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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 itkRegularizedHeavisideStepFunction_h
#define itkRegularizedHeavisideStepFunction_h
#include "itkHeavisideStepFunctionBase.h"
namespace itk
{
/** \class RegularizedHeavisideStepFunction
*
* \brief Base class of the Regularized (smoothed) Heaviside functions.
*
* \author Mosaliganti K., Smith B., Gelas A., Gouaillard A., Megason S.
*
* This code was taken from the Insight Journal paper:
*
* "Cell Tracking using Coupled Active Surfaces for Nuclei and Membranes"
* https://www.insight-journal.org/browse/publication/642
*
* That is based on the papers:
*
* "Level Set Segmentation: Active Contours without edge"
* https://www.insight-journal.org/browse/publication/322
*
* and
*
* "Level set segmentation using coupled active surfaces"
* https://www.insight-journal.org/browse/publication/323
*
*
* \ingroup ITKCommon
*/
template <typename TInput = float, typename TOutput = double>
class ITK_TEMPLATE_EXPORT RegularizedHeavisideStepFunction : public HeavisideStepFunctionBase<TInput, TOutput>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(RegularizedHeavisideStepFunction);
using Self = RegularizedHeavisideStepFunction;
using Superclass = HeavisideStepFunctionBase<TInput, TOutput>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using typename Superclass::InputType;
using typename Superclass::OutputType;
using RealType = typename NumericTraits<InputType>::RealType;
void
SetEpsilon(const RealType & ieps);
itkGetConstMacro(Epsilon, RealType);
itkGetConstMacro(OneOverEpsilon, RealType);
protected:
RegularizedHeavisideStepFunction() = default;
~RegularizedHeavisideStepFunction() override = default;
private:
RealType m_Epsilon{ NumericTraits<RealType>::OneValue() };
RealType m_OneOverEpsilon{ NumericTraits<RealType>::OneValue() };
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkRegularizedHeavisideStepFunction.hxx"
#endif
#endif
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