CBP Biometric Performance Metrics and Testing Flashcards

What does the False Acceptance Rate (FAR) measure in a biometric system?

Answer: The rate at which imposters are incorrectly accepted

FAR measures the frequency with which unauthorized individuals are incorrectly accepted by the biometric system.

What does the False Rejection Rate (FRR) indicate in biometric performance evaluation?

Answer: The percentage of legitimate users incorrectly denied access

FRR is the rate at which genuine users are incorrectly rejected, directly impacting user convenience and system usability.

The Equal Error Rate (EER) is the point at which:

Answer: FAR and FRR are equal

The EER is the threshold point where the False Acceptance Rate and False Rejection Rate are equal, commonly used to compare system accuracy.

Which metric specifically measures a biometric system's ability to correctly identify enrolled users across a database?

Answer: Identification Rate (Rank-1)

The Rank-1 Identification Rate measures the probability that the correct identity appears as the top match in a 1-to-many search.

What is the Failure to Enroll Rate (FTE) in biometrics?

Answer: The rate at which individuals cannot be enrolled due to insufficient biometric quality

FTE represents the proportion of users whose biometric samples do not meet minimum quality standards for enrollment.

In a Receiver Operating Characteristic (ROC) curve for biometrics, what do the axes typically represent?

Answer: FAR on X-axis and FRR on Y-axis

A biometric ROC curve plots FAR on the X-axis against the True Acceptance Rate (1-FRR) on the Y-axis to show the accuracy trade-off across thresholds.