Hands, by themselves, are not descriptive enough so as to result in positive identification. This form of biometry therefore, takes into consideration a combination of various factors such as size, shape, finger length and thickness, and other such details.
Hand geometry as a biometry is usually used in places where fingerprinting could be considered intrusive. With regards to its effectiveness, it needs to be mentioned that a fairly good sample can be obtained for verification if the biometric device takes enough criteria into the reckoning.
Certain devices can also measure hands from a three dimensional perspective to arrive at a much more accurate sample. Additionally, hand geometry can be easily combined with, say, fingerprinting, for better results.
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