.. _terms:

=====================
Terms and Definitions
=====================

For the purpose of this document, the following terms and definitions apply.

**Algorithm**
    A sequence of instructions that tell a biometric system how to solve a particular problem. An algorithm will have a finite number of steps and is typically used by the biometric engine (i.e. the biometric system software) to compute whether a biometric sample and template match. 

**Biometric data**
    Data encoding a feature or features used in biometric verification. 

**Comparison**
    The process of comparing a biometric sample with a previously stored reference template or templates. 

**Comparison score**
    Numerical value resulting from a comparison. 

**Enrollment**
    The process of collecting biometric samples from a person and the subsequent preparation and storage of biometric reference templates representing that person's identity. 

**Extraction**
    The process of converting a captured biometric sample into biometric data so that it can be compared to a reference template; sometimes called 'characterization'. 

**False match**
    Comparison decision of 'match' for a biometric probe and a biometric reference that are from different biometric capture subjects. 

**False match rate**
        Expected probability that a captured biometric sample will be falsely declared to match to a single, randomly-selected, non-self biometric reference. 

**False non-match**
    Comparison decision of 'non-match' for a biometric probe and a biometric reference that are from the same biometric capture subject and of the same biometric characteristic. 

**False non-match rate**
    Proportion of the completed biometric mated comparison trials that result in a false non-match. 

**Match / Matching**
    The process of comparing a biometric sample against a previously stored template and scoring the level of similarity. 

**One-to-many search**
    Process in which a biometric probe of one biometric data subject is searched against the biometric references of more than one biometric data subject to return a candidate list or a comparison decision. 

**One-to-one comparison**
    Process in which a biometric probe from one biometric data subject is compared to a biometric reference from one biometric data subject to produce a comparison score. 

**Template / Reference template**
    Data, which represents the biometric measurement of an enrollee, used by a biometric system for comparison against subsequently submitted biometric samples.

    NOTE - this term is not restricted to mean only data used in any particular recognition method, such as template matching. 


Abbreviated Terms
=================

For the purpose of this document, the following abbreviations apply.

.. list-table:: 
    :width: 100%
    :widths: 30 70

    * - API    
      - Application Programming Interface
    * - ANSI   
      - American National Standards Institute
    * - GPU    
      - Graphical Processing Unit
    * - ICAO   
      - International Civil Aviation Organization
    * - IOD	   
      - Interocular distance
    * - ISO	   
      - International Organization for Standardization
    * - NIST   
      - National Institute of Standards And Technology
    * - ONVIF  
      - Open Network Video Interface Forum
    * - PAD    
      - Presentation attack detection
    * - SDK    
      - Software Development Kit

