &);        //purposely not implemented

  void GenerateData();

private:

  unsigned int m_NumberOfClasses;

  DecisionRulePointer m_DecisionRule;
};  // end of class
} // end of namespace Statistics
} // end of namespace itk

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

#endif