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visit_border.hxx |

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3 /* Copyright 2013-2014 by Martin Bidlingmaier and Ullrich Koethe */
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35
36 #ifndef VIGRA_VISIT_BORDER_HXX
37 #define VIGRA_VISIT_BORDER_HXX
38
39 #include "multi_array.hxx"
40
41 namespace vigra
42 {
43
44 namespace visit_border_detail
45 {
46
47 template <unsigned int K>
48 struct visit_border_impl
49 {
50 template <unsigned int N, class Data, class S1,
51 class Label, class S2,
52 class Shape, class Visitor>
53 static void exec(const MultiArrayView<N, Data, S1>& u_data, MultiArrayView<N, Label, S2> u_labels,
54 const MultiArrayView<N, Data, S1>& v_data, MultiArrayView<N, Label, S2> v_labels,
55 const Shape& block_difference, NeighborhoodType neighborhood, Visitor visitor)
56 {
57 static const unsigned int D = K - 1;
58 typedef visit_border_impl<D> next;
59
60 if(block_difference[D] == -1)
61 {
62 MultiArrayIndex last = v_data.shape(D) - 1;
63 next::exec(u_data.bindAt(D, 0), u_labels.bindAt(D, 0),
64 v_data.bindAt(D, last), v_labels.bindAt(D, last),
65 block_difference, neighborhood, visitor);
66 }
67 else if(block_difference[D] == 1)
68 {
69 MultiArrayIndex last = u_data.shape(D) - 1;
70 next::exec(u_data.bindAt(D, last), u_labels.bindAt(D, last),
71 v_data.bindAt(D, 0), v_labels.bindAt(D, 0),
72 block_difference, neighborhood, visitor);
73 }
74 else if(block_difference[D] == 0)
75 {
76 next::exec(u_data, u_labels, v_data, v_labels, block_difference, neighborhood, visitor);
77 }
78 else
79 {
80 vigra_precondition(false, "invalid block difference");
81 }
82 }
83 };
84
85 template <>
86 struct visit_border_impl<0>
87 {
88 template <class Data, class S1,
89 class Label, class S2,
90 class Shape, class Visitor>
91 static void exec(const MultiArrayView<0, Data, S1>& u_data, MultiArrayView<0, Label, S2> u_labels,
92 const MultiArrayView<0, Data, S1>& v_data, MultiArrayView<0, Label, S2> v_labels,
93 const Shape& block_difference, NeighborhoodType, Visitor visitor)
94 {
95 visitor(u_data(0), u_labels(0), v_data(0), v_labels(0), block_difference);
96 }
97 template <unsigned int N, class Data, class S1,
98 class Label, class S2,
99 class Shape, class Visitor>
100 static void exec(const MultiArrayView<N, Data, S1>& u_data, MultiArrayView<N, Label, S2> u_labels,
101 const MultiArrayView<N, Data, S1>& v_data, MultiArrayView<N, Label, S2> v_labels,
102 const Shape& block_difference, NeighborhoodType neighborhood, Visitor visitor)
103 {
104 if(neighborhood == DirectNeighborhood)
105 {
106 typedef typename MultiArrayView<N, Data, S1>::const_iterator DataIterator;
107 typedef typename MultiArrayView<N, Label, S2>::iterator LabelsIterator;
108
109 DataIterator u_data_it = u_data.begin();
110 LabelsIterator u_labels_it = u_labels.begin();
111
112 DataIterator v_data_it = v_data.begin();
113 LabelsIterator v_labels_it = v_labels.begin();
114
115 for( ; u_data_it != u_data.end(); ++u_data_it, ++u_labels_it, ++v_data_it, ++v_labels_it)
116 {
117 visitor(*u_data_it, *u_labels_it, *v_data_it, *v_labels_it, block_difference);
118 }
119 }
120 else if(neighborhood == IndirectNeighborhood)
121 {
122 typedef GridGraph<N, undirected_tag> Graph;
123 typedef typename Graph::NodeIt GraphScanner;
124 typedef typename Graph::OutArcIt NeighborIterator;
125
126 static const int global_dim_number = Shape::static_size;
127 TinyVector<unsigned int, N> dim_mapping; // mapping of every local dimension to their actual global dimension indices
128 int local_dims_pos = 0;
129 int global_dims_pos = 0;
130 for( ; global_dims_pos != global_dim_number; ++global_dims_pos)
131 {
132 if(block_difference[global_dims_pos] == 0)
133 {
134 vigra_assert(local_dims_pos != N, "");
135 dim_mapping[local_dims_pos] = global_dims_pos;
136 ++local_dims_pos;
137 }
138 }
139 vigra_assert(local_dims_pos == N, "");
140
141 Graph graph(u_data.shape(), neighborhood);
142 Shape pixel_difference = block_difference;
143 for(GraphScanner node(graph); node != lemon::INVALID; ++node)
144 {
145 // compare neighbors that have have equal coordinates in all unbound dimensions
146 // their pixel-level difference is exactly block_difference
147 visitor(u_data[*node], u_labels[*node], v_data[*node], v_labels[*node], block_difference);
148 // now let unbound dimensions vary
149 for(NeighborIterator arc(graph, *node); arc != lemon::INVALID; ++arc)
150 {
151 for(int i = 0; i != N; ++i)
152 pixel_difference[dim_mapping[i]] = graph.target(*arc)[i] - (*node)[i];
153 visitor(u_data[*node], u_labels[*node], v_data[graph.target(*arc)], v_labels[graph.target(*arc)], pixel_difference);
154 }
155 }
156 }
157 }
158 };
159
160 } // namespace visit_border_detail
161
162 template <unsigned int N, class Data, class S1,
163 class Label, class S2,
164 class Shape, class Visitor>
165 inline void
166 visitBorder(const MultiArrayView<N, Data, S1>& u_data, MultiArrayView<N, Label, S2> u_labels,
167 const MultiArrayView<N, Data, S1>& v_data, MultiArrayView<N, Label, S2> v_labels,
168 const Shape& difference, NeighborhoodType neighborhood, Visitor visitor)
169 {
170 vigra_precondition(u_data.shape() == u_labels.shape() && v_data.shape() == v_labels.shape(),
171 "differing block shapes");
172 visit_border_detail::visit_border_impl<N>::exec(u_data, u_labels,
173 v_data, v_labels,
174 difference, neighborhood, visitor);
175 }
176
177 } // namespace vigra
178
179 #endif // VIGRA_VISIT_BORDER_HXX
vigra::MultiArrayIndex
std::ptrdiff_t MultiArrayIndex
Definition: multi_fwd.hxx:60
vigra::IndirectNeighborhood
use direct and indirect neighbors
Definition: multi_fwd.hxx:188
vigra::DirectNeighborhood
use only direct neighbors
Definition: multi_fwd.hxx:187
vigra::NeighborhoodType
NeighborhoodType
Choose the neighborhood system in a dimension-independent way.
Definition: multi_fwd.hxx:186

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.11.0 (Fri May 19 2017)