itkOptimizer.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 __itkOptimizer_h
#define __itkOptimizer_h

#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkArray.h"
#include "itkOptimizerParameters.h"

namespace itk
{
class Optimizer:public Object
{
public:
  typedef Optimizer                  Self;
  typedef Object                     Superclass;
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(Optimizer, Object);

  typedef OptimizerParameters< double > ParametersType;

  typedef Array< double > ScalesType;

  virtual void SetInitialPosition(const ParametersType & param);

  itkGetConstReferenceMacro(InitialPosition, ParametersType);

  void SetScales(const ScalesType & scales);

  itkGetConstReferenceMacro(Scales, ScalesType);
  itkGetConstReferenceMacro(InverseScales, ScalesType);

  itkGetConstReferenceMacro(CurrentPosition, ParametersType);

  virtual void StartOptimization() {}

  virtual const std::string GetStopConditionDescription() const;

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

  virtual void SetCurrentPosition(const ParametersType & param);

  bool m_ScalesInitialized;

  // Keep m_CurrentPosition as a protected var so that subclasses can
  // have fast access.  This is important when optimizing high-dimensional
  // spaces, e.g. bspline transforms.
  ParametersType m_CurrentPosition;

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

  ParametersType m_InitialPosition;
  ScalesType     m_Scales;
  ScalesType     m_InverseScales;
};
} // end namespace itk

#endif