What does separability of a biometric system mean?
The Receiver Operating Characteristic (ROC) offers an objective comparison of different biometric systems, in the form of a graph. More practical would be the specification of one single measured value, which forms a kind of average of all the systems settings. Therewith, only a global description of the system would be possible. One must therefore understand that a system can be better overall, despite worse local functioning, for example in an operating point. Separability is intuitively the ability of a biometric system to differentiate authorized and unauthorized users on the basis of a biometric feature. The higher the separability, the fewer the errors while differentiating authorized and unauthorized users. The measure of the separability, like that of the ROC, cannot be dependent on implementation specific scales. Additionally, a separability measure should be easy to calculate. A well known measure for the (inverse) separability is the Equal Error Rate (EER). Unfortunately, th
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