otbMRFEnergyGaussianClassification.h

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

  Program:   ORFEO Toolbox
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
  See OTBCopyright.txt 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 __otbMRFEnergyGaussianClassification_h
#define __otbMRFEnergyGaussianClassification_h

#include "otbMRFEnergy.h"
#include "otbMath.h"

namespace otb
{
template<class TInput1, class TInput2>
class ITK_EXPORT MRFEnergyGaussianClassification : public MRFEnergy<TInput1, TInput2>
{
public:
  typedef MRFEnergyGaussianClassification Self;
  typedef MRFEnergy<TInput1, TInput2>     Superclass;
  typedef itk::SmartPointer<Self>         Pointer;
  typedef itk::SmartPointer<const Self>   ConstPointer;

  typedef TInput1                               InputImageType;
  typedef TInput2                               LabelledImageType;
  typedef typename InputImageType::PixelType    InputImagePixelType;
  typedef typename LabelledImageType::PixelType LabelledImagePixelType;
  typedef itk::Array <double>                   ParametersType;

  itkNewMacro(Self);

  itkTypeMacro(MRFEnergyGaussianClassification, MRFEnergy);

  void SetNumberOfParameters(const unsigned int nParameters)
  {
    Superclass::SetNumberOfParameters(nParameters);
    this->m_Parameters.SetSize(nParameters);
    this->Modified();
  }

  double GetSingleValue(const InputImagePixelType& value1, const LabelledImagePixelType& value2)
  {
    if ((unsigned int) value2 >= this->GetNumberOfParameters() / 2)
      {
      itkExceptionMacro(<< "Number of parameters does not correspond to number of classes");
      }
    double val1 = static_cast<double>(value1);

    double result = vnl_math_sqr(val1 - this->m_Parameters[2 * static_cast<int>(value2)])
                    / (2 * vnl_math_sqr(this->m_Parameters[2 * static_cast<int>(value2) + 1]))
                    + vcl_log(vcl_sqrt(CONST_2PI) * this->m_Parameters[2 * static_cast<int>(value2) + 1]);

    return static_cast<double>(result);
  }

protected:
  // The constructor and destructor.
  MRFEnergyGaussianClassification() {};
  virtual ~MRFEnergyGaussianClassification() {}

};
}

#endif