Alt-BEAM Archive

Message #02821



To: Steven Bolt sbolt@xs4all.nl
From: Sean Rigter rigter@cafe.net
Date: Fri, 30 Apr 1999 11:40:39 -0700
Subject: [alt-beam] Re: HEAD APPLICATIONS (BICORE HEAD(WRONG APPROACH))


Dear Steven,

BEAM limits exceeded, must get baaacckkk!
Too late, caught in your Spider's vision!
There is more 'tween Vcc and Gnd than Beam it seems.
A tasty treasure for sure. Will spend more time here.

:)

BTW what happens when you point your Spider vision
at the monitor screen. Does recursion make it go
"crazy" or does it blow up when it "sees" itself?

:)

wilf


Steven Bolt wrote:
>
> 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
>
> ----------------------------------------------------------------------
> # sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
> ----------------------------------------------------------------------

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