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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 otbLocalHistogramImageFunction_h
#define otbLocalHistogramImageFunction_h
#include "itkImageFunction.h"
#include "itkHistogram.h"
#include "itkNumericTraits.h"
namespace otb
{
/**
* \class LocalHistogramImageFunction
* \brief Calculate a local histogram over a specified circular neighborhood
*
* This image function computes the local histogram of the pixels lying
* in a circular neighborhood around the given position.
*
* Pixel count can be optionally weighted by a gaussian kernel with
* \f$ \sigma = 0.5 radius \f$ so that pixel far from the center position
* account less in the histogram than pixel near the center position.
* This option can be deactivated using the GaussianSmoothing flag.
*
* Histogram mininimum value, maximum value and number of bins can be
* set using the Setters/Getters.
*
* This class is templated over the input image type and the
* coordinate representation type (e.g. float or double).
*
* \ingroup ImageFunctions
*
* \ingroup OTBStatistics
*/
template <class TInputImage, class TCoordRep = double>
class ITK_EXPORT LocalHistogramImageFunction
: public itk::ImageFunction<TInputImage, typename itk::Statistics::Histogram<typename TInputImage::PixelType>::Pointer, TCoordRep>
{
public:
/** Standard class typedefs. */
typedef LocalHistogramImageFunction Self;
typedef itk::ImageFunction<TInputImage, typename itk::Statistics::Histogram<typename TInputImage::PixelType>::Pointer, TCoordRep> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(LocalHistogramImageFunction, ImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** InputImageType typedef support. */
typedef TInputImage InputImageType;
typedef typename Superclass::IndexType IndexType;
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
typedef typename Superclass::PointType PointType;
typedef typename Superclass::OutputType OutputType;
typedef itk::Statistics::Histogram<typename TInputImage::PixelType> HistogramType;
typedef typename HistogramType::Pointer HistogramPointer;
typedef TCoordRep CoordRepType;
/** Dimension of the underlying image. */
itkStaticConstMacro(ImageDimension, unsigned int, InputImageType::ImageDimension);
/** Evalulate the function at specified index */
OutputType EvaluateAtIndex(const IndexType& index) const override;
/** Evaluate the function at non-integer positions */
OutputType Evaluate(const PointType& point) const override
{
IndexType index;
this->ConvertPointToNearestIndex(point, index);
return this->EvaluateAtIndex(index);
}
OutputType EvaluateAtContinuousIndex(const ContinuousIndexType& cindex) const override
{
IndexType index;
this->ConvertContinuousIndexToNearestIndex(cindex, index);
return this->EvaluateAtIndex(index);
}
/** Get/Set the radius of the neighborhood over which the
* statistics are evaluated
*/
itkSetMacro(NeighborhoodRadius, unsigned int);
itkGetConstReferenceMacro(NeighborhoodRadius, unsigned int);
/** Set/Get the number of histogram bins. Default is 128. */
itkSetClampMacro(NumberOfHistogramBins, unsigned long, 1, itk::NumericTraits<unsigned long>::max());
itkGetConstMacro(NumberOfHistogramBins, unsigned long);
itkSetMacro(HistogramMin, double);
itkGetConstReferenceMacro(HistogramMin, double);
itkSetMacro(HistogramMax, double);
itkGetConstReferenceMacro(HistogramMax, double);
itkSetMacro(GaussianSmoothing, bool);
itkGetConstReferenceMacro(GaussianSmoothing, bool);
itkBooleanMacro(GaussianSmoothing);
protected:
LocalHistogramImageFunction();
~LocalHistogramImageFunction() override
{
}
void PrintSelf(std::ostream& os, itk::Indent indent) const override;
private:
LocalHistogramImageFunction(const Self&) = delete;
void operator=(const Self&) = delete;
unsigned int m_NeighborhoodRadius;
unsigned long m_NumberOfHistogramBins;
double m_HistogramMin;
double m_HistogramMax;
bool m_GaussianSmoothing;
};
} // namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbLocalHistogramImageFunction.hxx"
#endif
#endif
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