Patent ID: 11935319
Assignee: FINGERPRINT CARDS ANACATUM IP AB
Field: Measurement (Instruments)
Classification: CPC G  A | IPC G

Claim 13:
14. A fingerprint sensing system for determining a fingerprint representation of a finger, the fingerprint sensing system comprising:
a fingerprint sensor comprising a plurality of sensing structures covered by a dielectric structure, the fingerprint sensor being controllable between:
an evaluation mode in which an image provided by the fingerprint sensor indicates, for each sensing structure in the plurality of sensing structures, a capacitive coupling between the sensing structure and at least one other sensing structure in the plurality of sensing structures; and
a fingerprint sensing mode in which an image provided by the fingerprint sensor indicates, for each sensing structure in the plurality of sensing structures, a capacitive coupling between the sensing structure and the finger; and
the fingerprint evaluation system according to claim 12 connected to the fingerprint sensor, and configured to:
control the fingerprint sensor to the evaluation mode and acquire a first image;
control the fingerprint sensor to the fingerprint sensing mode and acquire a second image;
modify the second image based on the first image to form a modified second image; and
determine the fingerprint representation based on the modified second image.