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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* 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 itkNoiseBaseImageFilter_h
#define itkNoiseBaseImageFilter_h
#include "itkInPlaceImageFilter.h"
#include <ctime>
namespace itk
{
/**
* \class NoiseBaseImageFilter
*
* \brief An Abstract Base class for Noise image filters
*
* This class add common methods for setting a seed for the random
* generators used to generate the noise.
*
* \sa InPlaceImageFilter
* \ingroup ITKImageNoise
*/
template <class TInputImage, class TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT NoiseBaseImageFilter : public InPlaceImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(NoiseBaseImageFilter);
/** Standard class type aliases. */
using Self = NoiseBaseImageFilter;
using Superclass = InPlaceImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using typename Superclass::OutputImagePixelType;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(NoiseBaseImageFilter);
/** Set/Get the seed for random initialization */
itkGetConstMacro(Seed, uint32_t);
itkSetMacro(Seed, uint32_t);
/** Set the seed to a value initialized with the current time and
* process clock. */
virtual void
SetSeed();
protected:
NoiseBaseImageFilter();
~NoiseBaseImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
inline static uint32_t
Hash(uint32_t a, uint32_t b)
{
// Knuth's Multiplicative Method for hashing
return (a + b) * 2654435761u;
}
// Clamp and round the input value to the output
static OutputImagePixelType
ClampCast(const double value);
private:
uint32_t m_Seed{ 0 };
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkNoiseBaseImageFilter.hxx"
#endif
#endif
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