User Indentification with Capacitive Touchscreen

• US 20120110662A1
• Filed: 10/31/2010
• Published: 05/03/2012
• Est. Priority Date: 10/31/2010
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Brosnan, Michael
• Granted Patent: US 8,566,955 B2
• Time in Patent Office: Days
• US Class Current: 726/19
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06V 40/12 Fingerprints or palmprints

Abstract

Disclosed herein are various embodiments of means and methods for verifying or authorizing one or more verified or authorized users to operate or use an electronic device containing a capacitive or other type of touchscreen or touch panel. Images are acquired from the touchscreen or touch panel and processed to determine first characteristics corresponding to fingers, hands or hand portions placed thereon. If the first characteristics match stored second characteristics with a sufficient degree of similarity, the user is identified as an authorized or verified user and then permitted to operate or use the electronic device.

Claims

1. A method of authorizing a user to use an electronic device comprising a capacitive touchscreen system, the method comprising:

placing at least one of a user'"'"'s first hand, first hand portion, or plurality of fingers in contact with or in proximity to a capacitive touchscreen forming a portion of the capacitive touchscreen system;

generating, with capacitive electrodes in the capacitive touchscreen and a touchscreen controller operably connected to the electrodes, at least one acquired image of the user'"'"'s first hand, first hand portion, or plurality of fingers;

extracting from the acquired image, with the touchscreen controller, a first set of characteristics corresponding to the user'"'"'s first hand, hand portion, or plurality of fingers;

comparing, with the touchscreen controller, the first set of characteristics to a second set of characteristics, the second set of characteristics being stored in a memory, firmware, hardware circuitry, or in a storage device operably connectable to or forming a portion of the touchscreen controller, the second set of characteristics corresponding to at least one authorized user'"'"'s first hand, first hand portion, or plurality of fingers;

determining, with the touchscreen controller, whether the first set of characteristics meets or exceeds a predetermined degree of similarity with respect to the second set of characteristics, and

if the first set of characteristics meets or exceeds the predetermined degree of similarity, verifying the user as at least one of the authorized users of the device and permitting the user to use the device.

2. The method of claim 1, further comprising determining, in the touchscreen controller, the predetermined degree of similarity using mean square difference computational methods.

3. The method of claim 1, further comprising determining, in the touchscreen controller, the predetermined degree of similarity using cross-correlation computational methods.

4. The method of claim 1, wherein the second set of characteristics is extracted from at least one authorization image corresponding to the authorized user'"'"'s first hand, first hand portion, or plurality of fingers

5. The method of claim 1, wherein extracting the first set of characteristics corresponding to the user'"'"'s first hand, first hand portion, or plurality of fingers further comprises extracting at least one of contact areas, centers of contact areas, signal strengths corresponding to contact areas, contact shapes, finger spacing, and finger orientations that correspond to the user'"'"'s first hand, first hand portion, or plurality of fingers.

6. The method of claim 1, further comprising rotating, in the touchscreen controller, a first set of data corresponding to the first set of characteristics with respect to a second set of data corresponding to the second set of characteristics.

7. The method of claim 6, further comprising aligning, in the touchscreen controller, the first set of data with respect to the second set of data to find a match having predetermined characteristics therebetween.

8. The method of claim 1, further comprising shifting, in the touchscreen controller, a first set of data corresponding to the first set of characteristics with respect to a second set of data corresponding to the second set of characteristics.

9. The method of claim 8, further comprising aligning, in the touchscreen controller, the first set of data with respect to the second set of data to find a match having predetermined characteristics therebetween.

10. The method of claim 1, wherein the first set of characteristics are further determined on the basis of the user'"'"'s second hand, second hand portion, or plurality of fingers from the second hand.

11. The method of claim 1, wherein second set of characteristics is one of a plurality of separate sets of characteristics, each separate set of characteristics corresponding to a unique authorized user.

13. The method of claim 1, wherein the electronic device is a mobile electronic device.

13-1. The method of claim 12, wherein the mobile device is one of a computer, a notebook computer, a laptop computer, a personal data assistant (PDA), a mobile telephone, a smart phone, an electronic book reader, a radio, an MP3 player, and a portable music player.

14. An electronic device comprising a capacitive touchscreen system, comprising:

a capacitive touchscreen;

a touchscreen controller operably connected to the capacitive touchscreen, the touchscreen controller being configured to detect at least one of a user'"'"'s first hand, first hand portion, or plurality of fingers placed in contact with or in proximity to the capacitive touchscreen, the touchscreen controller further being configured to generate in conjunction with capacitive electrodes in the capacitive touchscreen at least one acquired image of the user'"'"'s first hand, first hand portion, or plurality of fingers, the touchscreen controller further being configured to extract from the acquired image a first set of characteristics corresponding to the user'"'"'s first hand, hand portion, or plurality of fingers, compare the first set of characteristics to a second set of characteristics corresponding to at least one authorized user'"'"'s first hand, first hand portion, or plurality of fingers, determine whether the first set of characteristics meets or exceeds a predetermined degree of similarity with respect to the second set of characteristics, determine whether the first set of characteristics meets or exceeds the predetermined degree of similarity, and verify the user as at least one of the authorized users of the device.

15. The capacitive touchscreen system of claim 14, wherein the touchscreen controller further comprises memory, firmware, hardware circuitry, or a storage device operably connectable to or forming a portion thereof for storing the second set of characteristics.

16. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to determine the predetermined degree of similarity using mean square difference computational methods.

17. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to determine the predetermined degree of similarity using cross-correlation computational methods.

18. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to extract the second set of characteristics from at least one authorization image corresponding to the authorized user'"'"'s first hand, first hand portion, or plurality of fingers.

19. The capacitive touchscreen system of claim 14, wherein the first set of characteristics is at least one of contact areas, centers of contact areas, signal strengths corresponding to contact areas, contact shapes, finger spacing, and finger orientations that correspond to the user'"'"'s first hand, first hand portion, or plurality of fingers.

20. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to rotate a first set of data corresponding to the first set of characteristics with respect to a second set of data corresponding to the second set of characteristics.

21. The capacitive touchscreen system of claim 20, wherein the touchscreen controller is further configured to align the first set of data with respect to the second set of data to find a match having predetermined characteristics therebetween.

22. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to shift a first set of data corresponding to the first set of characteristics with respect to a second set of data corresponding to the second set of characteristics.

23. The capacitive touchscreen system of claim 22, wherein the touchscreen controller is further configured to align the first set of data with respect to the second set of data to find a match having predetermined characteristics therebetween.

24. The capacitive touchscreen system of claim 14, wherein the touchscreen controller is further configured to determine the first set of characteristics on the basis of the user'"'"'s second hand, second hand portion, or plurality of fingers from the second hand.

25. The capacitive touchscreen system of claim 14, wherein the second set of characteristics is one of a plurality of separate sets of characteristics, each separate set of characteristics corresponding to a unique authorized user.

26. The capacitive touchscreen system of claim 14, wherein the electronic device is a mobile electronic device.

27. The capacitive touchscreen system of claim 26, wherein the mobile device is one of a computer, a notebook computer, a laptop computer, a personal data assistant (PDA), a mobile telephone, a smart phone, an electronic book reader, a radio, an MP3 player, and a portable music player.