Alt-BEAM Archive
Message #02816
To: Sean Rigter rigter@cafe.net
From: Steven Bolt sbolt@xs4all.nl
Date: Fri, 30 Apr 1999 19:59:52 +0200 (CEST)
Subject: [alt-beam] Re: HEAD APPLICATIONS (BICORE HEAD(WRONG APPROACH))
On Fri, 30 Apr 1999, Sean Rigter wrote:
> "real" applications I can think of (now) are:
>
> 1. solar targeting for: shades, PV array, freznel lens oven, plant
> orientation experiments ...
>
> 2. passive scanning photo radar: map light sources over 360 degree
> circle (sphere if dof=2) and "affect" bot behaviour...
You might like:
Linkname: Spider Vision
URL: http://www.xs4all.nl/~sbolt/e-spider_vision.html
In particular this bit:
When the Spider is on the move, motion detection is switched off.
The eye can than be used for radar-like scans of the environment,
perhaps looking for a dark place to hide...
A second look through the Spider's eye
Above: A scan around the room (over about 200 degrees) with moving
object detection switched off.
That little system does not use a `head'. Scanning occurs when the
Spider makes a turn on the spot.
> 3. active scanning photo radar: with IR transmitter (pulsed/synchronous
> detector?), same as 2.
True radar is hard to achieve - you won't get distance information
using IR at small 'bot ranges. The Spider uses IR as a left/right
virtual bumper.
> 4. object tracking camera mount (using 3 above)
Apart from the shades - that sounds like a down or up kind of
thing - Your applications 1 and 4 are indeed in the tracking
category, but require careful tuning of the hysteresis, and/or a
decreasing rotation speed as the target angle is approached. The
`head' circuitry so far discussed may not suffice. A nice approach
might be a fast-tracking head, generating an error signal for the
camera, PV array or fresnel lens to follow; rapidly when the error
is large, gradually slowing down as it approaches zero.
> and "surreal" applications like:
>
> 5. interactive head games: head watching, controlling and playing with
> "photo" target on video monitor. Play pong with head(s).
:)
Steve
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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