otbUnConstrainedLeastSquareImageFilter.h

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/*
 * Copyright (C) 2005-2024 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 otbUnConstrainedLeastSquareImageFilter_h
#define otbUnConstrainedLeastSquareImageFilter_h
 
#include "itkMacro.h"
#include "otbFunctorImageFilter.h"
#include "vnl/algo/vnl_svd.h"
#include <memory>
 
namespace otb
{
 
namespace Functor
{
 
template <class TInput, class TOutput, class TPrecision>
class UnConstrainedLeastSquareFunctor
{
public:
  typedef TInput     InputType;
  typedef TOutput    OutputType;
  typedef TPrecision PrecisionType;
 
  typedef vnl_vector<PrecisionType> VectorType;
  typedef vnl_matrix<PrecisionType> MatrixType;
 
  UnConstrainedLeastSquareFunctor() : m_OutputSize(0){};
  virtual ~UnConstrainedLeastSquareFunctor() = default;
 
  size_t OutputSize(const std::array<size_t, 1>& nbBands) const;
 
  void SetMatrix(const MatrixType& m);
 
  OutputType operator()(const InputType& in) const;
 
private:
  typedef vnl_svd<PrecisionType>     SVDType;
  typedef std::shared_ptr<SVDType> SVDPointerType;
 
  unsigned int   m_OutputSize;
  SVDPointerType m_Svd;
  MatrixType     m_Inv;
};
}
 
template <typename TInputImage, typename TOutputImage, typename TPrecision>
using UnConstrainedLeastSquareImageFilter =
    FunctorImageFilter<Functor::UnConstrainedLeastSquareFunctor<typename TInputImage::PixelType, typename TOutputImage::PixelType, TPrecision>>;
 
} // end namespace otb
 
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbUnConstrainedLeastSquareImageFilter.hxx"
#endif
 
#endif