1. Best of Biometrics

Best of Biometrics is an operation applied by GBDS when two or more profiles are merged or linked together.

When applied, Best of Biometrics evaluates each fingerprint and palmprint template individually and selects the templates with the highest quality on each finger and/or palm position among all the merged transactions. Then, it updates the person profile to unify the “best” biometrics in a single active transaction that will be used for biometric comparison. This operation does not apply to Face and Iris templates, to which the latest images will override the older ones, regardless of the quality.

To enable Best of Biometrics, the configuration parameter gbds.biometric.best-of-biometrics.enabled must be set to true either in GBDS 4 configuration and in the GBDS API configuration.

There are two cases when Best of Biometrics is performed: When the database profiles are not deduplicated and must be linked, and when an exception occurs and the MERGE treatment is applied.

1.1. Linking Profiles

This option is a N to 1 operation. The operator can link multiple profiles in only one resulting profile. It is done through direct API calls to GBS ETR Server.

To link two profiles, the operator must first consolidate the transactions of a Profile B into Profile A. This operation will compare the transactions in Profile B and the active transaction of Profile A to get the “best biometrics” according to the rules mentioned above. Then, it will generate a new transaction with the highest quality biometrics that must be submitted as a trusted update to Profile A.

Once Profiles A and B are successfully merged, Profile B can be disabled, being no longer available for biometric comparison.

1.2. Merging Profiles

This option is a 1 to 1 operation. It can be executed when entrant profiles generate an enroll or update exception with an existing profile in ETR. If the chosen treatment for those profiles is MERGE, then the Best of Biometrics is applied if active.