CBP CBP Biometric Performance Evaluation and Testing 1

Question 1

What does FMR (False Match Rate) measure in a biometric system?

Accepted Answer

The rate at which impostors are incorrectly accepted as genuine

Answer

FMR (False Match Rate), also known as False Accept Rate (FAR), measures the frequency at which an impostor's biometric sample is incorrectly matched to another person's enrolled template.

Question 2

What is the FNMR (False Non-Match Rate) in biometric system evaluation?

Accepted Answer

The probability that a genuine user's sample fails to match their enrolled template

Answer

FNMR (False Non-Match Rate) is the probability that a genuine user's presented biometric sample fails to match their stored template, causing a false rejection.

Question 3

On an ROC (Receiver Operating Characteristic) curve for a biometric system, what trade-off is being visualized?

Accepted Answer

FMR vs. FNMR across different decision thresholds

Answer

A biometric ROC curve plots FMR against FNMR (or 1-FNMR) at varying decision thresholds, showing the trade-off between security and user convenience.

Question 4

The Equal Error Rate (EER) is the point on the ROC curve where:

Accepted Answer

FMR equals FNMR

Answer

The Equal Error Rate (EER) is the operating point where FMR equals FNMR, and is commonly used as a single-figure summary of biometric system accuracy.

Question 5

What does the 'Failure to Enroll' (FTE) rate measure?

Accepted Answer

The proportion of individuals whose biometric samples cannot be successfully enrolled

Answer

FTE (Failure to Enroll) rate measures the proportion of users for whom the system cannot create a usable biometric template during the enrollment process.

(CBP) Certified Biometrics Professional Practice Test

(CBP) Certified Biometrics Professional Practice Test

CBP CBP Biometric Performance Evaluation and Testing 1