Fingerprint Sensor Limitations - Toshiba S3 User Manual

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Observe the following to improve the fingerprint recognition
success rate.
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Enroll two or more fingers.
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Enroll additional fingers if recognition failure occurs
often using enrolled fingers.
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Check your finger condition. Changed conditions, such
as injured, rough, extremely dry, wet, soiled, dirty, oily,
soaked, swollen fingers, may lower the recognition
success rate. Also if the fingerprint is worn down or the
finger becomes thinner or fatter, the recognition success
rate may be lowered.
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The fingerprint for each finger is different and unique.
Please ensure that only the registered or enrolled
fingerprint or fingerprints are used for identification.
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Check sliding position and speed (see illustration below).
Sample aligning the finger on the sensor

Fingerprint sensor limitations

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The fingerprint sensor compares and analyzes the unique
characteristics in a fingerprint. However, there may be
instances where certain users are unable to register their
fingerprints due to insufficiently unique characteristics in
their fingerprints.
Wet finger
Soiled or oily finger
Extremely dry skin condition on finger
Toshiba Utilities
Fingerprint recognition utility
217