Embed Size (px)
DESCRIPTION
A Taxonomy of Definitions for Usability Studies in Biometrics. Brian Stanton. User satisfaction. @&#*%. Context of use. Ease of use. Capture Threshold. Sample. Polling. Traditional Fingerprint System View. Opportunity (“please place your hand on the scanner”). System starts capture. - PowerPoint PPT Presentation
Citation preview
Biometrics and Usability
A Taxonomy of Definitions for Usability Studies in Biometrics
Brian Stanton
Biometrics and Usability
22
Context of use
User satisfaction
Ease of use Capture ThresholdPollingSample
@&#*%
Biometrics and Usability 3
Traditional Fingerprint System View
Opportunity (“please place your hand on the scanner”)
System starts capture
Capture
System ends capture
Capture thresholding
Time
System
System accepts/rejects sample
Biometrics and Usability
44
User
Operator
Scanner
Digital Fingerprinting
Biometrics and Usability 5
Holistic System View
Opportunity (“please place your hand on the scanner”)
System starts captureCaptur
e
System ends capture (“Please remove hand from scanner”)
Capture thresholding
Time
SystemUser places hand
on scanner
User removes hand from
scannerUser System accepts/rejects sample
Biometrics and Usability
Demographics• Age• Gender• Height• Experience• Ability
6
Holistic System View
Time
System
User
Instructions
Anthropometrics
Affordance
Accessibility
Opportunity (“please place your hand on the scanner”)
System starts capture
Capture
System ends capture (“Please remove hand from scanner”)
Capture thresholdingUser places hand
on scanner
User removes hand from
scannerSystem accepts/rejects sample
Biometrics and Usability
77
Presentation: The display of biometric characteristics to a sensor.
A user may present multiple characteristics simultaneously
Simultaneous presentations are not necessarily constrained to any particular specific biometric modality
Biometrics and Usability
88
Presentations may be further qualified as explicit or implicit
explicit presentation is a presentation that the presenter provides with their awareness
User
Operator
Scanner
Biometrics and Usability
99
Presentations may be further qualified as explicit or implicit
explicit presentation is a presentation that the presenter provides with their awareness
implicit presentation is a presentation that the presenter provides without their awareness
Biometrics and Usability
1010
Presentations may be further qualified as cooperative or uncooperative
Cooperative presentation is a presentation that the presenter provides willingly
Uncooperative presentation is a presentation that the presenter provides unwillingly
Biometrics and Usability 11
So what happens around a Presentation
Time
System
User
?
?
?
Presentation
Biometrics and Usability
An Attempt is a response to an opportunity to make a presentation
Place right hand on scanner
Time
Attempt
Opportunity
Presentation
Biometrics and Usability
A presentation may span multiple attempts
Place left hand on scanner
Place your right hand on scanner
Time
Attempt 1
Opportunity1
Presentation
Opportunity2
Attempt 2
Biometrics and Usability
A user may respond to a presentation opportunity with a lack of presentation Place right
hand on scanner
Time
Attempt 1
Opportunity1
Biometrics and Usability
1515
An attempt may be further qualified as acceptable or unacceptable
Acceptable attempt is an attempt that fulfills the minimal capture requirements of a system. Acceptable attempts must yield the minimum required biometric data from a working system in a particular configuration
Unacceptable attempt does not fulfill the minimal capture requirements of a system
Biometrics and Usability
Unacceptable/Acceptable Attempts
Acceptable
Unacceptable
Place right hand on scanner
Attempt
Opportunity
Presentation
Biometrics and Usability
1717
A task is a set of user behaviors that defines an attempt.
An attempt may also be qualified with respect to its conformance or non-conformance to a task.
Conformant attempt is an attempt that fulfills the requirements set out by a task.
Non-conformant attempt is an attempt that does not fulfill the requirements set out by a task.
Biometrics and Usability
Conformant/Non-Conformant Attempts Place
yourright hand
on the scanner
= Task : Conformant≠ Task : Non-Conformant
Attempt
Opportunity
Task:
Biometrics and Usability
Types of Attempts
Acceptability
Conformance
Acceptable Conformant
Unacceptable Conformant
Acceptable Non-conformant
Unacceptable Non-conformant
Biometrics and Usability
2020
• Participant A presents a right hand to the fingerprint sensor, which the system detects and approves.
• The user behavior (the presentation of the right hand) yields an attempt that is acceptable (the system detects and approves the data) and conformant (the user fulfilled the right hand task).
Acceptable Conformant Attempt
ConformantAcceptable
Attempt
Task: “Place your right hand on the scanner”
Biometrics and Usability
2121
• Participant B also presents a right hand to the fingerprint sensor, but the system rejects it.
• The user behavior yields an attempt that is unacceptable (it was rejected) yet conformant (the user presented the right hand as they were instructed)
Unacceptable/Conformant Attempt
ConformantUnacceptable
Attempt
Task: “Place your right hand on the scanner”
Biometrics and Usability
2222
• Participant C presents a left hand to the fingerprint sensor, which the system approves.
• The fingerprint scan is acceptable (it was approved) but non-conformant, since the user behavior (the left hand) did not fulfill the task requirements
Acceptable/Non-conformant Attempt
Non-conformantAcceptable
Attempt
Task: “Place your right hand on the scanner”
Biometrics and Usability
2323
Unacceptable/Non-conformant Attempt
Non-conformant
Unacceptable
Attempt
Task: “Place your right hand on the scanner”
• Participant D is distracted and makes no presentation to the fingerprint sensor and the system “times out”—i.e., no biometric data was collected within a specified interval.
• This attempt is unacceptable (no hand was detected on the scanner) and non-conformant (the response to the presentation opportunity was to do nothing).
Biometrics and Usability
2424
Presentation◦ Explicit◦ Implicit◦ Cooperative◦ Uncooperative
Task Attempt
◦ Acceptable◦ Unacceptable◦ Conformant◦ Non-
conformant
Terms
Usability and Biometrics websitehttp://zing.ncsl.nist.gov/biousa/
Taxonomy can be found at:
Thank you
![Usability and Security Perceptions of Implicit ......natural, unobtrusive future of smartphone biometrics” [22]. Researchers have proposed to use IA as a middle ground for those](https://img.pdfslide.us/doc/110x75/5ec5a3c1691079698166a179/usability-and-security-perceptions-of-implicit-natural-unobtrusive-future.jpg)
