[Bug 730509] facedetect: fix update on change

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730509
  GStreamer | gst-plugins-bad | 1.x

--- Comment #5 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2014-07-21 18:48:50 UTC ---
(In reply to comment #4)
> on_change:
> 
> - face detected => bus message
> - face detected => no bus message
> - face detected => no bus message
> - no face detected => bus message
> - no face detected => no bus message
> - no face detected => no bus message
> - face detected => bus message
> 
> on_face:
> 
> - face detected => bus message
> - face detected => bus message
> - face detected => bus message
> - no face detected => no bus message
> - no face detected => no bus message
> - face detected => bus message
> 
> is clear now?

Yes, maybe it can be reworded:
(1): on_change        - Send messages when a new face is detected or one is not
anymore detected
(2): on_face          - Send messages whenever a face is detected

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