"Paul Weaver" wrote in message
news
On Sat, 18 Oct 2003 11:24:11 +0000, Martin Underwood wrote:
I can certainly think of a way that the cameras could be fooled using a
system that *does* require power - the details given on the web site
together which a "well, fancy that" discovery that I made when using a
CCD-based video camera give the game away. But I won't say any more than
that.

Infrared is usually picked up by cameras, so a few bright LED's will blind
them.

Easily stopped though with a decent filter.

Exactly - that's what I was thinking of. You only have to point a TV remote
at a still or video camera to see the LED glowing in the camera image. I
*presume* that speed and CC cameras include an IR filter - if not, it
wouldn't be hard to fit one!

So I presume that the system described on the web site uses a different
technique.