Portable eye tracking device

Patent metadata

Field	Value
Publication number	US-9710058-B2
Application number	US-201414281676-A
Country	US
Kind code	B2
Filing date	May 19, 2014
Priority date	Sep 3, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A portable eye tracker device is disclosed which includes a frame, at least one optics holding member, and a control unit. The frame may be adapted for wearing by a user. The at least one optics holding member may include at least one illuminator configured to selectively illuminate at least a portion of at least one eye of the user, and at least one image sensor configured to capture image data representing images of at least a portion of at least one eye of the user. The control unit may be configured to control the at least one illuminator for the selective illumination of at least a portion of at least one eye of the user, receive the image data from the at least one image sensor, and calibrate at least one illuminator, at least one image sensor, or an algorithm of the control unit.

First claim

What is claimed is:

1. A portable eye tracker device comprising:
a frame adapted for wearing by a user;
at least one optics holding member, wherein the optics holding member comprises:
at least one illuminator configured to selectively illuminate at least a portion of at least one eye of the user; and
at least one image sensor configured to capture image data representing images of at least a portion of at least one eye of the user; and

a control device configured to:
control the at least one illuminator for the selective illumination of at least a portion of at least one eye of the user;
receive the image data from the at least one image sensor;
calibrate at least one illuminator, at least one image sensor, or an algorithm of the control device, wherein the algorithm of the control device is stored in a memory device and executable by a processor to determine a gaze target area; and
determine the gaze target area for the user based at least in part on the image data.

2. The portable eye tracker device of claim 1 , further comprising:
a scene camera facing away from the user and configured to capture image data representing images of at least a portion of the user's field of view.

3. The portable eye tracker device of claim 2 , wherein the control device is further configured to:
determine the gaze target area within the image data representing images of at least a portion user's field of view wherein the gaze target area comprises less than ten percent of the image data in an image from the scene camera; and
control the scene camera to adjust at least one of focus or light sensitivity based on the gaze target area.

4. The portable eye tracker device of claim 2 , wherein the control device is further configured to:
receive image data from the scene camera;
determine, automatically, a specific pattern or item is within the image data received from the scene camera; and
calibrate at least one illuminator, at least one image sensor, or the algorithm of the control device based at least in part on the image data having the specific pattern or item.

5. The portable eye tracker device of claim 4 , wherein the specific pattern is displayed on a printed medium or provided by a display device.

6. The portable eye tracker device of claim 1 , wherein calibrating at least one of the plurality of illuminators or at least one of the plurality of image sensors comprises a selection from a group consisting of:
adjusting a brightness of at least one illuminator;
determining an offset between a calculated gaze direction and an actual gaze direction;
determining a value of a parameter used by the algorithm of the control device;
adjusting a wavelength of light produced by at least one illuminator;
adjusting a sensitivity of at least one image sensor;
adjusting a focus of at least one image sensor; and
changing at least one parameter of the algorithm of the control device.

7. The portable eye tracker device of claim 1 , further comprising:
a movement sensor configured to determine movement of the frame.

8. The portable eye tracker device of claim 1 , wherein the control device is further configured to:
calibrate at least one illuminator, at least one image sensor, or a value of a parameter used by the algorithm of the control device.

9. The portable eye tracker device of claim 7 , wherein the control device is further configured to:
determine the gaze target area for the user further based at least in part on the image data and information received from the movement sensor.

10. The portable eye tracker device of claim 1 , wherein the control device is further configured to:
control at least one of illuminator to selectively illuminate at least a portion of at least one eye of the user using a light of a first wavelength;
receive a first set of image data from at least one image sensor, wherein the first set of image data represents images of at least a portion of at least one eye of the user captured when the user's eye is exposed to the light of the first wavelength;
determine that the gaze target area cannot be determined based on the first set of image data;
receive information about ambient light illuminating at least a portion of at least one of the user;
determine a second wavelength based on the information about the ambient light, wherein the second wavelength is the same or different than the first wavelength;
control at least one of illuminator to selectively illuminate at least a portion of at least one eye of the user using a light of a second wavelength;
receive a second set of image data from at least one image sensor, wherein the second set of image data represents images of at least a portion of at least one eye of the user captured when the user's eye is exposed to the light of the second wavelength; and
determine the gaze target area for the user based at least in part on the second set of image data.

11. The portable eye tracker device of claim 1 , wherein the control device is further configured to:
control a first subset of the at least one illuminator to selectively illuminate at least a portion of at least one eye of the user;
receive a first set of image data from at least one image sensor of the first subset, wherein the first set of image data represents images of at least a portion of at least one eye of the user captured when at least one eye of the user is exposed to light from the first subset of the at least one illuminator;
determine that the gaze target area cannot be determined based on the first set of image data;
control a second subset of the at least one illuminator to selectively illuminate at least a portion of at least one eye of the user;
receive a second set of image data from at least one image sensor of the second subset, wherein the second set of image data represents images of at least a portion of at least one eye of the user captured when at least one eye of the user is exposed to light from the second subset of the at least one illuminator; and
determine the gaze target area for the user based at least in part on the second set of image data.

12. The portable eye tracker device of claim 1 , wherein:
the portable eye tracker device further comprises a positioning device configured to determine a position of the portable eye tracker device; and
the control device is further configured to determine the gaze target area for the user based at least in part on the image data and information received from the positioning device.

13. The portable eye tracker device of claim 1 , wherein the control device is further configured to:
receive image data from at least one image sensor;
determine a level of ambient light from the image data;
adjust a brightness or exposure time of at least one illuminator based at least in part on the level of ambient light.

14. The portable eye tracker device of claim 1 , further comprising:
a display viewable by the user.

15. The portable eye tracker device of claim 1 , wherein the control device is further configured to:
receive image data from at least one image sensor representing images including areas besides the user's eyes.

16. A method of determining a gaze direction for a user, comprising:
activating, with a control device, at least one illuminator on a frame worn by a user to selectively illuminate at least a portion of at least one of the user's eyes;
receiving, with the control device, image data representing images at least a portion of at least one of the user's eyes from at least one image sensor on the frame;
calibrating, with the control device, at

Assignees

• Tobii Ab

Inventors

• Gustafsson Simon
• Kingbäck Anders
• Cederlund Markus

Classifications

• H04N23/56

  provided with illuminating means · CPC title

• H04R1/32

  for obtaining desired directional characteristic only {(specially adapted for hearing aids H04R25/40)} · CPC title

• G06T7/74

  involving reference images or patches · CPC title

• G02B27/017

  Head mounted · CPC title

• G06T2207/10152

  Varying illumination · CPC title