Biometry

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.

Hand geometry

• Hand is placed on a reflective surface
• Hand is lit by some light source (e.g. bright LED)
• a camera and some mirrors are used to gather images of several parts of the hand from several angles
• the template consists of measurements extracted from the image

Retina scanning

• was available before iris scanning
• good (e.g. low) far
• a low intensity light source is used to scan the vascular pattern

Other techniques

• voice verification
• signature verification
• vein pattern scanning
• scent
• keystroke patterns