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dual_neighb.cc
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25 
26 #include <mln/make/dual_neighb.hh>
27 #include <mln/core/alias/neighb2d.hh>
28 #include <mln/core/image/image2d.hh>
29 #include <mln/opt/at.hh>
30 
31 
32 
33 template <typename I, typename N>
34 unsigned count(const I& ima, const N& nbh)
35 {
36  mln_piter(I) p(ima.domain());
37  mln_niter(N) n(nbh, p);
38  unsigned c = 0;
39  for_all(p)
40  for_all(n)
41  ++c;
42  return c;
43 }
44 
45 
46 int main()
47 {
48  using namespace mln;
49 
50  image2d<bool> ima(1, 2, 1);
51  opt::at(ima, 0, 0) = true;
52  opt::at(ima, 0, 1) = false;
53 
54  mln_assertion( count(ima, make::dual_neighb(ima, c4(), c8()))
55  == c4().size() + c8().size() );
56 
57  mln_assertion( make::dual_neighb(ima, c4(), c8()).foreground() == c4() );
58  mln_assertion( make::dual_neighb(ima, c4(), c8()).background() == c8() );
59 
60  // We can observe that the neighboord is not restricted by the
61  // respective domains defined by ima(p) == false and ima(p) == true:
62  // for instance, at (0,0) we are in the *object* (ima(0,0) == true),
63  // thus the neighborhood is c4(), yet from p we browse neighbors n
64  // that are in the *background* (ima(n) == false).
65 }