METHOD AND SYSTEM FOR CALIBRATION OF A FINGERPRINT SENSING DEVICE

• US 20170323137A1
• Filed: 07/27/2017
• Published: 11/09/2017
• Est. Priority Date: 11/13/2015
• Status: Abandoned Application

• Current Assignee: Fingerprint Cards AB
• Original Assignee: Fingerprint Cards AB
• Inventors: Andersson, Markus, Danielsson, Mikael
• Application Number:
  US15/661,680
• Publication Number:
  US 20170323137A1
• Time in Patent Office: Days
• CPC Class Codes: G06V 10/147 Details of sensors, e.g. sensor lenses fingerprint or palmprint sensors G06V40/13; vascular sensors G06V40/145; eye sensors G06V40/19
• CPC Class Codes: G06V 40/1306 non-optical, e.g. ultrasonic or capacitive sensing

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.

Claims

1. A method of initiating a calibration operation of a fingerprint sensing device comprising an array of sensing elements for sensing a fingerprint pattern, said method comprising:

acquiring information indicative of a change of an environmental parameter influencing the operation of said fingerprint sensor; and

if said change is larger than a predetermined threshold value, initiating a calibration operation of said fingerprint sensor.

2. The method according to claim 1, further comprising:

determining a present value of an 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 sensor.

3. The method according to claim 2, wherein said predetermined value of said environmental parameter is a value determined at the last performed calibration operation.

4. The method according to claim 1, wherein said environmental parameter is selected from the group comprising humidity, temperature and electrical field strength.

5. The method according to claim 2, wherein determining a present value of an environmental parameter comprises acquiring information from a sensor integrated in said fingerprint sensing device.

6. The method according to claim 2, wherein determining a present value of an environmental parameter comprises acquiring information from a sensor external to said fingerprint sensing device.

7. The method according to claim 2, wherein determining a present value of an environmental parameter comprises acquiring information via a network connection.

8. The method according to claim 1, further comprising initiating a second calibration operation of said fingerprint sensing device a predetermined time after a first operation has been performed resulting from said change in environmental parameter.

9. A method of initiating a calibration operation of a fingerprint sensing device comprising an array of sensing elements for sensing a fingerprint pattern, said method comprising:

receiving information indicative of an event in a user device in which said fingerprint sensing device is arranged; and

if said event is one of a group of predetermined events, initiating a calibration operation of said fingerprint sensing device.

10. The method according to claim 9, wherein said group of predetermined events comprises events requiring a user interaction with said user device in which said fingerprint sensing device is arranged.

11. The method according to claim 10, wherein said group of predetermined events comprises an incoming call, an alarm, an incoming message and an incoming notification.

12. The method according to claim 9, wherein said event comprises a change in a network connection.

13. The method according to claim 12, wherein said change in network connection comprises a change in cell ID in a cellular network.

14. The method according to claim 12, wherein said change in network connection comprises a change of strength in a wireless network connection.

15. The method according to claim 9, wherein said event comprises a change in location of said user device in which said fingerprint sensing device is arranged.

16. The method according to claim 9, wherein said event comprises connecting a charger to said user device in which said fingerprint sensing device is arranged.

17. The method according to claim 9, further comprising waiting for a minimum period of time between consecutive calibration operations.

18. The method according to claim 9, further comprising initiating a second calibration operation of said fingerprint sensing device a predetermined time after a first operation has been performed resulting from said indication of said event.

19. A fingerprint sensing device comprising an array of sensing elements for sensing a fingerprint pattern, said device comprising a calibration control unit configured to:

acquire information indicative of a change of an environmental parameter influencing the operating of said fingerprint sensing device;

if said change is larger than a predetermined threshold value, perform a calibration operation of said fingerprint sensing device;

receive information indicative of an event in a device in which said fingerprint sensing device is arranged; and

if said event is one of a group of predetermined events, perform a calibration operation of said fingerprint sensing device.

20. The fingerprint sensing device according to claim 19, further comprising a temperature sensor, a humidity sensor, and/or an electromagnetic field sensor.