Obtaining A Biometric Image And Handling Damaged Biometrics
AssigneeBlackBerry Limited
InventorsPeter Mankowski, Adam Sosnowski, Krzysztof Zawada
Life of this patent
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Abstract
Inspired by Shack Hartmann Wavefront Patterns, a device may obtain three dimensional images for use in authentication. Since such images can have high resolution, damage in, for instance, skin on a finger may be recorded and used as part of a temporary template image. In future authentication attempts, an aged version of the temporary template image may be used. Additionally, reference points on the damage may be employed when authenticating.
Claims10
1-11. (canceled)
A method of authenticating a user in a system wherein a temporary template fingerprint image has been stored, the method comprising:
- obtaining a candidate fingerprint image;
- generating an aged version of the temporary template fingerprint image, the generating based on modeling a change expected to have occurred between a time of generation of the temporary template fingerprint image and a current time;
- analyzing a degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image;
- determining that the degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image surpasses a threshold;
- and
- responsive to the determining, granting access to a system.
An image signal processor arranged to:
- obtain a candidate fingerprint image;
- generate an aged version of the temporary template fingerprint image, the generating based on modeling a change expected to have occurred between a time of generation of the temporary template fingerprint image and a current time;
- analyze a degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image;
- determine that the degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image surpasses a threshold;
- and
- responsive to the determining, grant access to a system.
A non-transitory computer readable medium containing computer-executable instructions that, when performed by a processor in a photography subsystem, cause the processor to:
- obtain a candidate fingerprint image;
- generate an aged version of the temporary template fingerprint image, the generating based on modeling a change expected to have occurred between a time of generation of the temporary template fingerprint image and a current time;
- analyze a degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image;
- determine that the degree of correspondence between the candidate fingerprint image and the aged version of the temporary template fingerprint image surpasses a threshold;
- and
- responsive to the determining, grant access to a system.
Dependencies are inferred from the claim text.