What needs to be considered in the definition of FAR?
Similar to the FRR, the false acceptance rate can be defined differently. • The FAR is a statistical value, whose measurement accuracy depends on the number of measurements. The FAR depends not only on the biometric system, but on the user as well. There is also a personal FAR. If one wants to deal with large numbers of people, it is important that one individual does not negatively affect the end result. Such could occur when the number of attempts per person differs. This problem can be avoided, if one first identifies each personal FAR curve and calculates the mean from those (or uses the median, but this provides different values!). In determining FAR, it is generally easier to limit the number of recognition attempts to 1 per person. Further attempts per person will smooth out the ROC graph, but add little to the statistical significance. • If the biometric system has picture quality management, which happens to reject a false user due to poor picture quality (click here for examp
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