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Fingerprint Scanner That Works From 6 Feet 83

Bruce Schneier found a somewhat older story that I haven't seen before about a device that is smaller than a tissue box, but uses two 1.3 megapixel cameras and a polarized light source to scan a fingerprint from two meters away.
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Fingerprint Scanner That Works From 6 Feet

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Numeric stability is probably not all that important when you're guessing.