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Re: (Fwd) British Study Claims That Photo Credit Cards Don't Work
At 11:10 AM 4/9/96, jim bell wrote:
>At 07:57 AM 4/9/96 -0500, Mike McNally wrote:
>>[email protected] wrote:
>
>>There are supposedly some new techniques that look at the infrared
>>signature of your face (like, I guess, distribution & position of
>>hot & cold spots), and that's less likely to be fooled by facial
>>hair and other superficial disguises. It's probably a fairly simple
>>technology, and could be applied to the credit card ID problem.
>
>I think this is based on looking at your face with near-infrared, not the
>medium and far (thermal) infrared. Near infrared is supposed to penetrate
>flesh far better, so your blood vessels are visible and form a pattern
>which can be recognized.
>
>Jim Bell
>[email protected]
Jim,
Where did you get your info? Near IR is around 1-1.5 microns, at these
wavelengths, the body radiates very little energy. I think most of the
systems you are discussing use mid (3-5) or long-wave (8-12) IR, where
objects that are room to body temp radiate most of their energy.
Clay
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Clay Olbon II | [email protected]
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