Identification (1:N)
Definition
Searching a fresh sample against EVERY template in the database to find a match. Used by AFIS to hit a chance print against the criminal record store.
- Search type
- One-to-many (fresh sample vs entire database)
- Contrast
- 1:1 verification checks against a single claimed template
- Typical use
- AFIS latent print search against criminal record store
- Output
- Ranked candidate list, not an automatic match
- Speed factor
- Scales with database size, unlike 1:1 verification
Common questions
Does a 1:N search return a final identification on its own?+
No. AFIS returns a ranked candidate list based on algorithmic similarity scores. A human latent print examiner still has to compare the candidates individually and confirm or reject the match before it counts as an identification.
Why is 1:N search slower or costlier than 1:1 verification?+
A 1:1 check compares the sample to one stored template, so cost stays constant. A 1:N search compares it against every enrolled template in the database, so both search time and the chance of a false candidate rise as the database grows.
Related terms
- Behavioural Biometric
- Trait rooted in learned action: voice, gait, signature dynamics, keystroke dynamics, mouse movement.
- Biometric
- Any measurable physiological or behavioural trait used to identify or verify an individual. Falls in the 'something you are' authentication category, distinct...
- Enrolment
- First-time capture of a biometric, feature extraction, and storage of the resulting template in the system database.
- FAR / FRR / EER
- False Acceptance Rate (imposter wrongly accepted), False Rejection Rate (genuine user wrongly rejected), and Equal Error Rate (operating point where FAR =...
- Physiological Biometric
- Trait rooted in body structure: fingerprint, iris, retina, face, palm print, palm vein, hand geometry, ear shape, DNA.
- Presentation Attack Detection (PAD)
- Liveness checks that block spoofing with fake fingers, photos, iris printouts or cloned voice. Evaluated under ISO/IEC 30107.
- Verification (1:1)
- Matching a fresh sample against ONE stored template tied to a claimed identity. Used to unlock a phone or authenticate a payment.