--- scribo/ChangeLog | 6 ++ scribo/filter/object_groups_with_holes.hh | 87 ++++++++++++++++++---------- 2 files changed, 62 insertions(+), 31 deletions(-) diff --git a/scribo/ChangeLog b/scribo/ChangeLog index bd3f45d..8d151f4 100644 --- a/scribo/ChangeLog +++ b/scribo/ChangeLog @@ -1,3 +1,9 @@ +2010-08-04 Guillaume Lazzara <z@lrde.epita.fr> + + * filter/object_groups_with_holes.hh: Fix an invalid mismatch + between groups ids and their related component ids and add more + comments. + 2010-07-06 Guillaume Lazzara <z@lrde.epita.fr> Compilation related fixes in Scribo. diff --git a/scribo/filter/object_groups_with_holes.hh b/scribo/filter/object_groups_with_holes.hh index 570ae6a..28cd928 100644 --- a/scribo/filter/object_groups_with_holes.hh +++ b/scribo/filter/object_groups_with_holes.hh @@ -28,7 +28,8 @@ /// \file /// -/// \brief Remove groups not having a minimum number of holes. +/// \brief Remove groups not having at least two background components +/// of a minimum size. # include <sstream> @@ -37,6 +38,9 @@ # include <mln/core/routine/extend.hh> # include <mln/core/image/dmorph/extended.hh> +# include <mln/geom/ncols.hh> +# include <mln/geom/nrows.hh> + # include <mln/extension/duplicate.hh> # include <mln/draw/box_plain.hh> @@ -58,9 +62,8 @@ namespace scribo using namespace mln; - /*! \brief Remove groups not having a minimum number of holes. - - + /*! \brief Remove groups not having at least two background + * components of \p min_size pixels. */ template <typename L> @@ -108,8 +111,8 @@ namespace scribo b.enlarge(1); unsigned - nrows = b.pmax().row() - b.pmin().row() + 1, - ncols = b.pmax().col() - b.pmin().col() + 1, + nrows = geom::nrows(b), + ncols = geom::ncols(b), row_offset = lbl.delta_index(D(+1, -ncols)); mln_value(L) *ptr = &output(b.pmin()); @@ -146,18 +149,27 @@ namespace scribo // Grouping groups and relabel the underlying labeled image. // Groups are now considered as components. - component_set<L> components = primitive::group::apply(groups); + // + // The relabeling function used in group::apply is kept in + // order to map properly the groups and their new component + // id. + // + mln::fun::i2v::array<mln_value(L)> group_2_comp; + component_set<L> + components = primitive::group::apply(groups, group_2_comp); neighb2d nbh = c8(); image2d<unsigned> parent, card; L bboxes_ima; + // Will store the first background component id associated + // to a group. util::array<unsigned> bg_comps( static_cast<unsigned>(components.nelements()) + 1, 0); - util::array<bool> bg_comps_done( - static_cast<unsigned>(components.nelements()) + 1, false); + // Will 'True' if a group has at least two background + // components. fun::i2v::array<bool> to_keep(static_cast<unsigned>(components.nelements()) + 1, false); @@ -166,22 +178,26 @@ namespace scribo // init { - extension::fill(lbl, mln_max(mln_value(L))); -// extension::adjust_fill(components, nbh, mln_max(mln_value(L))); + // The border should be considered as the background. + extension::fill(lbl, literal::zero); + initialize(parent, lbl); data::fill(parent, 0u); + border::fill(parent, 0u); initialize(card, lbl); data::fill(card, 1); border::fill(card, 1); // We want to label background components only in the - // group bounding boxes. Thus, this image is a labeling - // constraint. + // group/component bounding boxes. This image is a + // labeling constraint. bboxes_ima = internal::compute_bboxes_image(components); - to_keep(0) = true; - } +// to_keep(0) = true; + + } // end of init + // 1st pass { @@ -212,11 +228,13 @@ namespace scribo } // for_all(pxl) - } + } // end of 1st pass + + unsigned kept = 0; + // 2nd pass { - unsigned kept = 0; mln_fwd_pixter(const L) pxl(bboxes_ima); // Forward. for_all(pxl) { @@ -241,38 +259,45 @@ namespace scribo && bboxes_ima.element(p) != literal::zero) { mln_value(L) group_id = bboxes_ima.element(p); - if (!bg_comps_done(group_id) && components(group_id).is_valid()) + if (!to_keep(group_id)) { + // The group must have at least 2 different + // background components. + // + // This is the first background component found. if (bg_comps(group_id) == 0) { bg_comps(group_id) = parent_p; } + // This is the second background component found. else if (bg_comps(group_id) != parent_p) { - bg_comps_done(group_id) = true; to_keep(group_id) = true; ++kept; } } } - } - - if (kept == components.nelements()) - { - trace::exiting("scribo::filter::impl::generic::object_groups_with_holes"); - return groups.duplicate(); - } + } // for_all(pxl) - object_groups<L> output = groups.duplicate(); - for_all_groups(c, groups) - if (! to_keep(groups(c))) - output(c) = 0; + } // end of 2nd pass + // No groups need to be invalidated. + if (kept == components.nelements()) + { trace::exiting("scribo::filter::impl::generic::object_groups_with_holes"); - return output; + return groups.duplicate(); } + // Invalidate groups when necessary. + object_groups<L> output = groups.duplicate(); + for_all_groups(c, groups) + if (! to_keep(group_2_comp(c))) + output(c) = 0; + + trace::exiting("scribo::filter::impl::generic::object_groups_with_holes"); + return output; + } } // end of namespace scribo::filter::impl::generic -- 1.5.6.5