[Bug 643252] Improve opencv facedetect performance

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=643252
  GStreamer | gst-plugins-bad | git

--- Comment #15 from Robert Jobbagy <jobbagy.robert at gmail.com> 2011-07-30 11:43:20 UTC ---
Test Pipeline:

gst-launch-0.10 -m v4l2src !
video/x-raw-yuv,width=320,height=240,framerate=20/1 ! ffmpegcolorspace !
facedetect
profile=/usr/local/share/opencv/haarcascades/haarcascade_frontalface_alt2.xml
display=true ! ffmpegcolorspace ! xvimagesink

Test notebook: Asus K42Jv

Without my patch

works all 4 thread about 70-80 % 

and display play ~ 1 fps :(

With my patch:

one thread ~ 25 % 
and other three thread ~ 15 %

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