[Bug 704070] video: Add Region Of Interest (roi) meta

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704070
  GStreamer | gst-plugins-base | 1.x

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |t.i.m at zen.co.uk
     Ever Confirmed|0                           |1

--- Comment #2 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-07-12 09:48:46 UTC ---
<__tim> might one want/need some kind of shape-extension in future for the ROI?
to indicate that it's more than a rectangle? or a probability perhaps? what
about points of interest within the ROI? or ROIs (eyes,mouth,nose) within a
ROI?
<wtay`> with an id you could make parent-child relations
<wtay`> not sure about shapes, it sounds maybe too much for now
<__tim> right, just saying one might want to leave some possibility of
expansion
<wtay`> a probability, maybe dunno what it would mean
<wtay`> yes, but if you think of them now we can add them now
<wtay`> with an id per ROI we can always add more metadata to describe the ROI
some more
<__tim> like the probability that this ROI resembles a face (though maybe one
would just set the threshold on the facedetect element and not comunicate it)
<wtay`> or maybe add metadata to group ids
<wtay`> but a roi as the parent with a quark that mentions the grouptype etc
sounds enough for now
<__tim> as for 'shape', I was mostly thinking of whether it's a bounding
rectangle, and what kind of shape is inside it
<__tim> or whether the ROI is the entire rectangle, sort of
<__tim> not sure if it matters, it might if you have an element whose purpose
is to blur detected areas (though it could also have a hard-coded list of known
ROI types then)
<slomo> for an arbitrary shape... you might need more than 4 parameters to
define it
<__tim> yeah, I don't know if we need to express "arbitrary shapes"
<wtay`> let's make sure it is advertized as a ROI bounding box, maybe we can
add the exact shape in another meta when needed

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