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Fingerprint recognition systems use the non-changing specs of the finger prints. Fingerprints have been used at the 19th century for national security reasons for the first time.Its history made it the most known biometric technology.
A fingerprint is made of bumps and cavities. This formation is categorised in 5 levels. Shapes called "core" or "delta" are used. The coordinates of these points are scaled on the X-Y axis during the analysis.
 Like in all other biometric technologies, registering is the first step in fingerprint systems. The user must register his/her fingerprint then rescan the finger to use for any purpose.
Different fingerprint components are available with different technologies which are optic, capasitif and thermal. Images taken with these components are examined in details. Even if the "degrees of freedom" (DOF) of the fingerprint are less than the iris', they are enough for applications. All the bad scars on the picture are tried to be erased. Bad skin iameges are tried to be repaied, this is called "image enhancement" After a few images taken, the fingerprint becomes a detailed, and ready to work on.
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