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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 itkWeightedCovarianceSampleFilter_h
#define itkWeightedCovarianceSampleFilter_h
#include "itkFunctionBase.h"
#include "itkCovarianceSampleFilter.h"
#include "itkDataObjectDecorator.h"
namespace itk
{
namespace Statistics
{
/** \class WeightedCovarianceSampleFilter
* \brief Calculates the covariance matrix of the target sample data.
* where each measurement vector has an associated weight value
*
* Weight values can be specified in two ways: using a weighting function
* or an array containing weight values. If none of these two is specified,
* the covariance matrix is generated with equal weights.
*
* \sa CovarianceSampleFilter
*
* \ingroup ITKStatistics
*/
template< typename TSample >
class ITK_TEMPLATE_EXPORT WeightedCovarianceSampleFilter:
public CovarianceSampleFilter< TSample >
{
public:
/** Standard class typedefs. */
typedef WeightedCovarianceSampleFilter Self;
typedef CovarianceSampleFilter< TSample > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Standard Macros */
itkTypeMacro(WeightedCovarianceSampleFilter, CovarianceSampleFilter);
itkNewMacro(Self);
/** Types derived from the base class */
typedef typename Superclass::SampleType SampleType;
typedef typename Superclass::MeasurementVectorType MeasurementVectorType;
typedef typename Superclass::MeasurementVectorSizeType MeasurementVectorSizeType;
typedef typename Superclass::MeasurementType MeasurementType;
/** Types derived from the base class */
typedef typename Superclass::MeasurementVectorRealType MeasurementVectorRealType;
typedef typename Superclass::MeasurementRealType MeasurementRealType;
/** Type of weight values */
typedef double WeightValueType;
/** Array type for weights */
typedef Array< WeightValueType > WeightArrayType;
/** Type of DataObjects to use for the weight array type */
typedef SimpleDataObjectDecorator< WeightArrayType > InputWeightArrayObjectType;
/** Method to set the input value of the weight array */
itkSetGetDecoratedInputMacro(Weights, WeightArrayType);
/** Weight calculation function type */
typedef FunctionBase< MeasurementVectorType, WeightValueType > WeightingFunctionType;
/** Type of DataObjects to use for Weight function */
typedef DataObjectDecorator< WeightingFunctionType > InputWeightingFunctionObjectType;
/** Method to set/get the weighting function */
itkSetGetDecoratedObjectInputMacro(WeightingFunction, WeightingFunctionType);
/** Types derived from the base class */
typedef typename Superclass::MatrixType MatrixType;
typedef typename Superclass::MatrixDecoratedType MatrixDecoratedType;
/** Types derived from the base class */
typedef typename Superclass::MeasurementVectorDecoratedType MeasurementVectorDecoratedType;
typedef typename Superclass::OutputType OutputType;
protected:
WeightedCovarianceSampleFilter();
virtual ~WeightedCovarianceSampleFilter() ITK_OVERRIDE;
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
void GenerateData() ITK_OVERRIDE;
/** Compute covariance matrix with weights computed from a function */
void ComputeCovarianceMatrixWithWeightingFunction();
/** Compute covariance matrix with weights specified in an array */
void ComputeCovarianceMatrixWithWeights();
private:
ITK_DISALLOW_COPY_AND_ASSIGN(WeightedCovarianceSampleFilter);
}; // end of class
} // end of namespace Statistics
} // end of namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkWeightedCovarianceSampleFilter.hxx"
#endif
#endif
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