Questions · Access control
Fingerprint, face or palm: which one works best where?
They work well in different places and they fail for different reasons. The fingerprint is the most widespread and the cheapest, it needs contact and it fails with hands that are wet, dirty, covered in cream, gloved or simply very worn, which is exactly the profile of a lot of factory and site workers.
The face needs no contact and it is quick, but it depends on the light: a window backlighting the reader at six in the evening, or a reader fitted outdoors with no hood, cause more trouble than anything else. It is also the one most readily read as surveillance, and that counts with a works council. The palm, reading the vein pattern, needs no contact, leaves no latent trace and copes well with worn hands; the equipment is less common and dearer.
And there is one figure that in practice decides more than accuracy: the time per person. On a door where a whole shift comes in over a few minutes, one extra second per read is a queue out in the street. There are places where biometrics does not fail on accuracy, it fails on the queue, and that is worked out before choosing the reader.
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