[12785] in cryptography@c2.net mail archive
Re: Face-Recognition Technology Improves
daemon@ATHENA.MIT.EDU (Derek Atkins)
Sat Mar 15 12:20:38 2003
X-Original-To: cryptography@wasabisystems.com
X-Original-To: cryptography@wasabisystems.com
To: "Sidney Markowitz" <sidney@sidney.com>
Cc: <cryptography@wasabisystems.com>
From: Derek Atkins <derek@ihtfp.com>
Date: 15 Mar 2003 09:01:36 -0500
In-Reply-To: <005c01c2eaa9$e7b6e190$7901a8c0@sidora>
"Sidney Markowitz" <sidney@sidney.com> writes:
> > In addition, only one subject in 100 is falsely linked
> > to an image in the data base in the top systems.
>
> Wow, 99% accuracy for false positives! That means only a little more than
> 750000 people a year mistakenly detained for questioning in Atlanta
> HartsField Airport (ATL), and even fewer at the less busy airports (source
> Airports Council International, 10 Busiest Airports in US by Number of
> Passengers, 2001).
Were there really 750 Million Passengers flying through ATL??? That
number seems a bit high...
Also, I'm not convinced that multiple trials for a single individual
are independent. Indeed, one could easily assume that multiple trials
for a single individual are highly correlated -- if the machine isn't
going to recognize the person on the first try it's highly unliklely
it will recognize the person on subsequent tries. It's not like there
is a positive feedback mechanism.
Therefore, a better question would be how many UNIQUE passengers flew
threw ATL, and then take 1% of that for the number of false positives.
I think it's safe to assume that the 99% accuracy for false-positives
is over the population, not over the number of trials.
> -- sidney markowitz
> sidney@sidney.com
-derek
--
Derek Atkins
Computer and Internet Security Consultant
derek@ihtfp.com www.ihtfp.com
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