Definition
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.
Introduction
Blood vessels are not exposed and their network patterns are normally impossible to see without the range of visible light wavelength. The approximately 0.3–1.0 mm vein which constitutes the network patterns is visualized by near-infrared rays. Figure 1shows a visualized finger vein pattern image. It is well known that hemoglobin absorbs near-infrared rays more than other substances that comprise the human body. Since most of the hemoglobin of human body exists in red blood cells that are flowing inside blood vessels, the...
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References
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Himaga, H.O.M. (2015). Finger Vein. In: Li, S.Z., Jain, A.K. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7488-4_128
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DOI: https://doi.org/10.1007/978-1-4899-7488-4_128
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