[Bug 730510] New: facedetect: improve performance

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730510
  GStreamer | gst-plugins-bad | 1.x

           Summary: facedetect: improve performance
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lists at svrinformatica.it
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=276930)
 View: https://bugzilla.gnome.org/attachment.cgi?id=276930
 Review: https://bugzilla.gnome.org/review?bug=730510&attachment=276930

proof of concept patch

this is a proof of concept patch, basically I noted that if I have a completly
black image facedetect use more cpu than for a normal image, 

this patch calculate the standard deviation and perform facedetection only if
that deviation is > 20 (hardcoded for now),

what do you think about? If I add a property to control the deviation value
will this be accepted? Probably this apply to other opencv elements too

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