Hand Biometrics

1. Hand Biometrics Measurement and biometric technologies for identification and security applications

2. Objectives 2 Hand Biometrics Learn about biometrics technology Learn about engineering product planning and design Learn about meeting the needs of society Learn about teamwork and working in groups

3. What is a biometric? 3 Hand Biometrics • Measurement of a physical characteristic • Examples include: • Fingerprints • DNA • Retinal pattern • Hand dimensions

4. Properties of a biometric 4 Hand Biometrics Universality – each person should have the characteristic. Uniqueness – how well a biometric separates individuals from others. Permanence – how well a biometric resists aging, variance over time. Collectability – ease of acquisition, measurement. Performance – accuracy, speed, and robustness of technology used. Acceptability – degree of approval of a technology. Circumvention – ease of use of a substitute.

5. Why use a biometric? 5 Hand Biometrics • Biometrics are used to match an unknown sample to a database of known samples • Criminal investigations • Biometrics are used to authenticate identities • Fingerprint computer login

6. Your Turn 6 Hand Biometrics • Create a database of 4 known samples from measurements of your hands • Develop a rule or algorithm by which you can: • …accept an unknown sample and match it to an entry in your database; or • …reject the unknown sample as not appearing in the database at all

7. Procedure – Part 1 7 Hand Biometrics Database Sample A___ B___ C___ D___ Testing Sample A___ B___ C___ D___ • Work in groups of 4 • Each person gets their hand measured 2 times • You measure your own right hand • Another teammate measuresyour right hand • 1 “Testing” sample, 1 “Database” sample • DO NOT SWAP FORMS!

8. 8 Hand Biometrics Measurement A:Distance from index fingertip to bottom knuckle Measuring a hand

9. 9 Hand Biometrics Measurement B: Width of ring finger, measured across the top knuckle Measuring a hand

10. 10 Hand Biometrics Measurement C: Width of palm across 4 bottom knuckles Measuring a hand

11. 11 Hand Biometrics Measurement D: Width of palm from middle knuckle of thumb across hand Measuring a hand

12. 12 Measurement B: Width of ring finger, measured across the top knuckle Measurement A:Distance from index fingertip to bottom knuckle B A C Measurement D: Width of palm from middle knuckle of thumb across hand Measurement C: Width of palm across 4 bottom knuckles D

13. Procedure – Part 2 13 Hand Biometrics Database Sample A___ B___ C___ D___ Database Sample A___ B___ C___ D___ Database Sample A___ B___ C___ D___ Database Sample A___ B___ C___ D___ Set aside all 4 white “Testing” forms Looking at just the 4 pink Database samples, develop a mathematical and/or logical rule that can be used to match an unknown sample to an entry in the “Database”

14. Example Rule 14 Hand Biometrics Database Sample A___ B___ C___ D___ Compute Sn for each entry in “Database” Compute S for unknown test sample Choose Database sample with least error < 0.5 cm, Else state “No Match” S1 = 22.1cm Testing Sample A___ B___ C___ D___ Database Sample A___ B___ C___ D___ S2 = 25.3cm Database Sample A___ B___ C___ D___ S3 = 20.5cm S = 24.7cm Database Sample A___ B___ C___ D___ S4 = 24.9cm Error = 0.2cm MATCH Let Sn=An+Bn+Cn+Dn

15. Procedure – Part 3 15 Hand Biometrics Combine “Testing” samples for entire table (8 samples) Mix and shuffle “Testing” samples Each group picks 2 random Testing samples For each sample, use your RULE to determine if there is a match in your “Database” and, if yes, which entry matches

16. Procedure – Part 3 16 Hand Biometrics Fill in worksheet