There's this one as well, apparently it works, i'm going to try it soon,
looks simple
http://www.free-track.net/home.php
2010/2/28 Melchior FRANZ <mfr...@aon.at>
> Head trackers determine the position and orientation of the computer user's
> head, and use this information to modify the view in the artificial 3D
> world.
> Usually, this requires a sensor (e.g. a webcam) and special markers mounted
> on a helmet or cap. This can be colored/reflective points or even (IR)LEDs.
>
> There's a (F/OSS) implementation of a head-tracker that only requires a
> webcam, without the head gear: EHCI[0] (based on OpenCV[1]). It works with
> a face detection algorithm. See the following link for a demo. It shows the
> analyzed face features on the left side, and an overlaid 3D head on the
> right side.
>
> http://www.youtube.com/watch?v=BovphSjw_tI
>
> Unfortunately, it doesn't work as well as the film implies. The guy took
> care of not turning the head too far and keeping the face rectangle nicely
> on screen. If one doesn't do that, then the orientation quickly drifts off,
> and one has to reset the tracker.
>
> Anyway, in the hope to see further EHCI improvements in the future, I've
> written an fgfs addon that uses the tracker information to control the
> pilot's view. It's a separate application that communicates via UDP socket
> with fgfs, and there are no changes to fgfs (2.0!) necessary. See the
> README
> for further info:
>
> $ git clone git://
> gitorious.org/fg-ehci-headtracker/fg-ehci-headtracker.git
>
> Maybe someone is interested in this *and* can perhaps even send me patches
> for improvements/fixes. :-)
>
> Note that the EHCI library is a bit strange (to put it politely), which
> explains some of the fg-tracker weirdness. Also note, that you have to
> use it in not too dark environment (or maybe use an IR spot, haven't tried
> that yet). And I assume you should have a dual core/cpu machine at least.
> The tracker uses quite some cpu power for image processing, so it shouldn't
> run on the same cpu/core as fgfs.
>
> m.
>
>
> PS: don't expect too much!
>
> [0] http://sourceforge.net/projects/opencvlibrary/
> [1] http://code.google.com/p/ehci/
>
>
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