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Speed Camera Avoidance
"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. |
#2
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Speed Camera Avoidance
In message , Graeme
writes NOT TRUE. 2 standard colour 35mm exposures using flash illumination. Nothing infrared involved with Gatsos. So are websites such as http://www.termsys.demon.co.uk/gatso.htm wrong when they claim ... The photographs taken will be both normal and infra-red. (The infra-red will 'see' your registration mark when the vehicle is caked in dirt.) Also, to collect the proof, two photographs are taken in quick succession, so that the distance travelled can be seen. And http://www.benlovejoy.com/speedtrapdetectors.html ... with its picture of "A forward-facing infra-red Gatso hidden behind a sign" Gatsometer's own site claims that they make GATSOs "with optional infra-red flash", but I have no idea if these are used in the UK. Other systems using Automatic Number Plate Reading Video cameras (such as SPECS average speed enforcement system) use infrared illumination. Gatso doesn't. I believe the Truvelo system also uses I-R. Basically, if I-R is being used at all, and it certainly appears to be, then I cannot see how a reflective spray varnish will help to avoid it. -- Paul Terry |
#3
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Speed Camera Avoidance
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#4
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Speed Camera Avoidance
"Paul Terry" wrote in message ... In message , Graeme writes NOT TRUE. 2 standard colour 35mm exposures using flash illumination. Nothing infrared involved with Gatsos. So are websites such as http://www.termsys.demon.co.uk/gatso.htm wrong when they claim ... The photographs taken will be both normal and infra-red. (The infra-red will 'see' your registration mark when the vehicle is caked in dirt.) Also, to collect the proof, two photographs are taken in quick succession, so that the distance travelled can be seen. Yes - they are wrong. Serco's back office systems include wet-film viewers that can invert the images and this often helps to see plates that can't be seen normally. And http://www.benlovejoy.com/speedtrapdetectors.html ... with its picture of "A forward-facing infra-red Gatso hidden behind a sign" Gatsometer's own site claims that they make GATSOs "with optional infra-red flash", but I have no idea if these are used in the UK. If you want it from the horse's mouth - why don't you ask the Warwickshire or Sussex Partnerships who will be delighted to tell. Essex have experimented with front-facing photography to supplement their successful (!) Gatso-based campaign, but they do NOT have approval (to the best of my knowledge) as these images are triggered in the same way as a slave flash gun is in photography. There is a big demand to identify offending drivers and this is Gatso's attempt to help Essex achieve that result. Again, to my knowledge the optional IR illumination that Gatso offer is not approved for use here. They have a shed load of products that are used elsewhere in the world, but that are not approved for use here. Other systems using Automatic Number Plate Reading Video cameras (such as SPECS average speed enforcement system) use infrared illumination. Gatso doesn't. I believe the Truvelo system also uses I-R. Truvelo have approval for a front facing camera that uses three piezo strips in the road and NO radar, but due to it's front-facing nature, they are obliged to use a magenta filter over the flash to avoid blinding on-coming (offending!) drivers. It's not IR. Basically, if I-R is being used at all, and it certainly appears to be, then I cannot see how a reflective spray varnish will help to avoid it. -- Paul Terry |
#5
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Speed Camera Avoidance
In message , Graeme
writes So are websites such as http://www.termsys.demon.co.uk/gatso.htm wrong Yes - they are wrong. I see. Truvelo have approval for a front facing camera that uses three piezo strips in the road and NO radar, but due to it's front-facing nature, they are obliged to use a magenta filter over the flash to avoid blinding on-coming (offending!) drivers. It's not IR. What is your evidence for that? Sorry to sound doubtful, but Google for Truvelo "infra red" and you will find many, many websites like http://www.radardetectors.co.uk/faqs.htm ... Q What is the Truvelo system? A This is easy to spot because it's a forward facing camera with pressure strips across the road in front of it. The time and distance of a vehicle's axles passing over these strips are measured to calculate speed and a photo is then taken if you are considered to be over the speed limit. Like the SPECS system the picture is taken using infra red so you do not see a flash. Or is this yet another website that is wrong? -- Paul Terry |
#6
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Speed Camera Avoidance
Northampton Safety Camera Partnership use Truvelo front-facing piezo
triggered cameras. I've visited the manufacturer in South Africa and, to the best of my knowledge they DO flash if you're dumb enough to speed as you approach one ! The flash is magenta to avoid blinding approaching drivers. This was developed in order to get the product through Home Office Type Approval (HOTA) and agreed by the Police Scientific Development Branch who are the test body for such approvals. You _do_ see a flash with Truvelo, you do _not_ see a flash with SPECS as the video cameras are constantly live and use IR filtered lamps and lenses because that is the best way of delivering 24/7 images to the underlying Automatic Number Plate Reader (ANPR) systems - assuming the numberplates being viewed are retroflective - which they ARE in the UK. As Truvelo cameras do NOT use ANPR and are designed to provide the best image of an approaching, offending vehicle, there would be no sense in using IR. |
#7
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Speed Camera Avoidance
On Sat, 19 Feb 2005 18:01:44 +0000, Paul Terry
wrote: And http://www.benlovejoy.com/speedtrapdetectors.html ... with its picture of "A forward-facing infra-red Gatso hidden behind a sign" Look closely at the picture - it's NOT a Gatso. It's a Truvelo (and so has a magenta filter over the flash - it's NOT infra-red). -- Philip [Don't top post. Quote selectively. Don't use HTML. Enjoy Usenet] |
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