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Biometrics and Usability
Influence of Height and Angle on Fingerprint Collections
Charles Sheppard
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Biometrics and Usability
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Given current surface heights, what is the “best” angle?
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Biometrics and Usability
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Reported Height Frequencies less 6”
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Choose three heights◦ 39”◦ 45” Practical Midpoint◦ 49”
39”45” 49”
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Biometrics and Usability
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Selected Range of Angles◦ Flat◦ 10 °◦ 20 °◦ 30 °
Flat 10° 20° 30°
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Adjustable Table
Angle Adjustment
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Biometrics and Usability
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× 4 angles = 48 prints/height
12 prints/angle
× 20 people = 960 prints per height
× 3 heights = 2,880 prints/scanner
× 2 scanners = 5,760 total prints
(120 people total)
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Given current surface heights, what is the “best” angle?
Best = ◦ Efficient —Timing — Time to complete task◦ Effective — Quality — How good were the prints◦ Satisfaction — Comfort — Questionnaire
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Biometrics and Usability
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• Age• Height• Gender• Handedness
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Timing
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Biometrics and Usability
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12
Opportunity (“please place your hand on the scanner”)
System starts capture
Capture
System ends capture (“Please remove hand from scanner”)
Capture thresholding
Time
System
Participant presentsAttempt starts
Attempt
Attempt ends
Next attempt(acceptable
attempt)
Participant
Scanner A
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Biometrics and Usability
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13
Opportunity (“please place your hand on the scanner”)
Capture
System ends Attempt (“Please remove hand from scanner”)
Capture thresholding
Time
System
Participant presentsAttempt starts
Attempt
Attempt ends
Next attempt(acceptable
attempt)
Participant
Scanner B
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Scanner A
Neither height nor angle is significant
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Scanner B
Neither height nor angle is significant
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No significant affect due to angle or height
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Quality
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NIST Fingerprint Imaging Software◦ Segmentation◦ Image Quality
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Two levels of analysis1. Individual finger NFIQ — Medians2. Individual finger NFIQ frequencies
No significant affect due to angle
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Two levels of analysis1. Individual finger NFIQ — Medians2. Individual finger NFIQ frequencies
Significant differences were found across different counter heights, the effect of which appears to be scanner dependent
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Finger #
Task #
Table Height
2 1 39”>45”. 45”<49”3 1 39”>454 1 39”>45”5 1 39”>45”7 3 39”>45”8 3 39”>49”9 3 39”>45”
10 3 +. 39”>451 2 39”>45”. 45”<49”6 4 -
11 5 -12 5 -
1
2345
6
7 8 910
1112
Quality Analysis – Median NFIQ per Quality Analysis – Median NFIQ per FingerFinger
Finger #
Task #
Table height
2 1 -
3 1 *39”>45”
4 1 39”<45”. 45”<49”
5 1 -
7 3 -
8 3 -
9 3 -
10 3 39”<45”. 45”<49”
1 2 39”>45”. 45”<49”
6 4 -
11 5 -
12 5 _
Scanner A Scanner B
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Biometrics and Usability
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NFIQ 1 or 2
NFIQ 1 or 2 or 3
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Most and Least Comfortable Angle
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Thumb Preference
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6’6” Individual having to bend knees to position hand comfortably.
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5’2” individual having to stand on toes to reach scanner.
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5’2” individual not having to stand on toes to reach scanner.
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Biometrics and Usability
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Angles have no impact on performance Height does affect qualityParticipants when given a choice start with
their right hand
Participants preferred 20° and 30° angles as counter height increased
Shorter participants struggled less at the taller counter heights when scanner was angled