itkPowellOptimizer.h

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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 __itkPowellOptimizer_h
#define __itkPowellOptimizer_h

#include "itkVector.h"
#include "itkMatrix.h"
#include "itkSingleValuedNonLinearOptimizer.h"

namespace itk
{
class ITK_EXPORT PowellOptimizer:
  public SingleValuedNonLinearOptimizer
{
public:
  typedef PowellOptimizer                Self;
  typedef SingleValuedNonLinearOptimizer Superclass;
  typedef SmartPointer< Self >           Pointer;
  typedef SmartPointer< const Self >     ConstPointer;

  typedef SingleValuedNonLinearOptimizer::ParametersType
  ParametersType;

  itkNewMacro(Self);

  itkTypeMacro(PowellOptimizer, SingleValuedNonLinearOptimizer);

  typedef  SingleValuedCostFunction  CostFunctionType;
  typedef  CostFunctionType::Pointer CostFunctionPointer;

  itkSetMacro(Maximize, bool);
  itkBooleanMacro(Maximize);
  itkGetConstReferenceMacro(Maximize, bool);

  itkSetMacro(MaximumIteration, unsigned int);
  itkGetConstReferenceMacro(MaximumIteration, unsigned int);

  itkSetMacro(MaximumLineIteration, unsigned int);
  itkGetConstMacro(MaximumLineIteration, unsigned int);

  itkSetMacro(StepLength, double);
  itkGetConstReferenceMacro(StepLength, double);

  itkSetMacro(StepTolerance, double);
  itkGetConstReferenceMacro(StepTolerance, double);

  itkSetMacro(ValueTolerance, double);
  itkGetConstReferenceMacro(ValueTolerance, double);

  itkGetConstReferenceMacro(CurrentCost, MeasureType);
  MeasureType GetValue() const { return this->GetCurrentCost(); }

  itkGetConstReferenceMacro(CurrentIteration, unsigned int);

  itkGetConstReferenceMacro(CurrentLineIteration, unsigned int);

  void StartOptimization();

  void StopOptimization()
  { m_Stop = true; }

  itkGetConstReferenceMacro(CatchGetValueException, bool);
  itkSetMacro(CatchGetValueException, bool);

  itkGetConstReferenceMacro(MetricWorstPossibleValue, double);
  itkSetMacro(MetricWorstPossibleValue, double);

  const std::string GetStopConditionDescription() const;

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

  itkSetMacro(CurrentCost, double);

  void SetLine(const ParametersType & origin,
               const vnl_vector< double > & direction);

  double GetLineValue(double x) const;

  double GetLineValue(double x, ParametersType & tempCoord) const;

  void   SetCurrentLinePoint(double x, double fx);

  void   Swap(double *a, double *b) const;

  void   Shift(double *a, double *b, double *c, double d) const;

  virtual void   LineBracket(double *ax, double *bx, double *cx,
                             double *fa, double *fb, double *fc);

  virtual void   LineBracket(double *ax, double *bx, double *cx,
                             double *fa, double *fb, double *fc,
                             ParametersType & tempCoord);

  virtual void   BracketedLineOptimize(double ax, double bx, double cx,
                                       double fa, double fb, double fc,
                                       double *extX, double *extVal);

  virtual void   BracketedLineOptimize(double ax, double bx, double cx,
                                       double fa, double fb, double fc,
                                       double *extX, double *extVal,
                                       ParametersType & tempCoord);

  itkGetMacro(SpaceDimension, unsigned int);
  void SetSpaceDimension(unsigned int dim)
  {
    this->m_SpaceDimension = dim;
    this->m_LineDirection.set_size(dim);
    this->m_LineOrigin.set_size(dim);
    this->m_CurrentPosition.set_size(dim);
    this->Modified();
  }

  itkSetMacro(CurrentIteration, unsigned int);

  itkGetMacro(Stop, bool);
  itkSetMacro(Stop, bool);

private:
  unsigned int m_SpaceDimension;

  unsigned int m_CurrentIteration;
  unsigned int m_CurrentLineIteration;

  unsigned int m_MaximumIteration;
  unsigned int m_MaximumLineIteration;

  bool   m_CatchGetValueException;
  double m_MetricWorstPossibleValue;

  bool m_Maximize;

  double m_StepLength;
  double m_StepTolerance;

  ParametersType       m_LineOrigin;
  vnl_vector< double > m_LineDirection;

  double m_ValueTolerance;

  MeasureType m_CurrentCost;

  bool m_Stop;

  std::ostringstream m_StopConditionDescription;
}; // end of class
} // end of namespace itk

#endif