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MalcolmT
Nova Slayer



Joined: 23 Mar 2005
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PostPosted: 13:02 - 13 Jul 2005    Post subject: Photoblocker Reply with quote
Have any of you lads in the UK used this stuff.....

www.photoblocker.co.uk

Its just started being sold in South Africa and I was wondering if its any good.
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coldtoes
Derestricted Danger



Joined: 26 Mar 2004
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PostPosted: 13:07 - 13 Jul 2005    Post subject: Reply with quote
probably works the same way as the Anti Flash number plates. I knew somebody who got the Anti Flash number plates and tried taking a photo of it, and sure it does work, but got told of somebody else that they can take a negative image of the photo and get the number from that. Dont know how true that is, so be warned.
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Itchy
Super Spammer



Joined: 07 Apr 2005
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PostPosted: 13:49 - 13 Jul 2005    Post subject: Reply with quote
Some work , many do not , there was this bloke trying to sell it at the Manchester G Mex , luckily somebody had a polaroid camera and it was clear as day hence lots of snake oil products.


There is one from the US which was debated at length on the radio and that police tried to get it banned, I can't recall the result of this.
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Chriss
World Chat Champion



Joined: 07 May 2005
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PostPosted: 15:38 - 13 Jul 2005    Post subject: Reply with quote
I know someone who used a similar spray, went through a speed camera, got done for speeding and some other offense (I think it was attempting to pervert the course of justice) for trying to hide the number plate.

I say it's not worth the risk. Just get a radar detector. Wink
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BFG
Brolly Dolly



Joined: 14 Feb 2005
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PostPosted: 16:00 - 13 Jul 2005    Post subject: Reply with quote
It might be all irrelevant now. Copper told me almost all cameras have been switched over to infra red. The flash is just done as a deterrent to other drivers, but doesn't actually do anything.

The IR cameras not only work in the dark, but can see through pretty much everything. Even heavy mud.

Though not, I suspect, an infra-red source near the number plate. hmm.
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Suzuki
Roger



Joined: 03 May 2005
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PostPosted: 16:09 - 13 Jul 2005    Post subject: Reply with quote
BFG wrote:
The IR cameras not only work in the dark, but can see through pretty much everything. Even heavy mud.

Sounds like bullshit mate.

As you know, infrared cameras pick up the differences in levels of heat, with the hottest things being white, and the coldest being black.
Human bodies come up with near-white heads, red bodies, and blue-ish extremities.

Why would the letters on your numberplate be any hotter than the rest of the plate? If they're all the same temperature, then the plate will be a solid colour.
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Zoffo
Brolly Dolly



Joined: 01 Feb 2005
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PostPosted: 16:18 - 13 Jul 2005    Post subject: Reply with quote
coldtoes wrote:
probably works the same way as the Anti Flash number plates. I knew somebody who got the Anti Flash number plates and tried taking a photo of it, and sure it does work, but got told of somebody else that they can take a negative image of the photo and get the number from that. Dont know how true that is, so be warned.


Anti flash numberplates DO NOT WORK. A friend of mine was present when the police tested every antiflash numberplate on the market. None of them worked.
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Last edited by Zoffo on 17:01 - 13 Jul 2005; edited 1 time in total
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MalcolmT
Nova Slayer



Joined: 23 Mar 2005
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PostPosted: 16:31 - 13 Jul 2005    Post subject: Reply with quote
BFG wrote:

The IR cameras not only work in the dark, but can see through pretty much everything. Even heavy mud.



I would expect the trye and exhaust to be a pretty good source of IR. Maybe even read the plate but not through mud, that needs x-rays.

Last edited by MalcolmT on 16:41 - 13 Jul 2005; edited 1 time in total
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colin1
Captain Safety



Joined: 17 Feb 2005
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PostPosted: 16:39 - 13 Jul 2005    Post subject: Reply with quote
suzuki, there are different types of infra red cameras
you are talking about heat sensitive ones but infrared cameras are used for seeing at night aswell. think of the black and green images from night sights

some are active as on a cheap camcorder i have. it has an IR light which illuminates what ever is in front of it and the IR wavelength 'light' is refelct back towards the camera lense off the object

this sort would be suitable for speed cameras

passive ones dont use a IR light source and so need to be more sensitive, are more expensive and probably wdnt show up detail on a number plate

some local chavs simply cover their number plate with a piece of paper

on ebay i saw a device a bit like the thing used by james bond that at the flick of a switch could cover up your license plate and then uncover it when required
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MalcolmT
Nova Slayer



Joined: 23 Mar 2005
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PostPosted: 16:39 - 13 Jul 2005    Post subject: Reply with quote
Itchy wrote:
Some work , many do not , there was this bloke trying to sell it at the Manchester G Mex , luckily somebody had a polaroid camera and it was clear as day hence lots of snake oil products.



I was at G Mex a couple of years ago and spoke to a guy flogging invisible plates. I tried to email him for some time after the exhibition with no luck. Looks like the gods were smiling on me for once.
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BFG
Brolly Dolly



Joined: 14 Feb 2005
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PostPosted: 18:53 - 13 Jul 2005    Post subject: Reply with quote
Suzuki wrote:
BFG wrote:
The IR cameras not only work in the dark, but can see through pretty much everything. Even heavy mud.


Sounds like bullshit mate.



It's not. The "IR = heat only" fallacy is hollywood science. Trust me, I'm an engineer Wink.
Anyhoo - I was there - he showed me IR pictures, the plate was visible even with duct tape over it (at short range anyway).

The IR = Heat is partly true, as humans can detect IR only in the form of heat, as we can't see the light itself. But cameras can.
And IR can see through objects to a small degree. certainly enough to go through mud.

Also remember, that these cameras are not measuring IR. They are projecting IR and then measuring the reflections.

Here's an example of using a camera for IR reception:
Note the T-Shirt, the money, the veins - all examples of seeing through outer layers.:
https://homepage.ntlworld.com/geoff.johnson2/IR/

Here's another about mud over number plates - there's an IR reference half-way down.
https://www.wired.com/news/autotech/0,2554,67794,00.html
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carvell
Scuttler



Joined: 05 Sep 2003
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PostPosted: 18:55 - 13 Jul 2005    Post subject: Reply with quote
Suzuki wrote:
Sounds like bullshit mate.

As you know, infrared cameras pick up the differences in levels of heat, with the hottest things being white, and the coldest being black.
Human bodies come up with near-white heads, red bodies, and blue-ish extremities.

Why would the letters on your numberplate be any hotter than the rest of the plate? If they're all the same temperature, then the plate will be a solid colour.

What?!

You're the only one talking bullshit...mate!

It's only projecting infrared light, exactly the same as a torch, only in a light spectrum so humans can't see it, not thermal imaging.
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