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impexbase.hxx VIGRA

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3 /* Copyright 2012 Christoph Spiel */
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35 
36 #ifndef VIGRA_IMPEXBASE_HXX
37 #define VIGRA_IMPEXBASE_HXX
38 
39 
40 #include <string>
41 #include "inspectimage.hxx"
42 #include "sized_int.hxx"
43 #include "utilities.hxx"
44 
45 
46 namespace vigra
47 {
48  typedef enum
49  {
50  UNSIGNED_INT_8,
51  UNSIGNED_INT_16,
52  UNSIGNED_INT_32,
53  SIGNED_INT_16,
54  SIGNED_INT_32,
55  IEEE_FLOAT_32,
56  IEEE_FLOAT_64
57  } pixel_t;
58 
59 
60  namespace detail
61  {
62  inline static pixel_t
63  pixel_t_of_string(const std::string& pixel_type)
64  {
65  if (pixel_type == "BILEVEL")
66  {
67  return UNSIGNED_INT_8;
68  }
69  else if (pixel_type == "UINT8")
70  {
71  return UNSIGNED_INT_8;
72  }
73  else if (pixel_type == "UINT16")
74  {
75  return UNSIGNED_INT_16;
76  }
77  else if (pixel_type == "UINT32")
78  {
79  return UNSIGNED_INT_32;
80  }
81  else if (pixel_type == "INT16")
82  {
83  return SIGNED_INT_16;
84  }
85  else if (pixel_type == "INT32")
86  {
87  return SIGNED_INT_32;
88  }
89  else if (pixel_type == "FLOAT")
90  {
91  return IEEE_FLOAT_32;
92  }
93  else if (pixel_type == "DOUBLE")
94  {
95  return IEEE_FLOAT_64;
96  }
97  else
98  {
99  vigra_fail("vigra_ext::detail::pixel_t_of_string: unknown pixel type");
100  return UNSIGNED_INT_8; // NOT REACHED
101  }
102  }
103 
104 
105  struct identity
106  {
107  template <typename T>
108  T operator()(T x) const
109  {
110  return x;
111  }
112  };
113 
114 
115  typedef pair<double, double> range_t;
116 
117 
118  class linear_transform
119  {
120  public:
121  linear_transform(const range_t& source, const range_t& destination) :
122  scale_((destination.second - destination.first) / (source.second - source.first)),
123  offset_(destination.first / scale_ - source.first)
124  {}
125 
126  template <typename T>
127  double operator()(T x) const
128  {
129  return scale_ * (static_cast<double>(x) + offset_);
130  }
131 
132  private:
133  const double scale_;
134  const double offset_;
135  };
136 
137 
138  template <class Iterator, class Accessor>
139  inline static range_t
140  find_value_range(Iterator upper_left, Iterator lower_right, Accessor accessor,
141  /* is_scalar? */ VigraTrueType)
142  {
143  typedef typename Accessor::value_type value_type;
144 
145  FindMinMax<value_type> extrema;
146 
147  inspectImage(upper_left, lower_right, accessor, extrema);
148 
149  return range_t(static_cast<double>(extrema.min), static_cast<double>(extrema.max));
150  }
151 
152 
153  template <class Iterator, class Accessor>
154  inline static range_t
155  find_value_range(Iterator upper_left, Iterator lower_right, Accessor accessor,
156  /* is_scalar? */ VigraFalseType)
157  {
158  typedef typename Accessor::ElementAccessor element_accessor;
159  typedef typename element_accessor::value_type value_type;
160 
161  const int number_of_bands(static_cast<int>(accessor.size(upper_left)));
162  FindMinMax<value_type> extrema;
163 
164  for (int i = 0; i != number_of_bands; ++i)
165  {
166  element_accessor band(i, accessor);
167 
168  inspectImage(upper_left, lower_right, band, extrema);
169  }
170 
171  return range_t(static_cast<double>(extrema.min), static_cast<double>(extrema.max));
172  }
173 
174 
175  template <class SourceIterator, class SourceAccessor>
176  inline static range_t
177  find_source_value_range(const ImageExportInfo& export_info,
178  SourceIterator upper_left, SourceIterator lower_right, SourceAccessor accessor)
179  {
180  if (export_info.getFromMin() < export_info.getFromMax())
181  {
182  return range_t(export_info.getFromMin(), export_info.getFromMax());
183  }
184  else
185  {
186  typedef typename SourceAccessor::value_type SourceValueType;
187  typedef typename NumericTraits<SourceValueType>::isScalar is_scalar;
188 
189  const range_t range(find_value_range(upper_left, lower_right, accessor, is_scalar()));
190 
191  if (range.first < range.second)
192  {
193  return range_t(range.first, range.second);
194  }
195  else
196  {
197  return range_t(range.first, range.first + 1.0);
198  }
199  }
200  }
201 
202 
203  template <typename T>
204  inline static range_t
205  find_destination_value_range(const ImageExportInfo& export_info)
206  {
207  if (export_info.getToMin() < export_info.getToMax())
208  {
209  return range_t(export_info.getToMin(), export_info.getToMax());
210  }
211  else
212  {
213  return range_t(static_cast<double>(NumericTraits<T>::min()),
214  static_cast<double>(NumericTraits<T>::max()));
215  }
216  }
217 
218 
219  inline static range_t
220  find_destination_value_range(const ImageExportInfo& export_info, pixel_t pixel_type)
221  {
222  switch (pixel_type)
223  {
224  case UNSIGNED_INT_8: return find_destination_value_range<UInt8>(export_info);
225  case UNSIGNED_INT_16: return find_destination_value_range<UInt16>(export_info);
226  case UNSIGNED_INT_32: return find_destination_value_range<UInt32>(export_info);
227  case SIGNED_INT_16: return find_destination_value_range<Int16>(export_info);
228  case SIGNED_INT_32: return find_destination_value_range<Int32>(export_info);
229  case IEEE_FLOAT_32: return find_destination_value_range<float>(export_info);
230  case IEEE_FLOAT_64: return find_destination_value_range<double>(export_info);
231  default:
232  vigra_fail("vigra_ext::detail::find_destination_value_range: not reached");
233  return range_t(0.0, 0.0); // NOT REACHED
234  }
235  }
236  } // end namespace detail
237 } // end namespace vigra
238 
239 
240 #endif // VIGRA_IMPEXBASE_HXX
vigra::boost_graph::source
vigra::GridGraph< N, DirectedTag >::vertex_descriptor source(typename vigra::GridGraph< N, DirectedTag >::edge_descriptor const &e, vigra::GridGraph< N, DirectedTag > const &g)
Get a vertex descriptor for the start vertex of edge e in graph g (API: boost).
Definition: multi_gridgraph.hxx:2943
vigra::inspectImage
void inspectImage(...)
Apply read-only functor to every pixel in the image.

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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vigra 1.11.1 (Fri May 19 2017)