[comp.graphics] Removing lighting variation caused by mains "flicker".

elee24@castle.ed.ac.uk (H Bruce) (08/21/90)

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.