otbMRFEnergyGaussianClassification.h

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/*
 * Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * 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
 *
 * 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 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) override
  {
    Superclass::SetNumberOfParameters(nParameters);
    this->m_Parameters.SetSize(nParameters);
    this->Modified();
  }
 
  double GetSingleValue(const InputImagePixelType& value1, const LabelledImagePixelType& value2) override
  {
    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])) +
        std::log(std::sqrt(CONST_2PI) * this->m_Parameters[2 * static_cast<int>(value2) + 1]);
 
    return static_cast<double>(result);
  }
 
protected:
  // The constructor and destructor.
  MRFEnergyGaussianClassification(){};
  ~MRFEnergyGaussianClassification() override
  {
  }
};
}
 
#endif