fixitsan wrote:
I take your point about the strobing, but the first or second step in image processing is contrast enhancement and here the large white led lit area would have to be taken into account by the procccessing software....and a consequence is the reduction in visibilty of existing areas OR the led lit area is vieqwed as beeing white and then the font isn't recogniseable.
Correct, but........
fixitsan wrote:
As for the plod down the street scenario, only the mobile units will work with a mobile police unit to assist in stops. For the cameras fitted on gantry's often a colour photo is taken , for use in court, but from what I've read a colour image isn't produced unless a succesful recognition has taken place.....otherwise the system is generating evidence which has no accompanying crime.
Don’t believe everything you read, besides, that would be bad design practice. It makes more sense to setup the system to capture as much data as possible in the event of a recognition fault for later examination. The original image could then be adjusted for contrast and brightness to reveal the tell-tale greyscales.
fixitsan wrote:
Yes the led's could be detected by someone with an IR camera, but when you consider how bright the roadside IR illuminators are, a simple solution would be to fit an IR phototransistor (50pence) to somewhere inside the car looking forwards and only turn on the number plate IR led's when a strong IR flood is detected. Making it virtually undetectable at all other times.
“At all other times” doesn’t fill me with confidence
all plod need do is set up an IR enabled camera at the time which isn’t “at all other times” i.e. at an ANPR site
and watch for offenders with such IR arrays.
To be frank (but with respect), this is a respectable site concerned with road safety policy, you can’t expect the members to take ideas regarding illegal activity too seriously.