Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!edcastle!elee24
From: elee24@castle.ed.ac.uk (H Bruce)
Newsgroups: comp.graphics
Subject: Removing lighting variation caused by mains "flicker".
Message-ID: <5850@castle.ed.ac.uk>
Date: 21 Aug 90 15:06:21 GMT
Organization: Dept. Electrical Engineering, Edinburgh University, Scotland, UK.
Lines: 12

I am working on a project that uses a camera that takes pictures illuminated by
mains lighting. Unfortunately the camera is not "synced" to the mains so
bars of varying intensity appear in the image. The causes problems when I 
perform inter-frame differencing to achieve compression of a sequence of
transmitted images.

Does anyone know of any proven techniques to counteract this effect
(ie some form of normalisation) and where references to them may be found ?

Thanks,

Henry Bruce.