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Car Forum / Land Rover Cars / January 2006

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Thoughts on numberplate recognition

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Larry - 29 Jan 2006 16:17 GMT
I have been wondering how the software works, I presume it scans the area of
the front and rear of the vehicle looking for something close enough to the
accepted font to read it.

Supposing one had more than one plate, now the second plate need not be a
false numberplate, just something obvios enough to plod to be a sign or show
plate but using the accepted font, how would the software react ?

The law with regard to plates seems to be a bit of an a.s anyway, so far as
I know it is not illegal to buy plates abroad without producing a V5C and
whilst it might technically be an offence to fit them as new plates, if I am
going for the historic look who is going to tell they are not originals, or
care, so long as the numbers are legible and close enough.

Signature

Larry
Series 3 rust and holes

itcosthowmuch????? - 30 Jan 2006 13:45 GMT
> I have been wondering how the software works, I presume it scans the area of
> the front and rear of the vehicle looking for something close enough to the
[quoted text clipped - 13 lines]
> Larry
> Series 3 rust and holes

For my sins I worked on the London congestion charging systems at a
high technical level  working on all aspects of the system , I can tell
you how to piss them off big time ! .

Automatic number plate recognition systems work by looking for a
readable set of text , this can be on full motion video or stills,
normally the system will read the plate and store around 2 to 3 seconds
of images either side of this for context information to stop any
argument ,

As for having a second plate with other text on , firstly this is not
illegal ! , just think of things like lorries with name plates , on tow
plates etc . when the congestion charge first started  people had
number plates made up with  fu k3n ( fu ken ) and displayed them , the
system did pick them up as well as a number of taxi plates football top
names etc so how are they sorted ?

If the system gets a readable match it checks the read against  a black
list (fu k3n , on tow ,taxi etc ) if it is not found on the list it is
checked with  DVLA for conformation that the plate exists if this come
back ok it will store the images and data .

For non reads , no match or  multiple matches , it is marked as
unreadable and past for human inspection

VRM plates do have a legal requirement as we all know  and a v5 is now
required
But you can make any type of sign !
mark - 30 Jan 2006 15:20 GMT
>VRM plates do have a legal requirement as we all know  and a v5 is now
>required
>But you can make any type of sign !

But what is exactly wrong with buying plates from abroad (that comply
with the legal requirements) and fitting them to your car?

Signature

Mark Roberts

Darren Griffin - PocketGPSWorld.Com - 30 Jan 2006 16:39 GMT
> But what is exactly wrong with buying plates from abroad (that comply
> with the legal requirements) and fitting them to your car?

Is it even possible to buy plates abroad that are marked as complying with
the legal requirements?
Signature

Darren Griffin
PocketGPSWorld - www.PocketGPSWorld.com
The Premier GPS Resource for News, Reviews and Forums

Matthew Maddock - 30 Jan 2006 16:55 GMT
> Is it even possible to buy plates abroad that are marked as complying with
> the legal requirements?

Not that I know of, although I did see someone [in France] with a UK
registration mark made up on the French style plate (embossed metal
type) fitted on their trailer.  It didn't look too dissimilar, but I
somehow doubt it is legal in the UK.

Matt
Larry - 30 Jan 2006 18:42 GMT
The point is not whether it is legal or not but whether without raiding ones
home for reciepts and accessing ones bank account, it would be practically
impossible to prove or even detect for an older vehicle so long as the
plates did not look shiny shiny new.

My present plates, acrylic thought they be are not up to modern spec I would
think, cos they likely don't have the manufacturer on em.

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þT

L'autisme c'est moi

"Space folds, and folded space bends, and bent folded space contracts and
expands unevenly in every way unconcievable except to someone who does not
believe in the laws of mathematics"
Larry

> Not that I know of, although I did see someone [in France] with a UK
> registration mark made up on the French style plate (embossed metal
> type) fitted on their trailer.  It didn't look too dissimilar, but I
> somehow doubt it is legal in the UK.
>
> Matt
Larry - 30 Jan 2006 18:38 GMT
Yes

Signature

Larry
Series 3 rust and holes

> Is it even possible to buy plates abroad that are marked as complying with
> the legal requirements?
Dave P - 30 Jan 2006 16:39 GMT
>But what is exactly wrong with buying plates from abroad (that comply
>with the legal requirements) and fitting them to your car?

IIRC, UK plates must have the postcode of the shop/dealer they were
issued from to be legal.  Whether you think you might be stopped just
because a copper can't see a tiny postcode on your plate remains to be
seen.  Mine are from Halford's, and the postcode is barely visible even
looking at the plate from 12" away, being sorta embedded in the
plastic.  Still, they're legal.  How many million miles you could drive
on average before being stopped is a matter for conjecture.

DaveP
Larry - 30 Jan 2006 18:43 GMT
Only if they are renewed, this is not a requirement of existing plates, my
point is who would either ever tell or be that pedantic to bother, it is
like getting a ruler out and measuring the font.

Signature

Larry
Series 3 rust and holes

> >But what is exactly wrong with buying plates from abroad (that comply
> >with the legal requirements) and fitting them to your car?
[quoted text clipped - 8 lines]
>
> DaveP
Matthew Maddock - 30 Jan 2006 19:09 GMT
> my
> point is who would either ever tell or be that pedantic to bother, it is
> like getting a ruler out and measuring the font.

I wouldn't put it past the Police to do that!

Matt.
Dougal - 30 Jan 2006 19:10 GMT
>> my
>> point is who would either ever tell or be that pedantic to bother, it is
[quoted text clipped - 3 lines]
>
> Matt.

... but could they be trusted to report correctly on their findings?
mark - 30 Jan 2006 18:53 GMT
>>But what is exactly wrong with buying plates from abroad (that comply
>>with the legal requirements) and fitting them to your car?
[quoted text clipped - 6 lines]
>plastic.  Still, they're legal.  How many million miles you could drive
>on average before being stopped is a matter for conjecture.

More insanity.
I take it the law is there to stop people from putting false or
defective plates on their car. Bloody typical that you could be nicked
for having proper plates on your own car because the plates lack a
postcode.
Signature

Mark Roberts

Simon Isaacs - 30 Jan 2006 19:15 GMT
>>But what is exactly wrong with buying plates from abroad (that comply
>>with the legal requirements) and fitting them to your car?
[quoted text clipped - 8 lines]
>
>DaveP

yeah, but the ones for sale at shows never come with the postcode
stamped on them, and you don't need your V5, proof of address, and
great great grandparents with you to prove who you are!
Signature


Simon Isaacs

Peterborough 4x4 Club Newsletter Editor and Webmaster
Green Lane Association (GLASS) Financial Director
101 Ambi, undergoing camper conversion www.simoni.co.uk
1976 S3 LWT, Fully restored, ready for sale!  Make me an offer!
Suzuki SJ410 (Wife's) 3" lift kit fitted, body shell now restored and mounted on chassis, waiting on a windscreen and MOT
Series 3 88" Rolling chassis...what to do next
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1994 200 TDi Discovery body sheel, being bobbed and modded.....

Dougal - 30 Jan 2006 19:36 GMT
>>>But what is exactly wrong with buying plates from abroad (that comply
>>>with the legal requirements) and fitting them to your car?
[quoted text clipped - 12 lines]
> stamped on them, and you don't need your V5, proof of address, and
> great great grandparents with you to prove who you are!

Watch this space - that's not quite what Tony seems to think!
Austin Shackles - 31 Jan 2006 12:34 GMT
>>>But what is exactly wrong with buying plates from abroad (that comply
>>>with the legal requirements) and fitting them to your car?
[quoted text clipped - 12 lines]
>stamped on them, and you don't need your V5, proof of address, and
>great great grandparents with you to prove who you are!

ah, but they're "show plates, not for road use"

meanwhile... the regulations about postcode apply to new plates issued after
2001.  They also apply to new plates put on older vehicles.  but if you
replace the plates on an older vehicle and use traditional ones, you simply
claim that it was done prior to 2001.
Signature

Austin Shackles.  www.ddol-las.net  my opinions are just that
Too Busy:  Your mind is like a motorway.  Sometimes it can be jammed by
too much traffic.  Avoid the jams by never using your mind on a
Bank Holiday weekend.
from the Little Book of Complete B***ocks by Alistair Beaton.

Dave P - 30 Jan 2006 16:39 GMT
>But what is exactly wrong with buying plates from abroad (that comply
>with the legal requirements) and fitting them to your car?

IIRC, UK plates must have the postcode of the shop/dealer they were
issued from to be legal.  Whether you think you might be stopped just
because a copper can't see a tiny postcode on your plate remains to be
seen.  Mine are from Halford's, and the postcode is barely visible even
looking at the plate from 12" away, being sorta embedded in the
plastic.  Still, they're legal.  How many million miles you could drive
on average before being stopped is a matter for conjecture.

DaveP
Erik-Jan Geniets - 30 Jan 2006 15:22 GMT
> For my sins I worked on the London congestion charging systems at a
> high technical level  working on all aspects of the system , I can tell
> you how to piss them off big time ! .

<cut>

> For non reads , no match or  multiple matches , it is marked as
> unreadable and past for human inspection

So this means you can't piss them off because it will be marked for
human inspection?
Kind regards,
Erik-Jan.
Paul S. Brown - 30 Jan 2006 15:36 GMT
>> For my sins I worked on the London congestion charging systems at a
>> high technical level  working on all aspects of the system , I can tell
[quoted text clipped - 9 lines]
> Kind regards,
> Erik-Jan.

What's the regs on displaying 2 valid numberplates - possibly for the same
class of car - you're technically displaying the valid one, just also
displaying a spoiler too :)

P.
Austin Shackles - 30 Jan 2006 18:37 GMT
>What's the regs on displaying 2 valid numberplates - possibly for the same
>class of car - you're technically displaying the valid one, just also
>displaying a spoiler too :)

yer not allowed to obscure the number plate though.

everyone ought to find out what red Ken's number plate is and use that...
Signature

Austin Shackles.  www.ddol-las.net  my opinions are just that
"'Tis a mad world, my masters"  John Taylor (1580-1633) Western Voyage, 1

Dave Liquorice - 30 Jan 2006 22:04 GMT
>> What's the regs on displaying 2 valid numberplates - possibly for the
>> same class of car - you're technically displaying the valid one, just
>> also displaying a spoiler too :)
>
> yer not allowed to obscure the number plate though.

That wasn't suggested just have two plates, both valid for that
make/model/colour of vehicle. Make the "false" one more prominent that
the other and you may well be able to force the system to read that one
more often than the real one...

Mind you displaying to different but real looking two plates is probably
a very good nick nick attractor.

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Cheers                                              new5pam@howhill.com
Dave.                                             pam is missing e-mail

itcosthowmuch????? - 31 Jan 2006 08:58 GMT
the flash /pusle bright light dosent work , as most are now video

Far be it from me to suggest some thing illegal or a way of
circumventing the system  , but it would be interesting to see what the
law says on driving a 'restored ' military land rover  displaying
its mod plates ............ read my original post and think about it !
( i know it works )
Larry - 31 Jan 2006 22:01 GMT
But the microwaves would. and also a sufficiently bright light in the
background is going to cause it to overexpose, have you ever tried taking
pictures against the light ?

Signature

Larry
Series 3 rust and holes

except to someone who does not
believe in the laws of mathematics"

> the flash /pusle bright light dosent work , as most are now video
>
[quoted text clipped - 3 lines]
> its mod plates ............ read my original post and think about it !
> ( i know it works )
Larry - 30 Jan 2006 18:44 GMT
Well I am going to do a bit more thinking but I reckon there might still be
a way :)

I would reckon that in reality applying game thery and probabilities you are
going to get away most of the time unless they are actually looking for you
in particular.

Signature

Larry
Series 3 rust and holes

> So this means you can't piss them off because it will be marked for
> human inspection?
> Kind regards,
> Erik-Jan.
Dave Liquorice - 30 Jan 2006 21:59 GMT
>> For non reads , no match or  multiple matches , it is marked as
>> unreadable and past for human inspection
>
> So this means you can't piss them off because it will be marked for
> human inspection?

No but that takes time and someones wages. I doubt that all non reads etc
actually get looked at by a human, within the timescale required to send
out the fine, only a sample. If you regularly use the "trick" then
they'll start looking for you(*) but once in a blue moon...

(*) No doubt the system can also make a pretty damn good stab at vehicle
recognition as a well. Number plates alone do not in anyway identify the
vehicle, you need the make, model and colour as well.

It's all well and good insisting that the plate makers postcode is in 6pt
moulding in the plates but that isn't going to stop back street Johny
making up plates for his dubious mates. As has already been said who is
going to routinely the check that ABC Motors CF4 2GB actually exists?

Totally useless legislation but dangerously giving a sense of security.

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Cheers                                              new5pam@howhill.com
Dave.                                             pam is missing e-mail

Larry - 30 Jan 2006 18:50 GMT
H'mm let me suppose I had a very powerful strobe mounted on my roof, If I
kept flashing that every time I passed a camera they would never know I
existed at all,

As they used to say beware the hun in the sun.

Signature

Larry
Series 3 rust and holes

> For my sins I worked on the London congestion charging systems at a
> high technical level  working on all aspects of the system , I can tell
[quoted text clipped - 24 lines]
> required
> But you can make any type of sign !
Ian Rawlings - 30 Jan 2006 21:11 GMT
> H'mm let me suppose I had a very powerful strobe mounted on my roof,
> If I kept flashing that every time I passed a camera they would
> never know I existed at all,

You'd have to make one that came on for the whole time the
camera was on you rather than flashing otherwise there's a good chance
it would catch you between flashes as the strobe will spend far more
time off than on.

Signature

Blast off and strike the evil Bydo empire!

Larry - 30 Jan 2006 22:38 GMT
Have to be a suitably high frequency then either that or a microwave burst
that burns up the electronics and renders it FUBAR

(chainsaw would do just as well but more conspicuous)

Signature

Larry
Series 3 rust and holes

> You'd have to make one that came on for the whole time the
> camera was on you rather than flashing otherwise there's a good chance
> it would catch you between flashes as the strobe will spend far more
> time off than on.
 
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