Page 271 - Automated Fingerprint Identification Systems (AFIS)

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prints and selects the file print that comes closest to matching the search
print. It will also perform a minutia verification match.
FINGERPRINT MINUTIAE MATCHER ACCURACY—(a) A measure of the
matcher subsystem’s ability to identify the correct candidate as a result of
the matching process or to select no candidate if the mate is not in the file
print database being searched. (b) The closeness of agreement between the
matcher subsystem’s generated representation of a fingerprint compared
with the fingerprint it represents.
FINGERPRINT MINUTIAE MATCHER RELIABILITY—(a) The probability
that the mating fingerprint will be selected as the primary candidate by the
matcher subsystem if that mate is in the file prints being searched, or that
no candidate will be selected if the mate is not in the file prints being
searched. (b) The probability that an entity will perform its intended func-
tions for a specified interval under stated conditions.
FINGERPRINT MINUTIAE MATCHER SELECTIVITY—The function of select-
ing the candidate, both correct and incorrect, and its relationship to other
close candidates based upon minutiae scoring algorithms within the matcher
subsystem.
FINGERPRINT PLAIN IMPRESSIONS—Fingerprint impressions taken by
simultaneously capturing all of the fingers of each hand and then the thumbs
without rolling, using a pressed or flat-impression.
FINGERPRINT REPOSITORY—A term for the AFIS/FBI capability to store
fingerprint characteristics data and perform database-like functions, such as
storage retrieval, search, and update. The AFIS/FBI segment has at least
three subcategories of repository. (1) The FBI criminal repository contains
one entry for each subject meeting retention criteria. The data included are
extracted from criminal tenprint submissions. At a minimum, the FBI crim-
inal repository contains fingerprint characteristics for all ten fingers. (2) The
unsolved latent repository contains single latent fingerprints not identified
to any subject in the criminal fingerprint repository. It is used to provide leads
for unsolved criminal cases. (3) The special repositories have separately
defined uses and data. Each has its own sponsor who controls its use. The
data in each repository may be used for either tenprint and latent fingerprint
searching, or for specially defined fingerprint searching.
FINGERPRINT ROLLED IMPRESSIONS—The impressions created by indi-
vidually rolling each inked finger from side to side in order to obtain all avail-
able ridge detail.
FLATS—Fingerprint plain impressions.
FRICTION RIDGE—The ridge-shaped skin on a finger or palm surface that
makes contact with an object.
GRAYSCALE IMAGE—An image using more than two radiometric values, i.e.,
256 shades of gray in an eight-bit image. Not a strictly black and white image.