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/*
* Copyright (C) 2005-2020 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
{
/** \class HistogramStatisticsFunction
* \brief Computes parameters for a histogram.
*
* You plug in the target histogram using SetInputHistogram method and
* get the entropy value from the histogram by calling the method GetEntropy
* or the GenerateData method.
*
* \ingroup Function
*
* \ingroup OTBStatistics
*/
template <class TInputHistogram, class TOutput>
class HistogramStatisticsFunction : public itk::HistogramAlgorithmBase<TInputHistogram>
{
public:
/**Standard class typedefs. */
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;
/**Standard Macros */
itkTypeMacro(HistogramStatisticsFunction, HistogramAlgorithmsBase);
itkNewMacro(Self);
/** Typedef for the output type */
typedef std::vector<TOutput> OutputType;
/** Returns the entropy value */
OutputType GetEntropy();
/** Returns the mean value from histogram*/
OutputType GetMean();
/** Returns the covariance value from histogram*/
OutputType GetCovariance();
/** Stores the histogram pointer */
void SetInputHistogram(const TInputHistogram* histogram)
{
if (m_InputHistogram != histogram)
{
m_InputHistogram = histogram;
this->Modified();
m_IsModified = true;
}
}
/** Calculates the thresholds and save them */
void Compute() override
{
this->GenerateData();
}
protected:
HistogramStatisticsFunction();
~HistogramStatisticsFunction() override
{
}
void PrintSelf(std::ostream& os, itk::Indent indent) const override;
/** Calculates the thresholds and save them */
void GenerateData();
/** Calculate the entropy value */
void CalculateEntropy();
/** Calculate mean value */
void CalculateMean();
/** Calculate covariance value */
void CalculateCovariance();
private:
OutputType m_entropy;
OutputType m_mean;
OutputType m_covariance;
bool m_IsModified;
/** Target histogram data pointer */
typename TInputHistogram::ConstPointer m_InputHistogram;
}; // end of class
} // end of namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbHistogramStatisticsFunction.hxx"
#endif
#endif
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