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What Factors Cause Biometric Systems to Fail?
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Facial recognition
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Change in facial hair
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Change in hairstyle
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Lighting conditions
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Adding/removing hat
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Adding/removing glasses
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Change in weight
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Change in facial aspect (angle at
which facial image is captured)
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Too much or too little movement
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Quality of capture device
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Change between enrollment and
verification cameras (quality and placement)
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‘Loud’ clothing that can distract face
location
Hand geometry
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Jewelry
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Change in weight
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Bandages
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Swelling of joints
Signature-scan
In addition, for many systems, an
additional strike occurs when a long period of time has elapsed
since enrollment or since one’s last verification. If significant
time has elapsed since enrollment, physiological changes can
complicate verification. If time has elapsed since a user’s last
verification, the user may have “forgotten” how he or she enrolled,
and may place a finger differently or recite a pass phrase with
different intonation. For the most part, a single strike will
probably not materially affect the performance of a given system.
However, as you have more and more strikes for a given submission,
your chances of a successful verification diminish.
These strikes do not include inherent
characteristics such as age, ethnicity, or gender, which can also
affect system accuracy. The performance of many biometric systems
varies for specific populations.
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