mitkGradientDescentOptimizer.h

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

  Program:   3DMed
  Date:      $Date: 2014-02-25 18:30:00 +0800 $
  Version:   $Version: 4.6.0 $
  Copyright: MIPG, Institute of Automation, Chinese Academy of Sciences

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


#ifndef __mitkGradientDescentOptimizer_h
#define __mitkGradientDescentOptimizer_h

#include "mitkOptimizer.h"

class MITK_REGISTRATION_API mitkGradientDescentOptimizer : public mitkOptimizer
{
public:
    MITK_TYPE(mitkGradientDescentOptimizer, mitkOptimizer)  
    virtual void PrintSelf(ostream &os);

    mitkGradientDescentOptimizer();
    
    double GetCurrentStepLength() { return m_CurrentStepLength; }

    double GetMaximumStepLength() { return m_MaximumStepLength; }

    double GetMinimumStepLength() { return m_MinimumStepLength; }

    void SetCurrentStepLength(double length) { m_CurrentStepLength = length; }

    void SetMaximumStepLength(double length) { m_MaximumStepLength = length; }

    void SetMinimumStepLength(double length) { m_MinimumStepLength = length; }

    void SetGradientMagnitudeTolerance(double tolerance) 
            { m_GradientMagnitudeTolerance = tolerance; }

    void SetRelaxationFactor(double factor) { m_RelaxationFactor = factor; }
    
protected:
    virtual ~mitkGradientDescentOptimizer();    
    virtual bool Execute();
    void AdvanceOneStep( void );
    void StepAlongGradientVector( const double &factor, VectorParameterType &transformedGradient);
    void StepAlongGradientVersor( const double &factor, VectorParameterType &transformedGradient);

private:
    mitkGradientDescentOptimizer(const mitkGradientDescentOptimizer&);
    void operator = (const mitkGradientDescentOptimizer&);

protected:
    VectorParameterType             m_Gradient; 
    VectorParameterType             m_PreviousGradient; 

    double                          m_Value;
    double                          m_PreviousValue;
    double                          m_GradientMagnitudeTolerance;
    double                          m_MaximumStepLength;
    double                          m_MinimumStepLength;
    double                          m_CurrentStepLength;
    double                          m_RelaxationFactor;
};


//#define DEFINED_mitkGradientDescentOptimizer



#endif

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