Orfeo Toolbox  4.2
itkHistogramToLogProbabilityImageFilter.h
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3  * Copyright Insight Software Consortium
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5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
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14  * See the License for the specific language governing permissions and
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17  *=========================================================================*/
18 #ifndef __itkHistogramToLogProbabilityImageFilter_h
19 #define __itkHistogramToLogProbabilityImageFilter_h
20 
22 
23 namespace itk
24 {
47 namespace Function
48 {
49 template< typename TInput, typename 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 >( std::log( static_cast< OutputPixelType >( A )
70  / static_cast< OutputPixelType >( m_TotalFrequency ) )
71  / std::log(2.0) );
72  }
73  else
74  { // Check for Log 0. Always assume that the frequency is atleast 1.
75  return static_cast< OutputPixelType >( std::log( static_cast< OutputPixelType >( A + 1 )
76  / static_cast< OutputPixelType >( m_TotalFrequency ) )
77  / std::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< typename THistogram, typename 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

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