the user and biometric system uncertainty
DESCRIPTION
Mary Theofanos. The User and Biometric System Uncertainty. International Workshop on Usability and Biometrics June 23- 24, 2008. The field of biometrics has tested, measured and reported performance statistics independent of the user Error Bounds are defined as combination of: - PowerPoint PPT PresentationTRANSCRIPT
Biometrics and Usability
The User and Biometric System Uncertainty
Mary Theofanos
International Workshop on Usability and BiometricsJune 23- 24, 2008
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The field of biometrics has tested, measured and reported performance statistics independent of the user
Error Bounds are defined as combination of:
• uncertainty resulting from random effect• uncertainty resulting from systematic effect
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User Characteristics Age Gender Height Experience Ability Perception
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Biometric System Factors
Anthropometrics Affordance Instructions Accessibility
Can we link the systematic uncertainty of fingerprint quality and performance metrics to human factors?
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Habituation Study found a number of human factors that influence quality
Age: Younger participants submit higher quality images than older participants
Gender: Women’s images, on average, are of poorer quality than men’s
Feedback ◦Habituation has no influence without
feedback◦Older participants left higher quality images
over time with feedback
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Anthropometrics: Effect of Sensor Height on qualityImage quality: All fingers are sensitive to height except
Right index finger Thumbs are more sensitive to height than
slaps Left slap is more sensitive than right slap Drop in quality from individual thumbprints
to simultaneously captured thumbprints Consistently able to provide higher quality
prints for work surfaces lower than 42 inches (107 cm)
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Anthropometrics: Effect of Sensor Height on Efficiency
Time (Efficiency) Counter height of 36 inches (91cm) yields
fastest performance Most efficient capture sequence starts with
right hand
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Poster Participants: took significantly longer to complete the 10-print collection process made significantly more errors only 56% were able to successfully complete the fingerprinting process left the poorest quality images using NFIQ.
Verbal and video instructions
performed equally well
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Operators are critical to the acquisition process
Operators are able to assist individuals to overcome the deficits of the instructional materials
With operator assistance 98% of participants were able to successfully complete the fingerprint process
Verbal instructions were most preferred by participants
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What about counter height and angle of the fingerprint scanner ?
Biometrics and Usability
1010We have demonstrated a link between human factors quality and performance metrics
At BCC last fall Jim Wayman stated that:
Laboratory results are not a good predictor of “real-world” performance
Systematic uncertainty attributable to uncontrolled variability in human factors
Improving biometrics will require emphasis on human factors not the purely “technical” aspects