Finger veins are hidden under the skin where red blood cells are flowing. In biometrics, the term vein does not entirely correspond to the terminology of medical science. Its network patterns are used for authenticating the identity of a person, in which the approximately 0.3–1.0 mm thick vein is visible by near infrared rays. In this definition, the term finger includes not only index, middle, ring, and little fingers, but also the thumb.
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