1 /*=========================================================================
2  *
3  *  Copyright Insight Software Consortium
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at
8  *
9  *         http://www.apache.org/licenses/LICENSE-2.0.txt
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  *=========================================================================*/
18 #ifndef itkSinRegularizedHeavisideStepFunction_h
19 #define itkSinRegularizedHeavisideStepFunction_h
20 
21 #include "itkRegularizedHeavisideStepFunction.h"
22 
23 namespace itk
24 {
25 /** \class SinRegularizedHeavisideStepFunction
26  *
27  * \brief Sin-based implementation of the Regularized (smoothed) Heaviside functions.
28  *
29  * \author Mosaliganti K., Smith B., Gelas A., Gouaillard A., Megason S.
30  *
31  *  This code was taken from the Insight Journal paper:
32  *
33  *      "Cell Tracking using Coupled Active Surfaces for Nuclei and Membranes"
34  *      http://www.insight-journal.org/browse/publication/642
35  *      https://hdl.handle.net/10380/3055
36  *
37  *  That is based on the papers:
38  *
39  *      "Level Set Segmentation: Active Contours without edge"
40  *      http://www.insight-journal.org/browse/publication/322
41  *      https://hdl.handle.net/1926/1532
42  *
43  *      and
44  *
45  *      "Level set segmentation using coupled active surfaces"
46  *      http://www.insight-journal.org/browse/publication/323
47  *      https://hdl.handle.net/1926/1533
48  *
49  *
50  * \ingroup ITKCommon
51  */
52 template< typename TInput = float, typename TOutput = double >
53 class ITK_TEMPLATE_EXPORT SinRegularizedHeavisideStepFunction:
54   public RegularizedHeavisideStepFunction< TInput, TOutput >
55 {
56 public:
57   ITK_DISALLOW_COPY_AND_ASSIGN(SinRegularizedHeavisideStepFunction);
58 
59   using Self = SinRegularizedHeavisideStepFunction;
60   using Superclass = RegularizedHeavisideStepFunction< TInput, TOutput >;
61   using Pointer = SmartPointer< Self >;
62   using ConstPointer = SmartPointer< const Self >;
63 
64   itkNewMacro(Self);
65 
66   itkTypeMacro(SinRegularizedHeavisideStepFunction, RegularizedHeavisideStepFunction);
67 
68   using InputType = typename Superclass::InputType;
69   using OutputType = typename Superclass::OutputType;
70   using RealType = typename Superclass::RealType;
71 
72   /** Evaluate at the specified input position */
73   OutputType Evaluate(const InputType & input) const override;
74 
75   /** Evaluate the derivative at the specified input position */
76   OutputType EvaluateDerivative(const InputType & input) const override;
77 
78 protected:
79   SinRegularizedHeavisideStepFunction() = default;
80   ~SinRegularizedHeavisideStepFunction() override = default;
81 };
82 }
83 
84 #ifndef ITK_MANUAL_INSTANTIATION
85 #include "itkSinRegularizedHeavisideStepFunction.hxx"
86 #endif
87 
88 #endif
89