Electronic device including sub-array based deblurring of a blurred finger image and related methods

Patent metadata

Field	Value
Publication number	US-9443293-B2
Application number	US-201615049341-A
Country	US
Kind code	B2
Filing date	Feb 22, 2016
Priority date	Aug 6, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

An electronic device may include a finger biometric sensor that includes an array of electric field sensing pixels and image data output circuitry coupled thereto and capable of processing the image data from each of sub-arrays of the array of electric field sensing pixels. The electronic device may also include a dielectric layer over the array of electric field sensing pixels and causing electric field diffusion so that the image data output circuitry generates image data corresponding to a blurred finger image. The electronic device also includes deblurring circuitry coupled to the image data output circuitry and capable of processing the image data from each of the plurality of sub-arrays of the array of electric field sensing pixels to produce processed image data representative of a deblurred finger image.

First claim

That which is claimed is:

1. An electronic device comprising:
a finger biometric sensor comprising a plurality of sub-arrays of electric field sensing pixels and output circuitry coupled thereto;
a dielectric layer over the plurality of sub-arrays of electric field sensing pixels and causing electric field diffusion so that the output circuitry generates blurred finger image data; and
deblurring circuitry coupled to the output circuitry and capable of
storing a plurality of deblurring coefficients, and
processing the blurred finger image data using the plurality of deblurring coefficients to produce deblurred finger image data.

2. The electronic device of claim 1 , wherein the plurality of deblurring coefficients comprises a respective set of deblurring coefficients for each of a plurality of different deblurring functions.

3. The electronic device of claim 2 , wherein the deblurring circuitry is capable of processing the blurred finger image data based upon a respective deblurring function for each sub-array of electric field sensing pixels.

4. The electronic device of claim 1 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one border sub-array of electric field sensing pixels adjacent to the border.

5. The electronic device of claim 1 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one interval sub-array of electric field sensing pixels spaced inwardly from the border.

6. The electronic device of claim 1 , wherein the electric field diffusion has a diffusion function associated therewith; and wherein the deblurring circuitry is capable of processing the blurred finger image data in accordance with respective different deblurring functions for each of the plurality of sub-arrays of electric field sensing pixels based upon the diffusion function.

7. The electronic device of claim 6 , wherein the diffusion function comprises a Gaussian function and the respective deblurring functions each comprises an inverse Gaussian function.

8. The electronic device of claim 1 , wherein the dielectric layer has a non-uniform thickness.

9. The electronic device of claim 1 , wherein the deblurring circuitry comprises a deblurring processor and memory coupled thereto.

10. The electronic device of claim 1 , wherein the finger biometric sensor further comprises drive circuitry coupled to the plurality of sub-arrays of electric field sensing pixels.

11. The electronic device of claim 10 , wherein the finger biometric sensor comprises a finger coupling electrode adjacent the plurality of sub-arrays of electric field sensing pixels and coupled to the drive circuitry.

12. A method comprising:
operating a finger biometric sensor comprising a plurality of sub-arrays of electric field sensing pixels and output circuitry coupled thereto, and a dielectric layer over the plurality of sub-arrays of electric field sensing pixels and causing electric field diffusion so that the output circuitry generates blurred finger image data;
storing a plurality of deblurring coefficients; and
processing the blurred finger image data using the plurality of deblurring coefficients to produce deblurred finger image data.

13. The method of claim 12 , wherein the plurality of deblurring coefficients comprises a respective set of deblurring coefficients for each of a plurality of different deblurring functions.

14. The method of claim 13 , wherein processing comprising processing the blurred finger image data based upon a respective deblurring function for each sub-array of electric field sensing pixels.

15. The method of claim 12 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one border sub-array of electric field sensing pixels adjacent to the border.

16. The method of claim 12 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one interval sub-array of electric field sensing pixels spaced inwardly from the border.

17. The method of claim 12 , wherein the electric field diffusion has a diffusion function associated therewith; and wherein processing comprises processing the blurred finger image data in accordance with respective different deblurring functions for each of the plurality of sub-arrays of electric field sensing pixels based upon the diffusion function.

18. The method of claim 17 , wherein the diffusion function comprises a Gaussian function and the respective deblurring functions each comprises an inverse Gaussian function.

19. A non-transitory computer readable medium for finger biometric processing, the non-transitory computer readable medium comprising computer-executable instructions capable of performing the operations comprising:
operating a finger biometric sensor comprising a plurality of sub-arrays of electric field sensing pixels and output circuitry coupled thereto, and a dielectric layer over the plurality of sub-arrays of electric field sensing pixels and causing electric field diffusion so that the output circuitry generates blurred finger image data;
storing a plurality of deblurring coefficients; and
processing the blurred finger image data using the plurality of deblurring coefficients to produce deblurred finger image data.

20. The non-transitory computer readable medium of claim 19 , wherein the plurality of deblurring coefficients comprises a respective set of deblurring coefficients for each of a plurality of different deblurring functions.

21. The non-transitory computer readable medium of claim 20 , wherein processing comprising processing the blurred finger image data based upon a respective deblurring function for each sub-array of electric field sensing pixels.

22. The non-transitory computer readable medium of claim 19 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one border sub-array of electric field sensing pixels adjacent to the border.

23. The non-transitory computer readable medium of claim 19 , wherein the plurality of sub-arrays of electric field sensing pixels define an array having a border; and wherein the plurality of sub-arrays of electric field sensing pixels comprises at least one interval sub-array of electric field sensing pixels spaced inwardly from the border.

24. The non-transitory computer readable medium of claim 19 , wherein the electric field diffusion has a diffusion function associated therewith; and wherein processing comprises processing the blurred finger image data in accordance with respective different deblurring functions for each of the plurality of sub-arrays of electric field sensing pixels based upon the diffusion function.

25. The non-transitory computer readable medium of claim 24 , wherein the diffusion function comprises a Gaussian function and the respective deblurring functions each comprises an inverse Gaussian function.

Assignees

• Apple Inc

Inventors

• Setlak Dale R
• Subert Martin
• Konopka Ondrej
• Kohout Petr
• Mrazek Pavel
• Gozzini Giovanni

Classifications

• G06V40/1306 Primary

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06K9/00006

  Physics · mapped topic

• G06T5/003 Primary

  Physics · mapped topic

• G06V40/12

  Fingerprints or palmprints · CPC title

• G06T5/73

  Deblurring; Sharpening · CPC title