otbMeanRatio.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 otbMeanRatio_h
#define otbMeanRatio_h
 
#include "otbBinaryFunctorNeighborhoodImageFilter.h"
 
namespace otb
{
 
namespace Functor
{
 
template <class TInput1, class TInput2, class TOutput>
class MeanRatio
{
public:
  MeanRatio()
  {
  }
  virtual ~MeanRatio()
  {
  }
  inline TOutput operator()(const TInput1& itA, const TInput2& itB)
  {
 
    TOutput meanA = 0.0;
    TOutput meanB = 0.0;
 
    for (unsigned long pos = 0; pos < itA.Size(); ++pos)
    {
 
      meanA += static_cast<TOutput>(itA.GetPixel(pos));
      meanB += static_cast<TOutput>(itB.GetPixel(pos));
    }
 
    meanA /= itA.Size();
    meanB /= itB.Size();
 
    // std::cout<<"meanA= "<<meanA<<", meanB= "<<meanB<<std::endl;
 
    TOutput ratio;
 
    if (meanA == meanB)
      ratio = 0.;
    else if (meanA > meanB)
      ratio = static_cast<TOutput>(1.0 - meanB / meanA);
    else
      ratio = static_cast<TOutput>(1.0 - meanA / meanB);
 
    return ratio;
  }
};
}
} // end namespace otb
 
#endif