"Chris Tolley" wrote in message
...
On Fri, 18 Feb 2005 18:53:51 +0000, Paul Terry wrote:

In message , Chris Tolley
writes

One frequently sees plates that are so filthy that no camera would pick
up any image.

The most common type of device (GATSO) makes an infra-red image as well
as a photographic one.

I didn't know that. Fascinating.




NOT TRUE.

2 standard colour 35mm exposures using flash illumination. Nothing infrared
involved with Gatsos.

Other systems using Automatic Number Plate Reading Video cameras (such as
SPECS average speed enforcement system) use infrared illumination. Gatso
doesn't.