From: Joerg Richard Weimar (jweimar@ulb.ac.be)
Date: Thu May 06 1993 - 12:48:39 UTC
In article <C6KD2J.11z@news2.cis.umn.edu> arnim@htlv.med.umn.edu (Arnim
Sauerbier) writes:
> For some time now, I've been interested in reproducing the effects of
> video-feedback on Autodesk's Cellular Automata Lab.
From my experiments with video cameras, I would like to point out that
1. Autofocus introduces some global change, with a certain delay.
2. Automatic brightness adjustments also lead to global oscillations.
3. If the camera is slightly rotated around he optical axis with respect
to the monitor, you get interesting effects, but this introduces a global
rotation, which is practically impossible to mimic with CA's (because
there is a global reference point)
To conclude: with a CA you could only mimic the experiments where all
controls are fixed and the camera doesn't do any automatic adjustments.
Also the camera needs to be aligned exactly with the monitor, and the
field of view must be exactly filled with the monitor.
I doubt that the patterns in this regime are as interesting as the ones
you get.
--
Joerg R. Weimar
#!###!!!##!!#!#!!!###!!##!!##!!!###!!!##!!##!#!#!#####!#!##!
jweimar@ulb.ac.be (NeXTMail welcome)
Service de Chimie Physique II, Universite Libre de Bruxelles
#!##!##!#!#!#!!!##!!#!#!#!#!##!##!#!##!#!##!##!!#!#!#!##!#!#
This archive was generated by hypermail 2.1.7 : Tue Oct 14 2003 - 21:44:13 UTC