Is a biometric systems performance dependent upon the user?
Generally, yes. This applies for false acceptance rate (FAR) as well as for false rejection rate (FRR). We experience this in our everyday lives — some faces are easy to recognize and remember, whereas others are difficult. Therefore, the statistical means of FAR and FRR, typical indicators, are not very helpful for individual users. This dependence on the individual user is also responsible for the fact that statistical properties of FAR and FRR measurements are very difficult to quantify.
