otbComputeGainLutFilter.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 otbComputeGainLutFilter_h
#define otbComputeGainLutFilter_h
 
#include "itkImageToImageFilter.h"
#include "otbImage.h"
 
namespace otb
{
 
template <class TInputImage, class TOutputImage>
class ITK_EXPORT ComputeGainLutFilter : public itk::ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
 
  typedef ComputeGainLutFilter Self;
  typedef itk::ImageToImageFilter<InputImageType, OutputImageType> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  typedef typename InputImageType::PixelType          HistoType;
  typedef typename OutputImageType::PixelType         LutType;
  typedef typename OutputImageType::InternalPixelType OutputPixelType;
  typedef typename OutputImageType::RegionType        OutputImageRegionType;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ComputeGainLutFilter, ImageToImageFilter);
 
  itkSetMacro(NbPixel, unsigned long);
  itkGetMacro(NbPixel, unsigned long);
 
  itkSetMacro(Min, double);
  itkGetMacro(Min, double);
 
  itkSetMacro(Max, double);
  itkGetMacro(Max, double);
 
protected:
  ComputeGainLutFilter();
  ~ComputeGainLutFilter() override
  {
  }
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;
 
  void BeforeThreadedGenerateData() override;
 
  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread, itk::ThreadIdType threadId) override;
 
private:
  ComputeGainLutFilter(const Self&) = delete;
  void operator=(const Self&) = delete;
 
  OutputPixelType PostProcess(unsigned int countMapValue, unsigned int countValue);
 
  void Equalized(const HistoType& inputHisto, HistoType& targetHisto, LutType& lut);
 
  void CreateTarget(const HistoType& inputHisto, HistoType& targetHisto);
  // TODO Give the opportunity to choose the histogram target
 
  bool IsValid(const HistoType& inputHisto);
 
  double        m_Min;
  double        m_Max;
  double        m_Step;
  unsigned int  m_NbBin;
  unsigned long m_NbPixel;
};
 
// End namespace otb
}
 
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbComputeGainLutFilter.hxx"
#endif
 
#endif