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luizgh / sigver

Signature verification package, for learning representations from signature data, training user-dependent classifiers.
BSD 3-Clause "New" or "Revised" License
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Thresholds #23

Open prakharg01 opened 2 years ago

prakharg01 commented 2 years ago

How exactly is the global and user threshold calculated? given the SVM decision function, do we use user-specific threshold for calculating probabilities?

luizgh commented 2 years ago

Hi @prakharg01- in our papers, the EER reported considers the optimal threshold (i.e. optimizing the threshold that minimizes EER in the test set). This allows us to compare different feature sets, but in practice the thresholds must be computed before hand (e.g. with a validation set), which we did not investigate in the papers - with the exception of the FAR and FRR results, that were indeed obtained with a (global) threshold defined in the validation set.