itkSigmoidTransferFunction.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSigmoidTransferFunction.h,v $
  Language:  C++
  Date:      $Date: 2009-01-28 21:04:59 $
  Version:   $Revision: 1.3 $

  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 __itkSigmoidTransferFunction_h
#define __itkSigmoidTransferFunction_h

#include "itkTransferFunctionBase.h"

namespace itk
{
namespace Statistics
{

template<class ScalarType>
class SigmoidTransferFunction : public TransferFunctionBase<ScalarType>
{

public:

  typedef SigmoidTransferFunction          Self;
  typedef TransferFunctionBase<ScalarType> Superclass;
  typedef SmartPointer<Self>               Pointer;
  typedef SmartPointer<const Self>         ConstPointer;

  itkTypeMacro(SigmoidTransferFunction, TransferFunctionBase);

  itkNewMacro(Self);

  itkSetMacro(Alpha,ScalarType);
  itkGetMacro(Alpha,ScalarType);
  itkSetMacro(Beta,ScalarType);
  itkGetMacro(Beta,ScalarType);
  itkSetMacro(OutputMinimum,ScalarType);
  itkGetMacro(OutputMinimum,ScalarType);
  itkSetMacro(OutputMaximum,ScalarType);
  itkGetMacro(OutputMaximum,ScalarType);

  virtual ScalarType Evaluate(const ScalarType& input) const;

  virtual ScalarType EvaluateDerivative(const ScalarType& input) const;

protected:

  SigmoidTransferFunction();
  virtual ~SigmoidTransferFunction();

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

private:

  ScalarType m_Alpha;
  ScalarType m_Beta;
  ScalarType m_OutputMinimum;
  ScalarType m_OutputMaximum;
};

} // end namespace Statistics
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
  #include "itkSigmoidTransferFunction.txx"
#endif

#endif

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