What is False Rejection Rate (FRR)?

What is False Rejection Rate (FRR)?

False rejection rate (FRR) is a measure used in biometric authentication systems to quantify the rate at which legitimate users are denied access due to the system incorrectly rejecting their biometric data. FRR is also known as type II error or false non-match rate.

FRR is calculated by dividing the number of falsely rejected attempts by the total number of attempts. This metric is important as it directly impacts the user experience and can lead to frustration and inconvenience if the biometric system frequently rejects legitimate users.

A high FRR can be caused by various factors such as low-quality biometric data, user variations in presenting their biometric data, or system malfunctions. To reduce the FRR, biometric authentication systems can be adjusted to allow for a wider range of variations in the biometric data, or additional authentication factors can be added to the system to provide backup authentication methods in case of a biometric rejection.

Back