otbBinarySpectralAngleFunctor.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 otbBinarySpectralAngleFunctor_h
#define otbBinarySpectralAngleFunctor_h
 
#include <algorithm>
#include "otbMath.h"
#include "otbSpectralAngleFunctor.h"
 
namespace otb
{
namespace Functor
{
template <class TInput1, class TInput2, class TOutputValue>
class BinarySpectralAngleFunctor
{
public:
  BinarySpectralAngleFunctor() = default;
 
  virtual ~BinarySpectralAngleFunctor() = default;
 
  // Binary operator
  TOutputValue operator()(const TInput1& in1, const TInput2& in2) const
  {
    // Compute norms.
    auto in1Norm = 0;
    auto in2Norm = 0;
    auto nbIter = std::min(in1.Size(), in2.Size());
    for (unsigned int i = 0; i < nbIter; ++i)
    {
      in1Norm += in1[i] * in1[i];
      in2Norm += in2[i] * in2[i];
    }
    
    return SpectralAngleDetails::ComputeSpectralAngle<TInput1, TInput2, TOutputValue>(in1, in1Norm, in2, in2Norm);
  }
};
 
} // end namespace Functor
} // end namespace otb
 
#endif