otbMuellerToReciprocalCovarianceImageFilter.h

Go to the documentation of this file.

/*
 * 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 otbMuellerToReciprocalCovarianceImageFilter_h
#define otbMuellerToReciprocalCovarianceImageFilter_h
 
#include "otbFunctorImageFilter.h"
 
namespace otb
{
 
namespace Functor
{
 
template <class TInput, class TOutput>
class MuellerToReciprocalCovarianceFunctor
{
public:
  typedef std::complex<double>        ComplexType;
  typedef typename TOutput::ValueType OutputValueType;
 
  inline void operator()(TOutput& result, const TInput& Mueller) const
  {
    // Keep the upper diagonal of the matrix
    const double M11 = static_cast<double>(Mueller[0]);
    const double M12 = static_cast<double>(Mueller[1]);
    const double M13 = static_cast<double>(Mueller[2]);
    const double M14 = static_cast<double>(Mueller[3]);
    const double M22 = static_cast<double>(Mueller[5]);
    const double M23 = static_cast<double>(Mueller[6]);
    const double M24 = static_cast<double>(Mueller[7]);
    const double M33 = static_cast<double>(Mueller[10]);
    const double M34 = static_cast<double>(Mueller[11]);
    const double M44 = static_cast<double>(Mueller[15]);
 
 
    const ComplexType A(0.5 * (M11 + M22 + 2 * M12));
    const ComplexType B(0.5 * std::sqrt(2.0) * (M13 + M23), 0.5 * std::sqrt(2.0) * (M14 + M24));
    const ComplexType C(-0.5 * (M33 + M44), -M34);
    const ComplexType E(M11 - M22, 0.0);
    const ComplexType F(0.5 * std::sqrt(2.0) * (M13 - M23), 0.5 * std::sqrt(2.0) * (M14 - M24));
    const ComplexType I(0.5 * (M11 + M22 - 2 * M12));
 
    result[0] = static_cast<OutputValueType>(A);
    result[1] = static_cast<OutputValueType>(B);
    result[2] = static_cast<OutputValueType>(C);
    result[3] = static_cast<OutputValueType>(E);
    result[4] = static_cast<OutputValueType>(F);
    result[5] = static_cast<OutputValueType>(I);
  }
 
  constexpr size_t OutputSize(...) const
  {
    // Size of the result
    return 6;
  }
};
} // namespace Functor
 
template <typename TInputImage, typename TOutputImage>
using MuellerToReciprocalCovarianceImageFilter =
    FunctorImageFilter<Functor::MuellerToReciprocalCovarianceFunctor<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
 
 
} // end namespace otb
 
#endif