From: 85p8379@csdvax.csd.unsw.oz.au (Barry Manor)
Subject: Eye-tracking system proposed
Date: 30 Jun 91 01:23:47 +1000
Message-ID: <1991Jun30.012347.235@csdvax.csd.unsw.oz.au>
Organization: University of New South Wales



It is possible (and perhaps intuitively sensible) that the 'head-position
tracking device' is in fact an eye-tracking device.  If this were to be the 
case, then no tracking sensors need be worn, because the eye can be tracked
directly using infra-red illumination, purkinje reflections, low-light video
camera and a frame-grabber.

If anyone is interested in learning more about this system I'd be happy to 
elaborate...

Barry Manor
Biomedical Engineering
University of New South Wales/Westmead Hospital
Sydney, Australia.

[MODERATOR'S NOTE:  Generally, in an inclusive virtual space, both the
head and eyes must be tracked, independently, to render both the stabilized
world and specifically that part within it that has the foveal gaze.  But
I could be getting beyond myself.  Perhaps one could explore using the
infrared lumination method (already somewhat common for eye-tracking) to
center the entire head position?  Comments?  -- Bob Jacobson]