otbImageToRadianceImageFilter.h

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/*
 * Copyright (C) 1999-2011 Insight Software Consortium
 * 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 otbImageToRadianceImageFilter_h
#define otbImageToRadianceImageFilter_h
 
#include "otbUnaryImageFunctorWithVectorImageFilter.h"
#include "itkNumericTraits.h"
#include "otbMacro.h"
 
 
namespace otb
{
namespace Functor
{
template <class TInput, class TOutput>
class ImageToRadianceImageFunctor
{
public:
  ImageToRadianceImageFunctor() : m_Alpha(1.), m_Beta(0.)
  {
  }
 
  virtual ~ImageToRadianceImageFunctor()
  {
  }
 
  void SetAlpha(double alpha)
  {
    m_Alpha = alpha;
  }
  void SetBeta(double beta)
  {
    m_Beta = beta;
  }
  double GetAlpha()
  {
    return m_Alpha;
  }
  double GetBeta()
  {
    return m_Beta;
  }
 
  inline TOutput operator()(const TInput& inPixel) const
  {
    TOutput outPixel;
    double  temp;
    temp     = static_cast<double>(inPixel) / m_Alpha + m_Beta;
    outPixel = static_cast<TOutput>(temp);
    return outPixel;
  }
 
private:
  double m_Alpha;
  double m_Beta;
};
}
 
template <class TInputImage, class TOutputImage>
class ITK_EXPORT ImageToRadianceImageFilter
    : public UnaryImageFunctorWithVectorImageFilter<
          TInputImage, TOutputImage,
          typename Functor::ImageToRadianceImageFunctor<typename TInputImage::InternalPixelType, typename TOutputImage::InternalPixelType>>
{
public:
  itkStaticConstMacro(InputImageDimension, unsigned int, TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int, TOutputImage::ImageDimension);
 
  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
  typedef typename Functor::ImageToRadianceImageFunctor<typename InputImageType::InternalPixelType, typename OutputImageType::InternalPixelType> FunctorType;
 
  typedef ImageToRadianceImageFilter Self;
  typedef UnaryImageFunctorWithVectorImageFilter<InputImageType, OutputImageType, FunctorType> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ImageToRadianceImageFilter, UnaryImageFunctorWithVectorImageFiltermageFilter);
 
  typedef typename InputImageType::PixelType          InputPixelType;
  typedef typename InputImageType::InternalPixelType  InputInternalPixelType;
  typedef typename InputImageType::RegionType         InputImageRegionType;
  typedef typename OutputImageType::PixelType         OutputPixelType;
  typedef typename OutputImageType::InternalPixelType OutputInternalPixelType;
  typedef typename OutputImageType::RegionType        OutputImageRegionType;
 
  typedef typename itk::VariableLengthVector<double> VectorType;
 
  typedef typename InputImageType::SizeType SizeType;
 
  itkSetMacro(Alpha, VectorType);
 
  itkGetConstReferenceMacro(Alpha, VectorType);
 
  itkSetMacro(Beta, VectorType);
 
  itkGetConstReferenceMacro(Beta, VectorType);
 
protected:
  ImageToRadianceImageFilter()
  {
    m_Alpha.SetSize(0);
    m_Beta.SetSize(0);
  };
 
  ~ImageToRadianceImageFilter() override
  {
  }
 
  void BeforeThreadedGenerateData(void) override
  {
    const auto & metadata = this->GetInput()->GetImageMetadata();
 
    if (m_Alpha.GetSize() == 0 && metadata.HasBandMetadata(MDNum::PhysicalGain))
    {
      m_Alpha = metadata.GetAsVector(MDNum::PhysicalGain);
    }
 
    if (m_Beta.GetSize() == 0 && metadata.HasBandMetadata(MDNum::PhysicalBias))
    {
      m_Beta = metadata.GetAsVector(MDNum::PhysicalBias);
    }
 
    otbMsgDevMacro(<< "Dimension: ");
    otbMsgDevMacro(<< "m_Alpha.GetSize(): " << m_Alpha.GetSize());
    otbMsgDevMacro(<< "m_Beta.GetSize() : " << m_Beta.GetSize());
    otbMsgDevMacro(<< "this->GetInput()->GetNumberOfComponentsPerPixel() : " << this->GetInput()->GetNumberOfComponentsPerPixel());
 
    if ((m_Alpha.GetSize() != this->GetInput()->GetNumberOfComponentsPerPixel()) || (m_Beta.GetSize() != this->GetInput()->GetNumberOfComponentsPerPixel()))
    {
      itkExceptionMacro(<< "Alpha and Beta parameters should have the same size as the number of bands");
    }
 
    otbMsgDevMacro(<< "Using correction parameters: ");
    otbMsgDevMacro(<< "Alpha (gain): " << m_Alpha);
    otbMsgDevMacro(<< "Beta (bias):  " << m_Beta);
 
    this->GetFunctorVector().clear();
    for (unsigned int i = 0; i < this->GetInput()->GetNumberOfComponentsPerPixel(); ++i)
    {
      FunctorType functor;
      functor.SetAlpha(m_Alpha[i]);
      functor.SetBeta(m_Beta[i]);
      this->GetFunctorVector().push_back(functor);
    }
  }
 
private:
  VectorType m_Alpha;
  VectorType m_Beta;
};
 
} // end namespace otb
 
#endif