Biometry: Difference between revisions

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*good (e.g. low) far
*good (e.g. low) far
*a low intensity light source is used to scan the vascular pattern
*a low intensity light source is used to scan the vascular pattern

=Other techniques=
*voice verification
*signature verification
*vein pattern scanning
*scent
*keystroke patterns

Revision as of 13:11, 15 February 2005


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