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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 otbLog10ThresholdedImageFilter_h
#define otbLog10ThresholdedImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "vnl/vnl_math.h"
namespace otb
{
/** \class Log10ThresholdedImageFilter
* \brief Computes the 10 * std::log10(x) pixel-wise with a threshold for the lowest values
*
* \ingroup OTBImageManipulation
*/
namespace Functor
{
template <class TInput, class TOutput>
class Log10Thresholded
{
public:
Log10Thresholded()
{
m_ThresholdValue = 0.001; // -> -30dB
}
~Log10Thresholded()
{
}
bool operator!=(const Log10Thresholded&) const
{
return false;
}
bool operator==(const Log10Thresholded& other) const
{
return !(*this != other);
}
inline TOutput operator()(const TInput& A) const
{
if ((static_cast<double>(A) >= m_ThresholdValue) && (A == A))
{
return static_cast<TOutput>(10.0 * std::log10(static_cast<double>(A)));
}
else // If (A != A) then A is a NaN
{
return static_cast<TOutput>(10.0 * std::log10(m_ThresholdValue));
}
}
/** Set ThresholdValue method */
void SetThresholdValue(const double value)
{
if (value > 0.0)
{
m_ThresholdValue = value;
}
}
private:
double m_ThresholdValue;
};
} // End namespace Functor
template <class TInputImage, class TOutputImage>
class ITK_EXPORT Log10ThresholdedImageFilter
: public itk::UnaryFunctorImageFilter<TInputImage, TOutputImage,
Functor::Log10Thresholded<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
/** Standard class typedefs. */
typedef Log10ThresholdedImageFilter Self;
typedef Functor::Log10Thresholded<typename TInputImage::PixelType, typename TOutputImage::PixelType> FunctorType;
typedef itk::UnaryFunctorImageFilter<TInputImage, TOutputImage, FunctorType> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(Log10ThresholdedImageFilter, itk::UnaryFunctorImageFilter);
void SetThresholdedValue(double val)
{
this->GetFunctor().SetThresholdValue(val);
}
protected:
Log10ThresholdedImageFilter()
{
}
~Log10ThresholdedImageFilter() override
{
}
private:
Log10ThresholdedImageFilter(const Self&) = delete;
void operator=(const Self&) = delete;
};
} // end namespace otb
#endif
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