otbCzihoSOMNeighborhoodBehaviorFunctor.h

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/*
 * Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
 * Copyright (C) 2007-2012 Institut Mines Telecom / Telecom Bretagne
 *
 * 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 otbCzihoSOMNeighborhoodBehaviorFunctor_h
#define otbCzihoSOMNeighborhoodBehaviorFunctor_h
 
#include "itkSize.h"
#include "itkMath.h"
 
namespace otb
{
 
namespace Functor
{
 
class CzihoSOMNeighborhoodBehaviorFunctor
{
public:
  CzihoSOMNeighborhoodBehaviorFunctor()
  {
  }
  virtual ~CzihoSOMNeighborhoodBehaviorFunctor()
  {
  }
 
  template <unsigned int VDimension>
  itk::Size<VDimension> operator()(unsigned int currentIteration, unsigned int numberOfIterations, const itk::Size<VDimension>& sizeInit) const
  {
    itk::Size<VDimension> theSize;
    double                weightening = ::std::pow(1.0 - static_cast<double>(currentIteration) / static_cast<double>(numberOfIterations), 2.0);
    for (unsigned int i = 0; i < VDimension; ++i)
    {
      theSize[i] = static_cast<typename itk::Size<VDimension>::SizeValueType>(static_cast<double>(sizeInit[i]) * weightening);
    }
 
    return theSize;
  }
 
}; // end of class CzihoSOMNeighborhoodBehaviorFunctor
 
} // end namespace Functor
 
} // end namespace otb
 
#endif