Biometry

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Overview

  • Broad Overview on Biometric Criteria
  • Facial recognition
    • Use, Scenario, Features
    • General course
    • Approaches
    • Summary
  • Insights on Fingerprints
    • Features
    • Acquisition
    • Recognition
    • Demonstration
    • Problems

Short Introduction

  • I biometry: the statistical analysis of biological

observations and phenomena (Merriam-Webster Online Dictionary)

  • I biometric: a measurable, physical characteristic or

personal behavioral trait used to recognize the identity, or verify the claimed identity of a person

  • I Three levels:
    • 1. I know something (passwords)
    • 2. I have something (tokens)
    • 3. I am something (biometry)

Classification

Two diffent modes must be distinguished:

  • Identification “Who is it?”
  • Authentication “Is it her?”

Quality indices

  • False Rejection Rate (frr)
    • Rate of authentication

attempts from legitimate users that are rejected.

  • False Acceptance Rate (far)
    • Rate of authentication

attemps from illegitimate users (e.g. attackers) that are accepted.

  • Equal Error Rate (eer)
    • The eer equals the far

and frr when the system is configured so that far = frr.

  • Failure to Enroll Rate (fer)
    • Rate of users that can’t

enroll into the system at all.