CBP CBP Biometric Performance Evaluation and Testing

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

The rate at which genuine users are rejected

Answer

The rate at which the sensor fails to capture a sample

Answer

The rate at which templates fail to enroll

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

The probability that an impostor is accepted

Answer

The rate of sensor hardware failures

Answer

The proportion of users who cannot enroll

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

Enrollment time vs. matching speed

Answer

Template size vs. storage cost

Answer

Sensor resolution vs. matching accuracy

Question 4

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

Accepted Answer

FMR equals FNMR

Answer

Throughput equals enrollment speed

Answer

The system achieves 99% accuracy

Answer

False rejects equal the number of enrollments

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

The proportion of enrolled users who forget their PIN

Answer

The number of times a system reboots during enrollment

Answer

The rate at which templates expire and must be re-enrolled

Question 6

In biometric testing, what is a 'technology evaluation' as opposed to an 'operational evaluation'?

Accepted Answer

Technology evaluation tests algorithms on archived data; operational evaluation tests complete systems in real deployment conditions

Answer

Technology evaluation tests hardware; operational evaluation tests software

Answer

Technology evaluation is done by vendors; operational evaluation is done by regulators

Answer

Technology evaluation measures speed; operational evaluation measures accuracy