Buckinghamshire CC ANPR cameras
ukcrypto at sourcetagged.ian.co.uk
Sat Jan 7 02:31:07 GMT 2012
On 6 Jan 2012, at 17:03, Ben Laurie wrote:
> On Fri, Jan 6, 2012 at 4:48 PM, John Wilson <tugwilson at gmail.com>
>> Is there a standard "depersonalisation" algorithm? If so anybody know
>> what it is?
> No. Indeed, in general, it is not possible to "depersonalise" and
> retain any usefulness in the data.
> So step 1 is probably to find out WTF they're actually doing.
It depends. If they are strictly monitoring traffic flows and journey
times then all they have to do is assign a unique journey number to a
set of records for a vehicle and drop/delete the registration number
when the journey seems complete. Each time the vehicle starts a
journey it gets assigned a new unique journey number so that there's
no link with previous journeys for the same vehicle and no record of
the registration number at all once a journey has completed. Obviously
there's detail to work through such as: a vehicle enters the area, is
seen by ANPR on entry, then parks up for several days and isn't seen
by a second ANPR camera; at what point do you delete the partial
journey record that will, of necessity, still contain a registration
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