otbSinclairToMuellerMatrixImageFilter.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 otbSinclairToMuellerMatrixImageFilter_h
#define otbSinclairToMuellerMatrixImageFilter_h
 
#include <complex>
#include "otbFunctorImageFilter.h"
#include "otbPolarimetryTags.h"
 
namespace otb
{
namespace Functor
{
template <class TInput1, class TInput2, class TInput3, class TInput4, class TOutput>
class SinclairToMuellerMatrixFunctor
{
public:
  typedef typename std::complex<double> ComplexType;
  typedef typename TOutput::ValueType   OutputValueType;
  typedef double                        RealType;
 
  inline void operator()(TOutput& result, const TInput1& Shh, const TInput2& Shv, const TInput3& Svh, const TInput4& Svv) const
  {
    const ComplexType Txx = static_cast<ComplexType>(-Shh);
    const ComplexType Txy = static_cast<ComplexType>(-Shv);
    const ComplexType Tyx = static_cast<ComplexType>(Svh);
    const ComplexType Tyy = static_cast<ComplexType>(Svv);
 
    const ComplexType conjTxx = std::conj(Txx);
    const ComplexType conjTxy = std::conj(Txy);
    const ComplexType conjTyx = std::conj(Tyx);
    const ComplexType conjTyy = std::conj(Tyy);
 
    result[0]  = static_cast<OutputValueType>(0.5 * (std::norm(Txx) + std::norm(Txy) + std::norm(Tyx) + std::norm(Tyy)));
    result[1]  = static_cast<OutputValueType>(0.5 * (std::norm(Txx) - std::norm(Txy) + std::norm(Tyx) - std::norm(Tyy)));
    result[2]  = static_cast<OutputValueType>((Txx * conjTxy + Tyx * conjTyy).real());
    result[3]  = static_cast<OutputValueType>((Txx * conjTxy + Tyx * conjTyy).imag());
    result[4]  = static_cast<OutputValueType>(0.5 * (std::norm(Txx) + std::norm(Txy) - std::norm(Tyx) - std::norm(Tyy)));
    result[5]  = static_cast<OutputValueType>(0.5 * (std::norm(Txx) - std::norm(Txy) - std::norm(Tyx) + std::norm(Tyy)));
    result[6]  = static_cast<OutputValueType>((Txx * conjTxy - Tyx * conjTyy).real());
    result[7]  = static_cast<OutputValueType>((Txx * conjTxy - Tyx * conjTyy).imag());
    result[8]  = static_cast<OutputValueType>((Txx * conjTyx + Txy * conjTyy).real());
    result[9]  = static_cast<OutputValueType>((Txx * conjTyx - Txy * conjTyy).real());
    result[10] = static_cast<OutputValueType>((Txx * conjTyy + Txy * conjTyx).real());
    result[11] = static_cast<OutputValueType>((Txx * conjTyy - Txy * conjTyx).imag());
    result[12] = static_cast<OutputValueType>((conjTxx * Tyx + conjTxy * Tyy).imag());
    result[13] = static_cast<OutputValueType>((conjTxx * Tyx - conjTxy * Tyy).imag());
    result[14] = static_cast<OutputValueType>((conjTxx * Tyy + conjTxy * Tyx).imag());
    result[15] = static_cast<OutputValueType>((Txx * conjTyy - Txy * conjTyx).real());
  }
 
  constexpr size_t OutputSize(...) const
  {
    // Size of mueller matrix
    return 16;
  }
 
  SinclairToMuellerMatrixFunctor()
  {
  }
 
  virtual ~SinclairToMuellerMatrixFunctor()
  {
  }
};
 
} // namespace Functor
 
template <typename TInputImage, typename TOutputImage>
using SinclairToMuellerMatrixImageFilter = FunctorImageFilter<
    Functor::SinclairToMuellerMatrixFunctor<typename TInputImage::PixelType, typename TInputImage::PixelType, typename TInputImage::PixelType,
                                            typename TInputImage::PixelType, typename TOutputImage::PixelType>,
    std::tuple<polarimetry_tags::hh, polarimetry_tags::hv, polarimetry_tags::vh, polarimetry_tags::vv>>;
 
} // namespace otb
 
#endif