ITK  4.3.0
Insight Segmentation and Registration Toolkit
itkHistogramToLogProbabilityImageFilter.h
Go to the documentation of this file.
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 __itkHistogramToLogProbabilityImageFilter_h
19 #define __itkHistogramToLogProbabilityImageFilter_h
20 
22 
23 namespace itk
24 {
47 namespace Function
48 {
49 template< class TInput, class TOutput = double >
51 {
52 public:
53 
54  //Probability function = Number of occurrences in each bin /
55  // Total Number of occurrences.
56  //
57  // Returns pixels of float..
58  typedef TOutput OutputPixelType;
59 
61  m_TotalFrequency(1) {}
62 
64 
65  inline OutputPixelType operator()(const TInput & A) const
66  {
67  if ( A )
68  {
69  return static_cast< OutputPixelType >( vcl_log( static_cast< OutputPixelType >( A )
70  / static_cast< OutputPixelType >( m_TotalFrequency ) )
71  / vcl_log(2.0) );
72  }
73  else
74  { // Check for Log 0. Always assume that the frequency is atleast 1.
75  return static_cast< OutputPixelType >( vcl_log( static_cast< OutputPixelType >( A + 1 )
76  / static_cast< OutputPixelType >( m_TotalFrequency ) )
77  / vcl_log(2.0) );
78  }
79  }
80 
82  {
83  m_TotalFrequency = n;
84  }
85 
87  {
88  return m_TotalFrequency;
89  }
90 
91 private:
93 };
94 }
95 
96 template< class THistogram, class TImage=Image< double, 3 > >
98  public HistogramToImageFilter< THistogram, TImage,
99  Function::HistogramLogProbabilityFunction< SizeValueType, typename TImage::PixelType > >
100 {
101 public:
102 
105 
107  typedef HistogramToImageFilter< THistogram, TImage,
110 
113 
116 
118  itkNewMacro(Self);
119 
120 protected:
123 
124 private:
125  HistogramToLogProbabilityImageFilter(const Self &); //purposely not
126  // implemented
127  void operator=(const Self &); //purposely not
128  // implemented
129 };
130 } // end namespace itk
131 
132 #endif
133