Method and apparatus for biometric-based security using capacitive profiles

Patent metadata

Field	Value
Publication number	US-9400880-B2
Application number	US-201414328575-A
Country	US
Kind code	B2
Filing date	Jul 10, 2014
Priority date	Jun 17, 2014
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A biometric security method and apparatus for a capacitive sensor system is provided herein, where the method may include capturing a set of raw capacitive frames for a body part via the capacitive sensor system, wherein each raw capacitive frame includes a distribution of a plurality of capacitance levels measured from the body part; creating a capacitive profile based on the set of raw capacitive frames; comparing a first value in the capacitive profile to a second value in a biometric template generated from an enrolled body part, wherein the first value and the second value are located at a similar location with respect to the capacitive profile; and, generating an authentication signal based on a difference between the first value and the second value.

First claim

What is claimed is:

1. A biometric authentication apparatus comprising:
a capacitive sensor system configured to capture a set of raw capacitive frames for a body part, wherein each raw capacitive frame includes a distribution of a plurality of capacitance levels measured from the body part;
means for creating a capacitive profile based on the set of raw capacitive frames; and
a processing system configured to:
compare a first value determined from a sum of capacitive sensor measurements captured by a row of a capacitive sensor array to a second value in a biometric template generated from an enrolled body part, wherein the first value and the second value are located at a similar location with respect to the capacitive profile; and
generate an authentication signal based on a difference between the first value and the second value.

2. The biometric authentication apparatus of claim 1 , wherein the means for creating the capacitive profile based on the set of raw capacitive frames is configured to combine the set of raw capacitive frames to create a combined capacitive frame comprising a distributed plurality of averaged capacitance levels, each of the averaged capacitive levels being an average of all capacitance levels for a respective location across all raw capacitive frames in the set of capacitive frames.

3. The biometric authentication apparatus of claim 1 , wherein the authentication signal indicates a reasonable match has been determined between the capacitive profile and the biometric template.

4. The biometric authentication apparatus of claim 1 , wherein the authentication signal identifies the body part as the enrolled body part.

5. The biometric authentication apparatus of claim 1 , wherein the sum of the capacitive sensor measurements captured by the row of the capacitive sensor array comprises:
a plurality of capacitive sensor measurements taken along one of a vertical direction or a horizontal direction of the capacitive sensor array.

6. The biometric authentication apparatus of claim 1 , wherein the biometric template comprises one or more capacitive profiles, each of the one or more capacitive profiles generated from one or more raw capacitive frames captured by the capacitive sensor system in contact with the enrolled body part.

7. The biometric authentication apparatus of claim 1 , wherein each capacitance level of the plurality of capacitance levels comprises a capacitance level sensed by a capacitive sensing element in the capacitive sensor system.

8. The biometric authentication apparatus of claim 1 , wherein the capacitive sensor system comprises an arrangement of capacitive sensing elements in a particular shape and the plurality of capacitance levels contained in each raw capacitive frame are arranged in accordance with the particular shape.

9. A biometric security method for a capacitive sensor system, the biometric security method comprising:
capturing a set of raw capacitive frames for a body part via the capacitive sensor system, wherein each raw capacitive frame includes a distribution of a plurality of capacitance levels measured from the body part;
creating a capacitive profile based on the set of raw capacitive frames;
comparing a first value determined from a sum of capacitive sensor measurements captured by a row of a capacitive sensor array to a second value in a biometric template generated from an enrolled body part, wherein the first value and the second value are located at a similar location with respect to the capacitive profile; and
generating an authentication signal based on a difference between the first value and the second value.

10. The biometric security method of claim 9 , wherein the creating the capacitive profile based on the set of raw capacitive frames comprises combining the set of raw capacitive frames to create a combined capacitive frame comprising a distributed plurality of averaged capacitance levels, each of the averaged capacitive levels being an average of all capacitance levels for a respective location across all raw capacitive frames in the set of capacitive frames.

11. The biometric security method of claim 9 , wherein the authentication signal indicates a reasonable match has been determined between the capacitive profile and the biometric template.

12. The biometric security method of claim 9 , wherein the authentication signal identifies the body part as the enrolled body part.

13. The biometric security method of claim 9 , wherein the sum of the capacitive sensor measurements captured by the row of the capacitive sensor array comprises a plurality of capacitive sensor measurements taken along one of a vertical direction or a horizontal direction of the capacitive sensor array.

14. The biometric security method of claim 9 , wherein the biometric template comprises one or more capacitive profiles, each of the one or more capacitive profiles generated from one or more raw capacitive frames captured by the capacitive sensor system in contact with the enrolled body part.

15. The biometric security method of claim 9 , wherein each capacitance level of the plurality of capacitance levels comprises a capacitance level sensed by a capacitive sensing element in the capacitive sensor system.

16. The biometric security method of claim 9 , wherein the capacitive sensor system comprises an arrangement of capacitive sensing elements in a particular shape and the plurality of capacitance levels contained in each raw capacitive frame are arranged in accordance with the particular shape.

17. A biometric security apparatus comprising:
a capacitive sensor system configured to capture a set of raw capacitive frames for a body part, wherein each raw capacitive frame includes a distribution of a plurality of capacitance levels measured from the body part; and,
a processor coupled to the capacitive sensor system to receive the set of raw capacitive frames, the processor configured to:
create a capacitive profile based on the set of raw capacitive frames;
compare a first value determined from a sum of capacitive sensor measurements captured by a row of a capacitive sensor array in the capacitive profile to a second value in a biometric template generated from an enrolled body part, wherein the first value and the second value are located at a similar location with respect to the capacitive profile; and
generate an authentication signal based on a difference between the first value and the second value.

18. The biometric security apparatus of claim 17 , wherein the processor is further configured to:
combine the set of raw capacitive frames to create a combined capacitive frame comprising a distributed plurality of averaged capacitance levels, each of the averaged capacitive levels being an average of all capacitance levels for a respective location across all raw capacitive frames in the set of capacitive frames.

19. The biometric security apparatus of claim 17 , wherein the authentication signal indicates a reasonable match has been determined between the capacitive profile and the biometric template.

20. The biometric security apparatus of claim 17 , wherein the authentication signal identifies the body part as the enrolled body part.

21. The biometric security apparatus of claim 17 , wherein the sum of the capacitive sensor measurements captured by the row of the capacitive sensor array comprises a plurality of capacitive sensor measurements taken along one of a vertical direction or a horizontal direction of the capacitive sensor arr

Assignees

• Qualcomm Inc

Inventors

• Gooding Ted Ray
• Tartz Robert Scott
• Vartak Aniket

Classifications

• G06F21/32 Primary

  using biometric data, e.g. fingerprints, iris scans or voiceprints · CPC title

• G06F40/186

  Templates · CPC title

• G06F3/04883

  for inputting data by handwriting, e.g. gesture or text · CPC title

• H04L67/303

  Terminal profiles · CPC title

• G06V10/507

  Summing image-intensity values; Histogram projection analysis · CPC title