itkWeightedCovarianceSampleFilter.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
 *  limitations under the License.
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#ifndef __itkWeightedCovarianceSampleFilter_h
#define __itkWeightedCovarianceSampleFilter_h

#include "itkFunctionBase.h"
#include "itkCovarianceSampleFilter.h"
#include "itkDataObjectDecorator.h"

namespace itk
{
namespace Statistics
{
template< typename TSample >
class WeightedCovarianceSampleFilter:
  public CovarianceSampleFilter< TSample >
{
public:
  typedef WeightedCovarianceSampleFilter    Self;
  typedef CovarianceSampleFilter< TSample > Superclass;
  typedef SmartPointer< Self >              Pointer;
  typedef SmartPointer< const Self >        ConstPointer;

  itkTypeMacro(WeightedCovarianceSampleFilter, CovarianceSampleFilter);
  itkNewMacro(Self);

  typedef typename Superclass::SampleType                     SampleType;
  typedef typename Superclass::MeasurementVectorType          MeasurementVectorType;
  typedef typename Superclass::MeasurementVectorSizeType      MeasurementVectorSizeType;
  typedef typename Superclass::MeasurementType                MeasurementType;

  typedef typename Superclass::MeasurementVectorRealType      MeasurementVectorRealType;
  typedef typename Superclass::MeasurementRealType            MeasurementRealType;


  typedef double WeightValueType;


  typedef Array< WeightValueType > WeightArrayType;

  typedef SimpleDataObjectDecorator< WeightArrayType > InputWeightArrayObjectType;

  itkSetGetDecoratedInputMacro(Weights, WeightArrayType);


  typedef FunctionBase< MeasurementVectorType, WeightValueType > WeightingFunctionType;

  typedef DataObjectDecorator< WeightingFunctionType > InputWeightingFunctionObjectType;

  itkSetGetDecoratedObjectInputMacro(WeightingFunction, WeightingFunctionType);


  typedef typename Superclass::MatrixType          MatrixType;
  typedef typename Superclass::MatrixDecoratedType MatrixDecoratedType;

  typedef typename Superclass::MeasurementVectorDecoratedType MeasurementVectorDecoratedType;
  typedef typename Superclass::OutputType                     OutputType;

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

  void GenerateData();

  void ComputeCovarianceMatrixWithWeightingFunction();

  void ComputeCovarianceMatrixWithWeights();

private:
  WeightedCovarianceSampleFilter(const Self &); //purposely not implemented
  void operator=(const Self &);                 //purposely not implemented

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

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

#endif