[Olena-patches] 4708: Improve line pattern recognition routine.

* primitive/extract/lines_pattern.hh: Make it less tolerant. --- scribo/ChangeLog | 6 ++++++ scribo/primitive/extract/lines_pattern.hh | 19 ++++++++++++++++--- 2 files changed, 22 insertions(+), 3 deletions(-) diff --git a/scribo/ChangeLog b/scribo/ChangeLog index 42d59dd..b04de6a 100644 --- a/scribo/ChangeLog +++ b/scribo/ChangeLog @@ -1,5 +1,11 @@ 2009-11-03 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; + Improve line pattern recognition routine. + + * primitive/extract/lines_pattern.hh: Make it less tolerant. + +2009-11-03 Guillaume Lazzara &lt;z(a)lrde.epita.fr&gt; + Add new debug tools. * src/debug/Makefile.am: Add new targets. diff --git a/scribo/primitive/extract/lines_pattern.hh b/scribo/primitive/extract/lines_pattern.hh index 6a69a4a..57958ec 100644 --- a/scribo/primitive/extract/lines_pattern.hh +++ b/scribo/primitive/extract/lines_pattern.hh @@ -62,6 +62,7 @@ namespace scribo /// \param[in] win_ A window corresponding to the line pattern. /// /// \return A image with lines of direction \p dir. + /// // template <typename I, typename W> mln_concrete(I) @@ -92,19 +93,31 @@ namespace scribo mln_piter(I) p(input.domain()); mln_qiter(window2d) q(win, p); + bool is_foreground; for_all(p) { + + // If the foreground part of the pattern has more than 20% + // of background pixels, the current pixel is considered as + // background pixel. if (length - tmp(p) > (0.2f * length)) { output(p) = false; continue; } - unsigned bg_count = 0; + // If the background parts of the pattern have less than 95% + // of foreground pixels, the current pixel is considered as + // part of the background. + is_foreground = true; for_all(q) - bg_count += tmp(q); + if ((length - tmp(q)) < (length * 0.95f)) + { + is_foreground = false; + break; + } - output(p) = (2 * length - bg_count) > (2 * length * 0.90f); + output(p) = is_foreground; } -- 1.5.6.5