Fingerprint sensing apparatus with finger position indication

• US 5,852,670 A
• Filed: 12/30/1997
• Issued: 12/22/1998
• Est. Priority Date: 01/26/1996
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Setlak, Dale R., Chan, Ellery Y., Schmitt, John C., Wilson, Steven D.
• Primary Examiner(s): Boudreau, Leo H.
• Assistant Examiner(s): Werner, Brian P.
• Application Number:
  US08/000,771
• Time in Patent Office: 357 Days
• Field of Search: 382/124-127, 382/274, 70/277, 356/71, 340/825.34, 283/68, 283/69, 396/13
• US Class Current: 382/126
• CPC Class Codes: G06V 10/20 Image preprocessing
• CPC Class Codes: G06V 40/1306 non-optical, e.g. ultrasonic or capacitive sensing
• CPC Class Codes: G06V 40/1347 Preprocessing; Feature extraction
• CPC Class Codes: G06V 40/67 by interactive indications to the user
• CPC Class Codes: G07C 9/37 using biometric data, e.g. fingerprints, iris scans or voice recognition

Abstract

A fingerprint sensing device includes a fingerprint sensor, a processor for determining an actual fingerprint position on the fingerprint sensor relative to a desired fingerprint position, and a finger position indicator for generating a finger position indication to assist the user in positioning the finger to the desired fingerprint position based upon the actual fingerprint position on the fingerprint sensor. The processor preferably calculates a fingerprint center point defining the actual fingerprint position. The fingerprint sensor may be provided by an electric field sensor in integrated circuit form. The finger position indicator may be provided by a visual indicator, such as a desired position image indicia generator for generating image indicia on a display screen relating to the desired fingerprint position on the fingerprint sensor, and wherein an actual fingerprint position image is also generated relative to the desired position image indicia on the display screen. The desired position image indicia may preferably be a desired fingerprint center point indicia image. Method aspects of the invention are also disclosed.

Claims

1. A fingerprint sensing apparatus comprising:

a fingerprint sensor including a plurality of sensing elements for sensing identifying features of a fingerprint from a finger of a user;

a processor operatively connected to said plurality of sensing elements of said fingerprint sensor for determining an actual fingerprint position on said fingerprint sensor relative to a desired fingerprint position based on the sensed identifying features; and

finger position indicator means operatively connected to said processor for generating a finger position indication to assist the user in positioning the finger to the desired fingerprint position based upon the actual fingerprint position on said fingerprint sensor.

2. A fingerprint sensing apparatus according to claim 1 wherein said processor comprises center point calculating means for calculating a fingerprint center point defining the actual fingerprint position.

3. A fingerprint sensing apparatus according to claim 2 wherein said processor comprises analyzing means for analyzing identifying features of a fingerprint over at least a minimum fingerprint portion relative to a fingerprint center point;

and wherein said processor comprises desired fingerprint position determining means for determining a desired fingerprint position based upon the minimum fingerprint portion relative to the fingerprint center point.

4. A fingerprint sensing apparatus according to claim 1 wherein said plurality of sensing elements of said fingerprint sensor comprises:

an array of electric field sensing electrodes;

a dielectric layer adjacent said electric field sensing electrodes, said dielectric layer for receiving a finger adjacent thereto; and

drive means for applying an electric field drive signal to said electric field sensing electrodes and adjacent portions of the finger so that said electric field sensing electrodes produce a fingerprint image signal representative of identifying features of a fingerprint.

5. A fingerprint sensing apparatus according to claim 4 wherein said fingerprint sensor further comprises dynamic contrast enhancement means operatively connected to said electric field sensing electrodes for enhancing a contrast of the fingerprint image signal.

6. A fingerprint sensing apparatus according to claim 1 wherein said fingerprint sensor comprises an integrated circuit having an upper surface portion for receiving a finger thereon.

7. A fingerprint sensing apparatus according to claim 1 wherein said finger position indicator means comprises a visual indicator.

8. A fingerprint sensing apparatus according to claim 1 wherein said finger position indicator means comprises:

a display screen;

desired position image indicia generating means for generating image indicia on said display screen relating to the desired fingerprint position on said fingerprint sensor; and

actual fingerprint position image generating means for generating an actual fingerprint position image relative to the desired position image indicia on said display screen.

9. A fingerprint sensing apparatus according to claim 8 wherein said desired position image indicia generating means comprises means for generating desired fingerprint center point image indicia on said display screen.

10. A fingerprint sensing apparatus according to claim 1 wherein said finger position indicator means comprises a speech message generator.

11. A fingerprint sensing apparatus according to claim 1 wherein said finger position indicator means comprises a display screen, and a display screen message generator operatively connected to said display screen.

12. A fingerprint sensing apparatus according to claim 1 wherein said finger position indicator means comprises directional indicators for indicating desired repositioning of the finger.

13. A fingerprint sensing apparatus according to claim 1 wherein said processor further comprises pressure determining means for determining if the finger is positioned on said fingerprint sensor at a desired fingerprint pressure;

and further comprising pressure indicating means for generating a finger pressure indication to assist the user in applying the desired fingerprint pressure.

14. A fingerprint sensing apparatus according to claim 1 further comprising reference fingerprint storage means for storing reference fingerprint information;

and wherein said processor comprises reference fingerprint matching means for determining if a sensed fingerprint matches a stored reference fingerprint.

15. A fingerprint sensing apparatus comprising:

a fingerprint sensor including a plurality of sensing elements for sensing identifying features of a fingerprint from a finger of a user;

a processor operatively connected to said plurality of sensing elements of said fingerprint sensor for determining a fingerprint center point defining an actual fingerprint position relative to a desired fingerprint position based on the sensed identifying features; and

finger position indicator means operatively connected to said processor for generating a finger position indication to assist the user in positioning the finger to the desired fingerprint position based upon the actual fingerprint position on said fingerprint sensor.

16. A fingerprint sensing apparatus according to claim 15 wherein said processor comprises analyzing means for analyzing identifying features of a fingerprint over at least a minimum fingerprint portion relative to a fingerprint center point;

and wherein said processor comprises desired fingerprint position determining means for determining a desired fingerprint position based upon the minimum fingerprint portion relative to the fingerprint center point.

17. A fingerprint sensing apparatus according to claim 15 wherein said plurality of sensing elements of said fingerprint sensor comprises:

an array of electric field sensing electrodes;

a dielectric layer adjacent said electric field sensing electrodes, said dielectric layer for receiving a finger adjacent thereto; and

drive means for applying an electric field drive signal to said electric field sensing electrodes and adjacent portions of the finger so that said electric field sensing electrodes produce a fingerprint image signal representative of identifying features of a fingerprint.

18. A fingerprint sensing apparatus according to claim 17 wherein said fingerprint sensor further comprises dynamic contrast enhancement means operatively connected to said electric field sensing electrodes for enhancing a contrast of the fingerprint image signal.

19. A fingerprint sensing apparatus according to claim 15 wherein said finger position indicator means comprises a visual indicator.

20. A fingerprint sensing apparatus according to claim 15 wherein said finger position indicator means comprises:

a display screen;

desired position image indicia generating means for generating image indicia on said display screen relating to the desired fingerprint position on said fingerprint sensor; and

actual fingerprint position image generating means for generating an actual fingerprint position image relative to the desired position image indicia on said display screen.

21. A fingerprint sensing apparatus according to claim 20 wherein said desired position image indicia generating means comprises means for generating a desired fingerprint center point image indicia on said display screen.

22. A fingerprint sensing apparatus according to claim 15 wherein said finger position indicator means comprises a speech message generator.

23. A fingerprint sensing apparatus according to claim 15 wherein said finger position indicator means comprises a display screen, and a display screen message generator operatively connected to said display screen.

24. A fingerprint sensing apparatus according to claim 15 wherein said finger position indicator means comprises directional indicators for indicating desired repositioning of the finger.

25. A fingerprint sensing apparatus according to claim 15 wherein said processor further comprises pressure determining means for determining if the finger is positioned on said fingerprint sensor at a desired fingerprint pressure;

and further comprising pressure indicating means for generating a finger pressure indication to assist the user in applying the desired fingerprint pressure.

26. A fingerprint sensing apparatus according to claim 15 further comprising reference fingerprint storage means for storing reference fingerprint information;

and wherein said processor comprises reference fingerprint matching means for determining if a sensed fingerprint matches a stored reference fingerprint.

27. A computer workstation comprising:

a display screen and a processor operatively connected thereto; and

a fingerprint sensor including a plurality of sensing elements operatively connected to said processor for sensing identifying features of a fingerprint from a finger of a user;

said processor comprising

finger position determining means for determining an actual fingerprint position based on the sensed identifying features on said fingerprint sensor relative to a desired fingerprint position, and

finger position image indicator means for generating on said display screen a finger position indication image to assist the user in positioning the finger to the desired fingerprint position based upon the actual fingerprint position on said fingerprint sensor.

28. A computer workstation according to claim 27 wherein said processor comprises center point calculating means for calculating a fingerprint center point defining the actual fingerprint position.

29. A computer workstation according to claim 28 wherein said processor further comprises desired position image indicia generating means for generating a desired fingerprint center point image indicia on said display screen.

30. A computer workstation according to claim 28 wherein said processor comprises analyzing means for analyzing identifying features of a fingerprint over at least a minimum fingerprint portion relative to a fingerprint center point;

and wherein said processor comprises desired fingerprint position determining means for determining a desired fingerprint position based upon the minimum fingerprint portion relative to the fingerprint center point.

31. A computer workstation according to claim 27 wherein said plurality of sensing elements of said fingerprint sensor comprises:

an array of electric field sensing electrodes;

a dielectric layer adjacent said electric field sensing electrodes, said dielectric layer for receiving a finger adjacent thereto; and

drive means for applying an electric field drive signal to said electric field sensing electrodes and adjacent portions of the finger so that said electric field sensing electrodes produce a fingerprint image signal representative of the sensed identifying features.

32. A computer workstation according to claim 31 wherein said fingerprint sensor further comprises dynamic contrast enhancement means operatively connected to said electric field sensing electrodes for enhancing a contrast of the fingerprint image signal.

33. A computer workstation according to claim 27 wherein said fingerprint sensor comprises an integrated circuit having an upper surface portion for receiving a finger thereon.

34. A computer workstation according to claim 27 wherein said processor further comprises pressure determining means for determining if the finger is positioned on said fingerprint sensor at a desired fingerprint pressure;

and further comprising pressure indicating means for generating a finger pressure indication on said display screen to assist the user in applying the desired fingerprint pressure.

35. A computer workstation according to claim 27 further comprising reference fingerprint storage means for storing reference fingerprint information;

and wherein said processor comprises reference fingerprint matching means for determining if a sensed fingerprint matches a stored reference fingerprint and for enabling further operation of said processor based upon a fingerprint match.