Method and apparatus for determining a physiological parameter using a fingerprint sensor on a portable electronic device

• US 8,605,961 B2
• Filed: 03/30/2009
• Issued: 12/10/2013
• Est. Priority Date: 03/30/2009
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Schuler, Francesca, Ahmed, Mohamed I., Jonnalagadda, Krishna
• Primary Examiner(s): STREGE, JOHN B
• Application Number:
  US12/413,942
• Publication Number:
  US 20100245553A1
• Time in Patent Office: 1,716 Days
• Field of Search: 382/124, 382/128
• US Class Current: 382/124
• CPC Class Codes: G06V 40/12 Fingerprints or palmprints

Abstract

A method (300) and apparatus (200) that determines a physiological parameter using a fingerprint sensor on a portable electronic device is disclosed. The method can include capturing (320) a plurality of images corresponding to an area beneath a surface of skin using a fingerprint sensor configured to capture a live scan of a fingerprint pattern from a finger on a touch surface on a portable electronic device. The method can include comparing (330) image characteristics corresponding to at least a first image of the plurality of images with image characteristics corresponding to at least a second image of the plurality of images. The method can include determining (340) a physiological parameter based on comparing the image characteristics.

Claims

1. A method comprising:

capturing a plurality of images corresponding to an area beneath a surface of skin using a fingerprint sensor configured to capture a live scan of a fingerprint pattern from a finger on a touch surface on a portable electronic device;

comparing image characteristics corresponding to at least a first image of the plurality of images with image characteristics corresponding to at least a second image of the plurality of images; and

determining a physiological parameter based on comparing the image characteristics,

wherein the method further comprises;

operating the fingerprint sensor in a fingerprint reader mode including capturing a live scan of a fingerprint pattern from a finger on the touch surface to authenticate a user of the portable electronic device;

operating the fingerprint sensor at a first number of frames per second to authenticate a user of the portable electronic device;

changing fingerprint sensor parameters to switch the fingerprint sensor from the fingerprint reader mode to a physiological parameter determination mode; and

increasing the first number of frames per second to a second number of frames per second to operate the fingerprint sensor as a physiological parameter monitor, and

wherein the physiological parameter comprises a heart rate or oxygen consumption.

2. The method according to claim 1, further comprising:

operating the fingerprint sensor at a first focal point at substantially the surface of skin on the touch surface to authenticate a user of the portable electronic device; and

operating the fingerprint sensor at a second focal point corresponding to an area at a distance beneath the surface of skin to operate the fingerprint sensor as a physiological parameter monitor.

3. The method according to claim 2, wherein the area at a distance beneath the surface of the skin includes one or more capillaries.

4. The method according to claim 1, further comprising:

operating the fingerprint sensor at a first exposure time to authenticate a user of the portable electronic device; and

increasing the exposure time to a second exposure time to operate the fingerprint sensor as a physiological parameter monitor.

5. The method according to claim 1, wherein comparing image characteristics comprises comparing differences between image characteristics corresponding to at least the first image of the plurality of images and image characteristics corresponding to at least the second image of the plurality of images.

6. The method according to claim 1, further comprising identifying a user of the portable communication device based on information corresponding to the image characteristics.

7. The method according to claim 1,

wherein comparing image characteristics comprises comparing image characteristics corresponding to a first intensity of at least the first image with image characteristics corresponding to a second intensity of at least the second image, and

wherein a difference between the first intensity and the second intensity correspond to changes in density of blood flow.

8. The method according to claim 1, further comprising creating a plurality of binary images based on the plurality of captured images, where the plurality of binary images contain information corresponding to pixels exceeding a threshold,

wherein comparing image characteristics comprises comparing image characteristics corresponding to at least a first binary image with image characteristics corresponding to at least a second binary image.

9. The method according to claim 8, wherein creating a plurality of binary images includes extracting raw Bayer images based on the plurality of captured images.

10. The method according to claim 8, further comprising reducing dimensional content of the plurality of binary images to generate reduced dimension information,

wherein comparing image characteristics comprises comparing image characteristics corresponding to the reduced dimension information based on at least the first binary image with image characteristics corresponding the reduced dimension information based on at least the second binary image.

11. The method according to claim 10, wherein reducing the dimensional content of the plurality of binary images comprises summing a number of pixels exceeding the threshold for each image of the plurality of binary images to generate reduced dimension information for each image.

12. The method according to claim 1, further comprising displaying the physiological parameter on a display on the portable electronic device.

13. The method according to claim 1, further comprising storing data corresponding to the physiological parameter.

14. The method according to claim 1, further comprising wirelessly transmitting data corresponding to the physiological parameter across a cellular communications network to a server.

18. The method according to claim 1, wherein the physiological parameter comprises a blood related physiological health parameter.

19. The method according to claim 18, wherein a blood related physiological health parameter further comprises one of a maximal oxygen consumption and blood oxygenation.

15. An apparatus comprising:

a portable electronic device housing;

a fingerprint sensor coupled to the portable electronic device housing, the fingerprint sensor configured to capture a live scan of a fingerprint pattern from a finger on a touch surface; and

a controller coupled to the portable electronic device housing and coupled to the fingerprint sensor, the controller including;

an image capture module configured to capture a plurality of images corresponding to an area beneath a surface of skin using the fingerprint sensor;

an image comparison module configured to compare image characteristics corresponding to at least a first image of the plurality of images with image characteristics corresponding to at least a second image of the plurality of images; and

a physiological parameter determination module configured to determine a physiological parameter based on comparing the image characteristics,

wherein the controller is configured to operate the fingerprint sensor in a fingerprint reader mode including capturing a live scan of a fingerprint pattern from a finger on the touch surface to authenticate a user of the apparatus and configured to change fingerprint sensor parameters to switch the fingerprint sensor from the fingerprint reader mode to a physiological parameter determination mode,

wherein the controller is configured to operate the fingerprint sensor at a first number of frames per second to authenticate a user of the apparatus,

wherein the controller is configured to increase the number of frames per second to a second number of frames per second to operate the fingerprint sensor as a physiological parameter monitor, and

wherein the physiological parameter comprises a heart rate or oxygen consumption.

16. The apparatus according to claim 15, further comprising a transceiver coupled to the portable electronic device housing and coupled to the controller, the transceiver configured to wirelessly transmit and receive data across a wireless wide area network.

17. A method comprising:

operating a fingerprint sensor in a fingerprint reader mode including capturing a live scan of a fingerprint pattern from a finger on a touch surface to authenticate a user of a portable electronic device;

changing fingerprint sensor parameters to switch the fingerprint sensor from the fingerprint reader mode to a heart rate determination mode;

capturing a plurality of images corresponding to an area beneath a surface of skin using the fingerprint sensor;

comparing image characteristics corresponding to at least a first image of the plurality of images with image characteristics corresponding to at least a second image of the plurality of images;

determining a heart rate based on comparing the image characteristics; and

outputting data corresponding to the heart rate,

wherein the method further comprises;

operating the fingerprint sensor at a first number of frames per second to authenticate a user of the portable electronic device in the fingerprint reader mode; and

increasing the number of frames per second to a second number of frames per second to operate the fingerprint sensor in the heart rate determination mode.