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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 otbHuPathFunction_h
#define otbHuPathFunction_h
#include "otbRealMomentPathFunction.h"
namespace otb
{
/**
* \class HuPathFunction
* \brief Calculate the Hu's invariant parameter.
*
* Calculate the Hu's invariant defined as:
*
* - \f$ \phi_{1} = c_{11} \f$
* - \f$ \phi_{2} = c_{20} c_{02} \f$
* - \f$ \phi_{3} = c_{30} c_{03} \f$
* - \f$ \phi_{4} = c_{21} c_{12} \f$
* - \f$ \phi_{5} = Re (c_{30} c_{12}^{3}) \f$
* - \f$ \phi_{6} = Re (c_{20} c_{12}^{2}) \f$
* - \f$ \phi_{7} = Im (c_{30} c_{12}^{3}) \f$
*
* With :
*
* \f[ c_{p, q}=\int \int (x+iy)^{p} \cdot (x-iy)^{q} \cdot f(x, y) \cdot
dx \cdot dy \f]
*
* And:
* - \f$(x, y)\f$ pixel localization;
* - \f$ f(x, y)\f$ the pixel value over the \f$(x, y)\f$ coordinate.
*
* This class is templated over the input image type and the
* path type (e.g. PolyLineParametricPath<2> ).
*
* \ingroup FunctionFunctions
*
* \ingroup OTBMoments
*/
template <class TInputPath, class TOutput = double, class TPrecision = double>
class ITK_EXPORT HuPathFunction : public RealMomentPathFunction<TInputPath, TOutput, TPrecision>
{
public:
/** Standard class typedefs. */
typedef HuPathFunction Self;
typedef RealMomentPathFunction<TInputPath, TOutput, TPrecision> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(HuPathFunction, RealMomentPathFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** InputPathType typedef support. */
typedef typename Superclass::PathType PathType;
typedef typename Superclass::PathConstPointer PathConstPointer;
typedef typename PathType::ContinuousIndexType VertexType;
typedef itk::VectorContainer<unsigned, VertexType> VertexListType;
typedef typename VertexListType::ConstPointer VertexListPointer;
/** OutputType typedef support. */
typedef typename Superclass::RealType RealType;
/** Type for calculation precision */
typedef typename Superclass::PrecisionType PrecisionType;
/** Evaluate the function at non-integer positions */
RealType Evaluate(const PathType& path) const override;
virtual RealType Evaluate() const;
/** Get/Set the radius of the neighborhood over which the
statistics are evaluated */
itkSetMacro(MomentNumber, short);
itkGetConstReferenceMacro(MomentNumber, short);
protected:
HuPathFunction();
~HuPathFunction() override
{
}
void PrintSelf(std::ostream& os, itk::Indent indent) const override;
private:
HuPathFunction(const Self&) = delete;
void operator=(const Self&) = delete;
short m_MomentNumber;
};
} // namespace otb
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbHuPathFunction.hxx"
#endif
#endif
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