In addition to accuracy, a biometric system has additional factors that determine its effectiveness.
Which one of the following listed items is NOT one of these additional factors?

A.
Corpus

B.
Throughput rate

C.
Enrollment time

D.
Acceptability

Explanation:
A corpus is a biometric term that refers to collected biometric images. The corpus is stored in a
database of images. Potential sources of error are the corruption of images during collection and
mislabeling or other transcription problems associated with the database. Therefore, the image
collection, process and storage must be performed carefully with constant checking. These images
are collected during the enrollment process and thus, are critical to the correct operation of the

biometric device. In enrollment, images are collected and features are extracted, but no comparison
occurs. The information is stored for use in future comparison steps. Answer a, the throughput rate,
refers to the rate at which individuals, once enrolled, can be processed by a biometric system. If an
individual is being authenticated, the biometric system will take a sample of the individual’s
characteristic to be evaluated and compare it to a template. A metric called distance is used to
determine if the sample matches the template. Distance is the difference between the quantitative
measure of the sample and the template. If the distance falls within a threshold value, a match is
declared. If not, there is no match. * Answer “acceptability” is determined by privacy issues,
invasiveness, and psychological and physical comfort when using the biometric system. *”Enrollment
time” is the time it takes to initially register with a system by providing samples of the biometric
characteristic to be evaluated.