[Olena-patches] last-svn-commit-271-g494c594 Fix, factor and improve the (exact) simple 3D point criterion.

* mln/topo/is_simple_point3d.hh (mln::topo::is_simple_point3d<I, N>::operator()): Honor the neighborhoods. Use the new routines to compute the connectivity numbers instead of computing them directly. --- milena/ChangeLog | 10 +++ milena/mln/topo/is_simple_point3d.hh | 125 +++++++--------------------------- 2 files changed, 35 insertions(+), 100 deletions(-) diff --git a/milena/ChangeLog b/milena/ChangeLog index 0ef0cf7..5de8e06 100644 --- a/milena/ChangeLog +++ b/milena/ChangeLog @@ -1,5 +1,15 @@ 2011-06-16 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; + Fix, factor and improve the (exact) simple 3D point criterion. + + * mln/topo/is_simple_point3d.hh + (mln::topo::is_simple_point3d<I, N>::operator()): + Honor the neighborhoods. + Use the new routines to compute the connectivity numbers instead + of computing them directly. + +2011-06-16 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; + Add routines to compute 3D connectivity numbers. * mln/topo/connectivity_number_3d.hh: New. diff --git a/milena/mln/topo/is_simple_point3d.hh b/milena/mln/topo/is_simple_point3d.hh index f63ea83..058fd97 100644 --- a/milena/mln/topo/is_simple_point3d.hh +++ b/milena/mln/topo/is_simple_point3d.hh @@ -35,47 +35,8 @@ # include <mln/core/concept/image.hh> # include <mln/core/concept/neighborhood.hh> -# include <mln/core/image/image3d.hh> -# include <mln/core/alias/neighb3d.hh> +# include <mln/topo/connectivity_number_3d.hh> -# include <mln/value/int_u8.hh> -# include <mln/value/int_u32.hh> - -# include <mln/labeling/blobs.hh> -# include <mln/fun/v2b/lnot.hh> -# include <mln/core/image/vmorph/fun_image.hh> -# include <mln/core/image/dmorph/image_if.hh> - - -// FIXME: Temporary. -/* A function stating whether a point of the box (-1,-1-1)-(+1,+1,+1) - is within the 18-c neighborhood of (0, 0, 0). */ -bool -f_within_c18(const mln::point3d& p) -{ - return !(mln::math::abs(p.sli()) == 1 - && mln::math::abs(p.row()) == 1 - && mln::math::abs(p.col()) == 1); -} - -// FIXME: Temporary. -// Associated functor. -struct within_c18 : mln::Function_v2b<within_c18> -{ - typedef bool result; - bool operator()(const mln::point3d& p) const { return f_within_c18(p); } -}; - - -/* FIXME: Factor code with is_simple_point2d. */ - -/* FIXME: BTW, we should implement a version of is_simple_point2d - based on a LUT as well. */ - -/* FIXME: Not that this routine produces false results when a point - has not exactly 26 neighbors (same issue with is_simple_point2d). - This functor should be placed in an `mln::topo::approx' namespace, - and an exact should be provided in addition. */ namespace mln { @@ -83,8 +44,6 @@ namespace mln namespace topo { - // FIXME: Honor the neighborhoods of the fore- and background. - /// \brief A predicate for the simplicity of an mln::point3d based /// on a look-up table. template <typename I, typename N> @@ -158,9 +117,6 @@ namespace mln ima_ = exact(&ima); } - // FIXME: Honor the neighborhoods of the fore- and background. - // FIXME: Move the computation of connectivity numbers out of this - // routine. template <typename I, typename N> inline bool @@ -169,61 +125,30 @@ namespace mln mln_precondition(ima_); const I& ima = *ima_; - /** Type of a connectivity number. - - Note: The maximun number of connected components in the - neighborhood of a point is necessarily lower or equal to - half the number of neighbors. This number fits on an - mln::value::int_u8 when the dimension is lower or equal - to 5. */ - typedef mln::value::int_u8 conn_number_t; - /// Type of a 3D (neighborhood) configuration number (index). - typedef mln::value::int_u32 config_3d_t; - - // Create a two 3x3 image representing foreground and background - // values in IMA around P. The value under P is always set to - // `false'. - box3d b = make::box3d(-1,-1,-1, 1,1,1); - I fg_ima_local(b, 0); - I bg_ima_local(b, 0); - mln::data::fill(fg_ima_local, false); - mln::data::fill(bg_ima_local, false); - point3d center(0, 0, 0); - mln_niter(N) n_ima(c26(), p); - mln_niter(N) n_local(c26(), center); - for_all_2(n_ima, n_local) - if (ima.has(n_ima)) - { - if (ima(n_ima)) - fg_ima_local(n_local) = true; - else - bg_ima_local(n_local) = true; - } - - // Foreground connectivity number. - conn_number_t fg_conn_number; - { - mln::neighb3d nbh = c26(); - labeling::blobs(fg_ima_local, nbh, fg_conn_number); - } - - // Background connectivity number. - conn_number_t bg_conn_number; - { - mln::neighb3d nbh = c6(); - conn_number_t unused_nl; - // Restrict the image to the 18-c neighborhood of P. - image_if<image3d<conn_number_t>, within_c18> lab = - labeling::blobs(bg_ima_local | within_c18(), nbh, unused_nl); - std::set<conn_number_t> s; - mln_niter(N) n(nbh, center); - for_all(n) - if (lab(n) != 0) - s.insert(lab(n)); - bg_conn_number = s.size(); - } - - return fg_conn_number == 1 && bg_conn_number == 1; + /* FIXME: Maybe we can select the connectivity number functions + once and for all when the functor is constructed, instead of + selecting them at each call of operator(). */ + bool result; + if (nbh_fg_ == c6() && nbh_bg_ == c26()) + result = + connectivity_number_3d_c6 (ima, p, true) == 1 && + connectivity_number_3d_c26(ima, p, false) == 1; + else if (nbh_fg_ == c26() && nbh_bg_ == c6()) + result = + connectivity_number_3d_c26(ima, p, true) == 1 && + connectivity_number_3d_c6 (ima, p, false) == 1; + else if (nbh_fg_ == c6() && nbh_bg_ == c18()) + result = + connectivity_number_3d_c6p(ima, p, true) == 1 && + connectivity_number_3d_c18(ima, p, false) == 1; + else if (nbh_fg_ == c18() && nbh_bg_ == c6()) + result = + connectivity_number_3d_c18(ima, p, true) == 1 && + connectivity_number_3d_c6p(ima, p, false) == 1; + else + abort(); + + return result; } # endif // MLN_INCLUDE_ONLY -- 1.7.2.5