otbReciprocalCoherencyToReciprocalMuellerImageFilter.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 otbReciprocalCoherencyToReciprocalMuellerImageFilter_h
#define otbReciprocalCoherencyToReciprocalMuellerImageFilter_h
 
#include "otbFunctorImageFilter.h"
 
namespace otb
{
 
namespace Functor
{
 
template <class TInput, class TOutput>
class ReciprocalCoherencyToReciprocalMuellerFunctor
{
public:
  typedef typename std::complex<double> ComplexType;
  typedef typename TOutput::ValueType   OutputValueType;
 
  inline void operator()(TOutput& result, const TInput& Coherency) const
  {
    const double T1 = static_cast<double>(Coherency[0].real());
    const double T2 = static_cast<double>(Coherency[3].real());
    const double T3 = static_cast<double>(Coherency[5].real());
 
    ComplexType VAL4 = static_cast<ComplexType>((Coherency[1] - Coherency[3]));
    ComplexType VAL5 = static_cast<ComplexType>((Coherency[1] - Coherency[0]));
    ComplexType VAL0 = static_cast<ComplexType>(Coherency[5]) + VAL5 - std::conj(VAL4);
    ComplexType VAL1 = static_cast<ComplexType>(-Coherency[5]) + VAL5 - std::conj(VAL4);
 
    result[0]  = 0.5 * (T1 + T2 + T3);
    result[1]  = static_cast<double>(Coherency[1].real() + Coherency[3].imag());
    result[2]  = static_cast<double>(Coherency[2].real());
    result[3]  = static_cast<double>(Coherency[4].imag());
    result[4]  = static_cast<double>(Coherency[1].real());
    result[5]  = 0.5 * (T1 + T2 - T3);
    result[6]  = static_cast<double>(Coherency[4].real());
    result[7]  = static_cast<double>(Coherency[2].imag());
    result[8]  = static_cast<double>(-Coherency[2].real());
    result[9]  = static_cast<double>(-Coherency[4].real());
    result[10] = static_cast<double>(0.5 * VAL1.real());
    result[11] = static_cast<double>(0.5 * VAL0.imag());
    result[12] = static_cast<double>(Coherency[4].imag());
    result[13] = static_cast<double>(Coherency[2].imag());
    result[14] = static_cast<double>(0.5 * std::conj(VAL1).imag());
    result[15] = static_cast<double>(0.5 * VAL0.real());
  }
 
  constexpr size_t OutputSize(...) const
  {
    // Size of the reciprocal mueller matrix
    return 16;
  }
};
} // namespace Functor
 
template <typename TInputImage, typename TOutputImage>
using ReciprocalCoherencyToReciprocalMuellerImageFilter =
    FunctorImageFilter<Functor::ReciprocalCoherencyToReciprocalMuellerFunctor<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
 
} // end namespace otb
 
#endif