hand biometrics

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Hand Biometrics Measurement and biometric

technologies for identification and security applications

+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

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Objectives

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+Hand Biometrics

Measurement of a physical characteristic Examples include:

Fingerprints DNA Retinal pattern Hand dimensions

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What is a biometric?

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+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.

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Properties of a biometric

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+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

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Why use a biometric?

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+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

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Your Turn

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+Hand Biometrics

Work in groups of 4 Each person gets their hand measured 2

times You measure your own right hand Another teammate measures

your right hand 1 “Testing” sample,

1 “Database” sample DO NOT SWAP FORMS!

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Procedure – Part 1

Testing SampleA___B___C___D___

Testing SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

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+Hand Biometrics

Measuring a hand

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Measurement A:Distance from index fingertip to bottom knuckle

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+Hand Biometrics

Measuring a hand

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Measurement B:Width of ring finger, measured across the top knuckle

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+Hand Biometrics

Measuring a hand

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Measurement C:Width of palm across 4 bottom knuckles

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+Hand Biometrics

Measuring a hand

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Measurement D:Width of palm from middle knuckle of thumb across hand

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A

B

C

D

Measurement A:Distance from index fingertip to bottom knuckle

Measurement B:Width of ring

finger, measured across the top

knuckle

Measurement C:Width of palm

across 4 bottom knuckles

Measurement D:Width of palm from middle knuckle of thumb across hand

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+Hand Biometrics

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”

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Procedure – Part 2

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

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+Hand Biometrics

Let Sn=An+Bn+Cn+Dn

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Example Rule

S3 = 20.5cm

S4 = 24.9cm

S2 = 25.3cm

S1 = 22.1cm

Testing SampleA___B___C___D___

Testing SampleA___B___C___D___

S = 24.7cm

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”Error = 0.2cm

MATCH

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

Database SampleA___B___C___D___

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+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

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Procedure – Part 3

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+Hand Biometrics

Fill in worksheet

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Procedure – Part 3

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