otbMRFEnergyEdgeFidelity.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 otbMRFEnergyEdgeFidelity_h
#define otbMRFEnergyEdgeFidelity_h
 
#include "otbMRFEnergy.h"
 
namespace otb
{
 
template <class TInput1, class TInput2>
class ITK_EXPORT MRFEnergyEdgeFidelity : public MRFEnergy<TInput1, TInput2>
{
public:
  typedef MRFEnergyEdgeFidelity Self;
  typedef MRFEnergy<TInput1, TInput2> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  typedef itk::ConstNeighborhoodIterator<TInput1> NeighborhoodIterator;
  typedef typename TInput1::PixelType             InputImagePixelType;
  typedef typename TInput2::PixelType             LabelledImagePixelType;
 
  itkNewMacro(Self);
 
  itkTypeMacro(MRFEnergyEdgeFidelity, MRFEnergy);
 
  double GetSingleValue(const InputImagePixelType& value1, const LabelledImagePixelType& value2) override
  {
    double val1 = static_cast<double>(value1);
    double val2 = static_cast<double>(value2);
 
    return vnl_math_sqr((val1 - val2)) / (1 + vnl_math_sqr(val1 - val2));
  }
 
protected:
  // The constructor and destructor.
  MRFEnergyEdgeFidelity(){};
  ~MRFEnergyEdgeFidelity() override
  {
  }
};
}
 
#endif