Method and system for calibration of a fingerprint sensing device
First Claim
1. A fingerprint sensing device comprising an array of sensing elements configured to sense a fingerprint pattern, said device comprising at least one processor configured to:
- acquire information indicative of a change of an environmental parameter influencing the operation of said fingerprint sensing device; and
if said change is larger than a predetermined threshold value, perform a calibration operation of said fingerprint sensing device,wherein said fingerprint sensing device further comprises a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor,wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength,wherein acquiring information indicative of a change of an environmental parameter comprises;
determining a present value of the environmental parameter;
determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and
if said difference is larger than said predetermined threshold value, performing said calibration operation of said fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation.
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Abstract
There is provided a method of initiating a calibration operation of a fingerprint sensing device comprising an array of sensing elements for sensing a fingerprint pattern, the method comprising acquiring information indicative of a change of an environmental parameter influencing the operation of the fingerprint sensing device; and if the change is larger than a predetermined threshold value, performing a calibration operation of the fingerprint sensing device. There is also provided a method of initiating a calibration operation of a fingerprint sensing device comprising an array of sensing elements for sensing a fingerprint pattern, the method comprising: receiving information indicative of an event in a device in which the fingerprint sensing device is arranged; if the event is one of a group of predetermined events, performing a calibration operation of the fingerprint sensing device.
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Citations
14 Claims
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1. A fingerprint sensing device comprising an array of sensing elements configured to sense a fingerprint pattern, said device comprising at least one processor configured to:
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acquire information indicative of a change of an environmental parameter influencing the operation of said fingerprint sensing device; and if said change is larger than a predetermined threshold value, perform a calibration operation of said fingerprint sensing device, wherein said fingerprint sensing device further comprises a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor, wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength, wherein acquiring information indicative of a change of an environmental parameter comprises; determining a present value of the environmental parameter; determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and if said difference is larger than said predetermined threshold value, performing said calibration operation of said fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of initiating a calibration operation of a fingerprint sensing device comprising an array of sensing elements configured to sense a fingerprint pattern, said method comprising:
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acquiring information indicative of a change of an environmental parameter influencing the operation of said fingerprint sensing device; and if said change is larger than a predetermined threshold value, initiating a calibration operation of said fingerprint sensing device, wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength, wherein acquiring information indicative of a change of an environmental parameter comprises; determining a present value of the environmental parameter; determining a difference between said present value of said environmental parameter and a predetermined value of said environmental parameter; and if said difference is larger than said predetermined threshold value, performing said calibration operation of said fingerprint sensing device, and wherein said predetermined value of said environmental parameter is a value determined at a last performed calibration operation. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification