otbHistogramStatisticsFunction.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 otbHistogramStatisticsFunction_h
#define otbHistogramStatisticsFunction_h
 
#include "itkNumericTraits.h"
#include "itkHistogramAlgorithmBase.h"
 
namespace otb
{
 
template <class TInputHistogram, class TOutput>
class HistogramStatisticsFunction : public itk::HistogramAlgorithmBase<TInputHistogram>
{
public:
  typedef HistogramStatisticsFunction                  Self;
  typedef itk::HistogramAlgorithmBase<TInputHistogram> Superclass;
  typedef itk::SmartPointer<Self>                      Pointer;
  typedef itk::SmartPointer<const Self>                ConstPointer;
 
  typedef typename TInputHistogram::MeasurementType              MeasurementType;
  typedef typename TInputHistogram::AbsoluteFrequencyType        FrequencyType; // FIXME several possibilities in the new framework
  typedef typename itk::NumericTraits<MeasurementType>::RealType RealType;
 
  itkTypeMacro(HistogramStatisticsFunction, HistogramAlgorithmsBase);
  itkNewMacro(Self);
 
  typedef std::vector<TOutput> OutputType;
 
  OutputType GetEntropy();
 
  OutputType GetMean();
 
  OutputType GetCovariance();
 
  void SetInputHistogram(const TInputHistogram* histogram)
  {
    if (m_InputHistogram != histogram)
    {
      m_InputHistogram = histogram;
      this->Modified();
      m_IsModified = true;
    }
  }
 
  void Compute() override
  {
    this->GenerateData();
  }
 
protected:
  HistogramStatisticsFunction();
  ~HistogramStatisticsFunction() override
  {
  }
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;
 
  void GenerateData();
 
  void CalculateEntropy();
 
  void CalculateMean();
 
  void CalculateCovariance();
 
 
private:
  OutputType m_entropy;
  OutputType m_mean;
  OutputType m_covariance;
  bool       m_IsModified;
 
  typename TInputHistogram::ConstPointer m_InputHistogram;
 
}; // end of class
 
} // end of namespace otb
 
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbHistogramStatisticsFunction.hxx"
#endif
 
#endif