From: waleed@cse.unsw.edu.au (Mohammed Waleed Kadous)
Subject: Re: TECH: tetherless trackers
Date: 30 Sep 1995 01:25:01 GMT
Message-ID: <44i69d$142@mirv.unsw.edu.au>
Organization: University of New South Wales



From: waleed@cse.unsw.edu.au (Mohammed Waleed Kadous)

Chris Hand (cph@dmu.ac.uk) wrote:

: In theory, video-based tracking can achieve 6DOF with no wires on
: the user (although they might have to stick coloured spots on 
: various extremeties, so I suppose this isn't sourceless as such).  

I'm just curious, but how? How would you get a measurement of distance
(with two cameras maybe, but still computationally difficult) in an
accurate way? Sure, the image of the hand would be smaller as you got
further away, but pixelisation would blow your accuracy out of the
water.  I'm probably missing something obvious. X and Y no problem,
what about Z?

Also, getting angle measurements is not trivial - where do you put the 
dots in such a way as they're never obstructed, and what about the effect 
of flexing your hands which would move the dots around (we assume the 
hand is flat, but because each finger has 4 joints -- one close to the 
wrist - the metacarpals I think? -- the hand isn't.

This isn't a criticism, I'm just wondering.   

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