Reference Work Entry

Encyclopedia of Biometrics

pp 778-782


Fusion, User-Specific

  • Julian FierrezAffiliated withUniversidad Autonoma de Madrid
  • , Javier Ortega-GarciaAffiliated withATVS – Biometric Recognition Group, Escuela Politecnica Superior, Universidad Autonoma de Madrid


Adapted fusion; Local fusion; Target-dependent fusion; User-dependent fusion


User-specific fusion in the framework of biometrics, initially devised for score fusion in the verification mode, refers to techniques used for information fusion in which there is a specific fusion function for each user enrolled in the system. These fusion functions are retrieved and used for information integration in the same way the enrolled templates corresponding to the claimed identities are retrieved and used for matching.

User-specific fusion techniques find application in several biometric fusion scenarios, e.g., multimodal fusion, where some subjects may be not adequate for recognition based on specific modalities (these evidences can be ignored or given less importance in the information fusion step), or multi-algorithm fusion, where some subjects may be better recognized based on particular algorithms (their fusion functions can be adapted to give more importance to those algorith ...

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