Encyclopedia of Biometrics

2009 Edition
| Editors: Stan Z. Li, Anil Jain

Fingerprint, Palmprint, Handprint and Soleprint Sensor

  • Geppy Parziale
Reference work entry
DOI: https://doi.org/10.1007/978-0-387-73003-5_12



A fingerprint or palmprint or handprint or soleprint sensor is a transducer that converts the ridge–valley structure of a person’s hand or foot sole to an electrical signal. Generally, the sensor reads the difference of pressure, temperature, light, electrical capacity or other kinds of energies are measured between the ridges and the valleys. Then, this difference is converted into an electrical digital signal that is encoded as an image representing the ridge–valley pattern. Different technologies can be applied to achieve this conversion and each of them brings advantages and disadvantages.

It is important to highlight that the output signal is a representation of the real-world ridge–valley pattern. Hence, if F is a ridge–valley pattern of a real-world finger tip and s is the transfer function of a device, the output signal is F ′ = ...

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© Springer Science+Business Media, LLC 2009

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  • Geppy Parziale

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