Cancelling out impairment data in fingerprint images
AssigneeFingerprint Cards AB
InventorsKarl LUNDAHL, Erik SVENSSON, Morten Rolle HANSEN
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Abstract
The invention relates to a method of a fingerprint sensing system of enabling cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system, a method of a fingerprint sensing system of cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system, and a fingerprint sensing system performing the methods.
Claims24
A method of a fingerprint sensing system of enabling cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system, comprising:
- capturing an image of an object contacting the fingerprint sensor;
- detecting, from the captured image, impairment data caused by impairments that the fingerprint sensor is subjected to;
- fitting the detected impairment data to a selected mathematical model;
- and
- storing the mathematical model to which the detected impairment data is fitted, wherein the model can be used subsequently for at least partly cancelling out impairment data present in an image captured by the fingerprint sensor.
-5. (canceled)
A method of a fingerprint sensing system of cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system comprising:
- capturing an image of an object contacting the fingerprint sensor;
- acquiring a stored predetermined mathematical model representing impairment data present in the captured image, which impairment data is caused by impairments that the fingerprint sensor is subjected to;
- and
- using the acquired predetermined mathematical model to at least partly cancel out the impairment data present in the captured image.
(canceled)
A fingerprint sensing system comprising a fingerprint sensor and a processing unit, the fingerprint sensing system being configured to enabling cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system,
- the fingerprint sensor being configured to:
- capture an image of an object contacting the fingerprint sensor;
- the processing unit being configured to:
- detect, from the captured image, impairment data caused by impairments that the fingerprint sensor is subjected to;
- fit the detected impairment data to a selected mathematical model;
- and
- store the mathematical model to which the detected impairment data is fitted, wherein the model can be used subsequently for at least partly cancelling out impairment data present in an image captured by the fingerprint sensor.
-19. (canceled)
A fingerprint sensing system comprising a fingerprint sensor and a processing unit, the fingerprint sensing system being configured to cancelling out impairment data present in an image captured by a fingerprint sensor of the fingerprint sensing system,
- the fingerprint sensor being configured to:
- capture an image of an object contacting the fingerprint sensor;
- the processing unit being configured to:
- acquire a stored predetermined mathematical model representing impairment data present in the captured image, which impairment data is caused by impairments that the fingerprint sensor is subjected to;
- and
- use the acquired predetermined mathematical model to at least partly cancel out the impairment data present in the captured image.
-29. (canceled)
Dependencies are inferred from the claim text.