How to interpet matching results

The result generated by face_sdk::matcher is -log10(FAR), which is a real number between 0 and 20, like:

where,
0 - not the same person.
20 - definitely the same person.
from 0 to 2 - very high probability of different persons.
from 2 to 5 - "grey area". The choice of the threshold depends on the size of the database and quality of the images.
from 5 to 20 - very high probability of the same person.

Important! All thresholds are not universal and highly depend on the data you use, so all your chosen threshold should be tested and proved on practice.

Matching table codes

The matching code table is the translation table between "raw FIRs difference" and FAR (false acceptance rate).
Matching table code is selected during initialization of the face_sdk::fir_matcher object.
Matching tables codes can be universal and customized for a specific enrolment database.
Universal Matching table code is "gn".
Matching code table can agreed personally.
Contact us, if you need further details.

Reference