Tenprint Fingerprint Certification Tenprint Fingerprint Technology & Automated Systems (AFIS) 2

Question 1

What is the purpose of a 'matcher score' or 'similarity score' in AFIS?

Accepted Answer

It quantifies how similar two fingerprint impressions are for ranking candidates

Answer

A similarity score ranks how closely two fingerprint impressions align algorithmically, helping examiners prioritize candidates for review.

Question 2

What is a 'false non-match' (FNM) in AFIS performance measurement?

Accepted Answer

When AFIS fails to return the correct mate in the candidate list for a genuine match

Answer

A false non-match occurs when AFIS fails to rank the true matching record high enough on the candidate list for a genuine same-finger pair.

Question 3

What is a 'false match' (FM) or 'false positive' in AFIS?

Accepted Answer

When AFIS ranks an incorrect candidate as the top match for a genuine submission

Answer

A false match (false positive) occurs when AFIS incorrectly ranks a non-matching record at the top of the candidate list.

Question 4

What technology do most modern live-scan devices use to capture fingerprint images?

Accepted Answer

Optical frustrated total internal reflection (FTIR)

Answer

Most live-scan devices use optical FTIR sensors where ridges contact the prism surface and break total internal reflection, creating an image.

Question 5

In AFIS, what is a 'duplicate check'?

Accepted Answer

Searching the database to determine if a subject is already enrolled under a different identity

Answer

A duplicate check searches the AFIS database to detect whether the same biometric identity exists under a different name or identifier.

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