Abstract: A tagging system for similarity-based retrieval operations is disclosed. A biometric system configured with the tagging system according to the aspects of the present disclosure receives biometric signatures into a gallery for enrollment in system. One or more logical tags are then associated to each known biometric signature within the gallery. When a desired functionality for the biometric system is determined, a combination of logical tags that define the desired functionality are used to generate a search space. The search space includes a subset of all biometric signatures of the gallery having the corresponding combination of logical tags. The biometric system may then compare a test image probe against each of the biometric signatures of the search space.

Abstract: A rank-based score normalization framework that partitions matching scores into subsets and normalize each subset independently. Methods include implementing two versions of the framework: (i) using gallery-based information (i.e., gallery versus galleryscores), and (ii) updating available information in an online fashion. The methods improve the detection and identification rate from 20:90% up to 35:77% for Z-score and from 25:47% up to 30:29% for W-score.

Abstract: A rank-based score normalization framework that partitions matching scores into subsets and normalize each subset independently. Methods include implementing two versions of the framework: (i) using gallery-based information (i.e., gallery versus galleryscores), and (ii) updating available information in an online fashion. The methods improve the detection and identification rate from 20:90% up to 35:77% for Z-score and from 25:47% up to 30:29% for W-score.