"Sidney Markowitz" <[EMAIL PROTECTED]> 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 > [EMAIL PROTECTED] -derek -- Derek Atkins Computer and Internet Security Consultant [EMAIL PROTECTED] www.ihtfp.com --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]