Electronic device including blurred finger image deblurring circuitry and related methods

Patent metadata

Field	Value
Publication number	US-9443125-B2
Application number	US-201514955930-A
Country	US
Kind code	B2
Filing date	Dec 1, 2015
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 may include an array of electric field sensing pixels and image data output circuitry coupled thereto. 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 may also include deblurring circuitry coupled to the image data output circuitry and capable of processing the image data 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 an array of electric field sensing pixels;
a dielectric layer over the array of electric field sensing pixels and having a non-uniform thickness;
image data output circuitry coupled to the finger biometric sensor; and
deblurring circuitry coupled to the image data output circuitry and capable of
storing a plurality of deblurring coefficients for a deblurring function, the plurality of deblurring coefficients being associated with the non-uniform thickness of the dielectric layer, and
processing image data to produce processed image data in accordance with the deblurring function to account for variations of thickness across the dielectric layer.

2. The electronic device of claim 1 , wherein the deblurring function comprises an inverse Gaussian function.

3. The electronic device of claim 1 , wherein the deblurring circuitry comprises a deblurring processor and memory coupled thereto and capable of storing the image data.

4. An electronic device comprising:
a finger biometric sensor comprising an array of electric field sensing pixels;
a dielectric layer over the array of electric field sensing pixels and having a non-uniform thickness;
drive circuitry coupled to the array of electric field sensing pixels;
image data output circuitry coupled to the finger biometric sensor; and
deblurring circuitry coupled to the image data output circuitry and capable of
storing a plurality of deblurring coefficients for a deblurring function, the plurality of deblurring coefficients being associated with the non-uniform thickness of the dielectric layer, and
processing image data to produce processed image data in accordance with the deblurring function to account for variations of thickness across the dielectric layer.

5. The electronic device of claim 4 , wherein the deblurring function comprises an inverse Gaussian function.

6. The electronic device of claim 4 , wherein the finger biometric sensor comprises a finger coupling electrode adjacent the array of electric field sensing pixels and coupled to the drive circuitry.

7. A finger biometric sensing method comprising:
operating a finger biometric sensor comprising an array of electric field sensing pixels, a dielectric layer over the array of electric field sensing pixels and having a non-uniform thickness, and image data output circuitry coupled to the finger biometric sensor; and
processing image data using deblurring circuitry coupled to the image data output circuitry by
storing a plurality of deblurring coefficients for a deblurring function, the plurality of deblurring coefficients being associated with the non-uniform thickness of the dielectric layer, and
producing processed image data in accordance with the deblurring function to account for variations of thickness across the dielectric layer.

8. The method of claim 7 , wherein the deblurring function comprises an inverse Gaussian function.

9. 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 an array of electric field sensing pixels, a dielectric layer over the array of electric field sensing pixels and having a non-uniform thickness, and image data output circuitry coupled to the finger biometric sensor; and
processing image data using deblurring circuitry coupled to the image data output circuitry by
storing a plurality of deblurring coefficients for a deblurring function, the plurality of deblurring coefficients being associated with the non-uniform thickness of the dielectric layer, and
producing processed image data in accordance with the deblurring function to account for variations of thickness across the dielectric layer.

10. The non-transitory computer readable medium of claim 9 , wherein the deblurring function comprises an inverse Gaussian function.

Assignees

• Apple Inc

Inventors

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

Classifications

• G06V40/1347 Primary

  Preprocessing; Feature extraction · CPC title

• G06V10/30

  Noise filtering · CPC title

• G06V40/1306

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

• G06T5/003

  Physics · mapped topic

• G06K9/00033 Primary

  Physics · mapped topic