# Commission Implementing Decision (EU) 2019/329 of 25 February 2019 laying down the specifications for the quality, resolution and use of fingerprints and facial image for biometric verification and identification in the Entry/Exit System (EES), Division 1.3.3: Measurement of the biometric accuracy for verification (False Matching Rate and False Non Matching Rate)

Extent: E+W+S+N.I.

The measurement process shall apply the following logic:
1.. A person to whom the EES applies submits a sample of one of the two biometric modalities.
2.. The biometric verification is conducted with the biometric reference data corresponding with the identity of the person (step 1 of the figure called ‘default verification’).
Steps 1 and 2 belong to the identity verification process that is part of the EES. The measurement of the biometric accuracy starts from here.
3.. The verification of the biometric sample is executed vs a number of other biometric samples randomly taken from the biometric gallery which do not include the biometrics provided. The expected result is that the verifications will fail (this refers to point 2 of the figure ‘verifications known to be non-mated’). Any match would mean a false match.
Step 3 allows the calculation of the False Matching Rate (the match occurs with another person than the owner of the data):
FMR = Number successful non mated comparisons Number of non mated comparisons Step 2 allows the calculation of the False Non Matching Rate (the match does not occur with the owner of the biometrics), in the case the identity has been confirmed by other means, on the basis of
FNMR = Number of failed comparisons Number of assumed mated comparisons

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Source: https://www.legislation.gov.uk/eudn/2019/329/annex/division/1/division/1.3/division/1.3.3 (the official version)
Page: https://openlegislation.uk/eu-decision-2019-329/annex/division-1/division-1.3/division-1.3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.