On Wednesday, 6 June 2018 19:58:52 UTC+1, Cynic wrote:
ANPR cameras can be hired, eg
although the cost may be more than buying one. Many police forces or councils have raplid-deployment relocatable CCTV cameras. Possibly if you involve local police liaison or councillors you might get them to put one near the hall for a while.
Or if you have a local security business with one they might give you a free loan.
Otherwise if volunteers can remotely access the cameras and keep an eye, on a rota, and call the police when something is happening, you may get a result.
On Thu, 7 Jun 2018 00:30:04 -0700 (PDT), firstname.lastname@example.org
If the Poilce density where the OP is is anything like ours (at any
one time around three officers inc PCSO's) for 100 square miles ish)
even if they aren't involved in something else by the time they've
arrived the boy racers will have moved on.
And as Mr Wright says getting a CCTV system that has the abilty to
render number plates at night isn't easy. He misses out the the glare
from head/tail/brake lights...
So if you have people able to keep an eye on the CCTV remotely, then
wandering around when "activity" is spotted and using the Mk1 eyeball
to get numbers, make, model and colour of the cars and passing that
to the Police may be more effective. Even better if there are CCTV
recordings that are good enough to show at least make/model if not
colour (apart from "light" or "dark") and plates.
Wildlife/trail/ trap cameras are a nice self contained package.
Some models can send images over the cellphone network though often at
lower resolution than the one stored on the on board memory card.
Most have an option to record a sequence of stills and/or some video.
Others have low visibility black IR illuminators so they are hard to spot
compared to the usual red glow which can be observed.
Some councils set them up in known flytipping spots hidden a tree etc so
presumably some models collect a good enough image of numberplates to be
Prices range from about £40 for a basic one to around £500 for something at
the top end.
I have to say the one from Lidl a few weeks back though basic and with
normal IR illuminators produces very good images for its around £80 cost
that stand comparison to the more expensive Little Acorn I also have.
The industrial estate where I used to have my factories had a
professionally installed CCTV setup around the main gate. The whole area
was well lit by column lamps, to give good colour images day or night.
There were two general view cameras, giving distance shots in both
directions. There were two cameras giving closer views of vehicles and,
with luck, their drivers on entering and leaving.
The fifth camera recorded the number plates of vehicles entering. It was
not ANPR, simply recording an image that could be retrieved later, if
required. It had lots of problems until they fitted it with IR emitters
and a narrow pass filter, matched to the frequency of the emitters. It
was still never completely successful, but probably worked about 70% of
the time. One result of the filter was that it only showed the
numberplate on a black background, with no details of the vehicle. That
had to be identified from one of the other cameras. I don't recall the
police ever using any of the CCTV images in evidence, although they did
sometimes view them if there was a break in on the estate.
That's given some useful ideas. We may be replacing a broken off gatepost s
oon. A bit of heavy gauge box section with an artistic cap might be able to
include a covert camera plus a motion sense light off axis to the camera s
o no reflected glare. The light would give a reason to cut a trench for an
armored supply cable. The trench could also contain a bit of cat 5 in a duc
t to serve the camera.
Since my first post I learned this evening the hall in the next village had
a similar problem and installed high speed bumps which the boy racers lowe
red suspension cars cannot cope with.
We'll probably try that first 😁
I'd have a look at the Hikvision range of cameras, bought one to
evaluate recently been very impressed with it for 80 odd quid. I believe
they do a ANPR one and or the recorder that goes with it etc..
Have a look on Youtube, several demo examples on there..
Don't be tempted to overdo it. The DfT recommendation is that individual
speed bumps should not be higher than 75mm, to avoid possible damage to
If the car park is suitable, breaking it up into separate parking areas
with parking kerbs will deny them the open flat area they want.
I've just been down to the hall in the next village to look at speed bumps
they installed. The 75mm variant is what they have and the lowered suspensi
on cars were seen arriving, trying to enter then going away (probably to ou
r more accessible car park). Seems worth trying as a non technical method.
A 3 metre strip across the entrance is available as a kit on eBay.
Its just a case of getting the exposure correct.
To do so may be impossible with some cameras.
The best way is with manual control so you park a car there and set the
exposure so you can read the plate.
Of course this means the rest of the field of view will be pitch black
which is why multiple cameras are used.
You could try moving the IR source away from the camera so it doesn't
reflect straight back but watch the shadows as they will lose detail.
If the IR illumination and camera were perpendicular to the number plate
I would agree, but that would be unlikely. The only other issue is with
snow/rain/fog where there is significant local reflection.
The contrast between white and black on a number plate is significant,
it really is a question of getting the right illumination and correct
Some illegal number plates try and filter the IR wavelengths to reduce
the contrast, but they are still readable in the visible.
I might be more tempted to use white or yellow illumination, which would
also act as a deterrent.
For Cynic's purposes the solution might likely to be more than one
camera. One with exposure specifically to capture the number plate, and
another to see what was going on.
There are cameras than can cope with a huge dynamic range, but they're
Which is the point of retroflective number plates. AIUI, the problem is
avoiding other light sources from reflecting off the outer face of the
plate. That is why they fitted a filter matched to the wavelength of the
IR emitters to the number plate camera on my industrial estate.
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