[Bug 702722] opencv: add GrabCut segmentation element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702722
  GStreamer | gst-plugins-bad | 1.x

--- Comment #7 from Miguel (elmiguelao) Casas-Sanchez <miguelecasassanchez at gmail.com> 2013-07-10 15:10:33 UTC ---
On second thoughts after your comments, I removed all this by default numbers,
and moved the check for bounding box correctness before calling grabcut (to
avoid that assert mentioned before). Also updated the documentation and the
comments on top of the file, hence now the idea would be to use alpha mask in,
if not present bounding box, if not just skip the frame and show a warning. The
original by default values made sense for certain applications, but to be
generic here would not relevant, the warning+documentation should be enough.
Patch coming!

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