itkRegularStepGradientDescentBaseOptimizer.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkRegularStepGradientDescentBaseOptimizer.h,v $
  Language:  C++
  Date:      $Date: 2003/02/26 20:25:53 $
  Version:   $Revision: 1.10 $

  Copyright (c) 2002 Insight 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 __itkRegularStepGradientDescentBaseOptimizer_h
#define __itkRegularStepGradientDescentBaseOptimizer_h

#include "itkSingleValuedNonLinearOptimizer.h"

namespace itk
{
  
class ITK_EXPORT RegularStepGradientDescentBaseOptimizer : 
        public SingleValuedNonLinearOptimizer
{
public:
  typedef RegularStepGradientDescentBaseOptimizer      Self;
  typedef SingleValuedNonLinearOptimizer               Superclass;
  typedef SmartPointer<Self>                           Pointer;
  typedef SmartPointer<const Self>                     ConstPointer;
  
  itkNewMacro(Self);
  
  itkTypeMacro( RegularStepGradientDescentBaseOptimizer, 
                              SingleValuedNonLinearOptimizer );
  

  typedef enum {
    GradientMagnitudeTolerance=1,
    StepTooSmall,
    ImageNotAvailable,
    SamplesNotAvailable,
    MaximumNumberOfIterations
  } StopConditionType;

  itkSetMacro( Maximize, bool );
  itkGetMacro( Maximize, bool );
  itkBooleanMacro( Maximize );
  bool GetMinimize( ) const
    { return !m_Maximize; }
  void SetMinimize(bool v)
    { this->SetMaximize(!v); }
  void    MinimizeOn(void) 
    { SetMaximize( false ); }
  void    MinimizeOff(void) 
    { SetMaximize( true ); }

  void    StartOptimization( void );

  void    ResumeOptimization( void );

  void    StopOptimization( void );

  itkSetMacro( MaximumStepLength, double );
  itkSetMacro( MinimumStepLength, double );
  itkSetMacro( NumberOfIterations, unsigned long );
  itkSetMacro( GradientMagnitudeTolerance, double );
  itkGetConstMacro( CurrentStepLength, double);
  itkGetConstMacro( MaximumStepLength, double );
  itkGetConstMacro( MinimumStepLength, double );
  itkGetConstMacro( NumberOfIterations, unsigned long );
  itkGetConstMacro( GradientMagnitudeTolerance, double );
  itkGetConstMacro( CurrentIteration, unsigned int );
  itkGetConstMacro( StopCondition, StopConditionType );
  itkGetConstMacro( Value, MeasureType );
  
  
protected:
  RegularStepGradientDescentBaseOptimizer();
  virtual ~RegularStepGradientDescentBaseOptimizer() {};
  void PrintSelf(std::ostream& os, Indent indent) const;

  virtual void AdvanceOneStep( void );

  virtual void StepAlongGradient( 
                  double,
                  const DerivativeType&)
    {
    ExceptionObject ex;
    ex.SetLocation(__FILE__);
    ex.SetDescription("This method MUST be overloaded in derived classes");
    throw ex;
    }


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

protected:
  DerivativeType                m_Gradient; 
  DerivativeType                m_PreviousGradient; 

  bool                          m_Stop;
  bool                          m_Maximize;
  MeasureType                   m_Value;
  double                        m_GradientMagnitudeTolerance;
  double                        m_MaximumStepLength;
  double                        m_MinimumStepLength;
  double                        m_CurrentStepLength;
  StopConditionType             m_StopCondition;
  unsigned long                 m_NumberOfIterations;
  unsigned long                 m_CurrentIteration;


};

} // end namespace itk



#endif

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