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How it works
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Biometric sample - The
identifiable, unprocessed image or recording of a physiological or
behavioral characteristic, acquired during submission, used to
generate biometric templates. Also referred to as biometric data.
The following sample types are associated with each biometric
technology:
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Technology
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Biometric Sample
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Fingerprint
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Fingerprint image
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Voice recognition
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Voice recording
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Facial recognition
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Facial Image
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Iris-scan |
Iris Image |
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Retina-scan
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Retina Image
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Hand geometry
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3-D image of top and sides of
hand and fingers |
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Signature-scan
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Image of signature and record
of related dynamics measurements |
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Keystroke-scan
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Recording of characters typed
and record of related dynamics measurements
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Feature extraction - The automated
process of locating and encoding distinctive characteristics from a
biometric sample in order to generate a template. The feature
extraction process may include various degrees of image or sample
processing in order to locate a sufficient amount of accurate data.
For example, voice recognition technologies can filter out certain
frequencies and patterns, and fingerprint technologies can thin the
ridges present in a fingerprint image to the width of a single
pixel. Furthermore, if the sample provided is inadequate to perform
feature extraction, the biometric system will generally instruct the
user to provide another sample, often with some type of advice or
feedback.
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