Hand Biometrics
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Transcript of Hand Biometrics
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Hand Biometrics Measurement and biometric
technologies for identification and security applications
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+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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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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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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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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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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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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Measuring a hand
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Measurement A:Distance from index fingertip to bottom knuckle
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Measuring a hand
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Measurement B:Width of ring finger, measured across the top knuckle
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Measuring a hand
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Measurement C:Width of palm across 4 bottom knuckles
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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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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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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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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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