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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkMeanCalculator.h,v $
Language: C++
Date: $Date: 2009-03-04 15:23:58 $
Version: $Revision: 1.12 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkMeanCalculator_h
#define __itkMeanCalculator_h
#include "itkSampleAlgorithmBase.h"
#include "itkArray.h"
namespace itk {
namespace Statistics {
/** \class MeanCalculator
* \brief calculates sample mean
*
* You plug in the target sample data using SetSample method. Then call
* the GenerateData method to run the alogithm.
*
* The return value that the GetOutput method
* \f$ = \frac{1}{n}\sum^{n}_{i=1}x_{i}\f$ where \f$n\f$ is the
* number of measurement vectors in the target
*
* Recent API changes:
* The static const macro to get the length of a measurement vector,
* 'MeasurementVectorSize' has been removed to allow the length of a measurement
* vector to be specified at run time. It is now obtained from the input sample.
* Please use the function GetMeasurementVectorSize() to obtain the length.
* The mean output is an Array rather than a Vector.
*/
template< class TSample >
class MeanCalculator :
public SampleAlgorithmBase< TSample >
{
public:
/**Standard class typedefs. */
typedef MeanCalculator Self;
typedef SampleAlgorithmBase< TSample > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/**Standard Macros */
itkTypeMacro(MeanCalculator, SampleAlgorithmBase);
itkNewMacro(Self);
/** Length of a measurement vector */
typedef typename Superclass::MeasurementVectorSizeType MeasurementVectorSizeType;
/** Measurement vector type */
typedef typename Superclass::MeasurementVectorType MeasurementVectorType;
/** Typedef for the mean output */
typedef Array< double > OutputType;
/** Returns the mean vector */
OutputType* GetOutput();
protected:
MeanCalculator();
virtual ~MeanCalculator() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** Calculates the mean and save it */
void GenerateData();
private:
/** Internal mean value storage */
OutputType m_Output;
}; // end of class
} // end of namespace Statistics
} // end of namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMeanCalculator.txx"
#endif
#endif
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