System and method for automatically adjusting a lens power through gaze tracking

• US 6,478,425 B2
• Filed: 12/29/2000
• Issued: 11/12/2002
• Est. Priority Date: 12/29/2000
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Trajkovic, Miroslav, Gutta, Srinivas, Colmenarez, Antonio J.
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US09/752,742
• Publication Number:
  US 20020113943A1
• Time in Patent Office: 683 Days
• Field of Search: 351/209, 351/210, 351/155, 351/57, 359/407, 359/422, 359/432, 359/696, 359/362, 359/368
• US Class Current: 351/209
• CPC Class Codes: A61B 3/113 for determining or recording eye movement
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 7/102 controlled by a microcomputer cameras with interchangeable lenses G03B17/14
• CPC Class Codes: G06V 40/19 Sensors therefor

Abstract

The present invention relates to a device containing an automatic zoom lens, and more particularly to a zoom lens that is controlled by a processor that is linked to a gaze tracking system. As a user looks onto an object through the device, the gaze tracking system collects data relating to the position of each eye of the user. This eye position data is input into the processor where the focal point of the user is determined. The processor then adjusts the zoom lens to zoom in or out onto the object based on either a predetermined or user input zoom factor.

Claims

1. An optical system comprising at least one adjustable optical element, a motor that interfaces with the at least one adjustable optical element to provide adjustment thereto, first and second eye position sensors that detect eye position data for a viewer'"'"'s first and second eye, respectively, a control unit that receives position data from the at first and second eye position sensors and provides control signals to the motor, the control unit including:

i) gaze tracking processing that determines gaze angles for each of the viewer'"'"'s eyes from eye position data provided by the first and second eye position sensors,

ii) gaze distance processing that determines the gaze distance of the viewer using the determined gaze angles,

iii) optical element positioning processing that determines an adjustment position of the at least one optical element a function of the determined gaze distance,

the control unit providing control signals to the motor to move the at least one adjustable optical element to the adjustment position.

2. The optical system as in claim 1, wherein the at least one adjustable optical element is at least one lens that provides a focus to a user of the optical system.

3. The optical system as in claim 2, wherein the at least one lens is a zoom lens.

4. The optical system as in claim 1, wherein the first and second eye position sensors are first and second cameras directed at the first and second eyes, respectively, of the viewer.

5. The optical system as in claim 4, wherein the eye position data of the first and second eyes detected by the first and second cameras, respectively, are images of the first and second eyes.

6. The optical system as in claim 5, wherein the gaze tracking processing of the control unit determines gaze angle for the each of the first and second eye using the position of a feature of the first and second eyes in the images.

7. The optical system as in claim 6, wherein the gaze distance processing determines the gaze distance D of the viewer according to the equation

8. The optical system as in claim 1, wherein the optical element positioning processing determines a default distance from the gaze distance of the viewer, the adjustment position of the at least one optical element being a function of the default distance.

9. The optical system as in claim 8, wherein the at least one optical element is a zoom lens, the default distance is a default zoom distance to which the gaze distance is zoomed, the adjustment position being the location of the at least one optical element that that zooms an object at the gaze distance to the default zoom distance.

10. The optical system as in claim 9, wherein the control unit automatically provides control signals to the motor to move the at least one adjustable optical element to the adjustment position without user input.

11. The optical system as in claim 10, wherein the control unit controls the motor to provide a further adjustment of the zoom lens to subsequent zoom tick positions upon detection of a voice command of the viewer.

12. The optical system as in claim 1, wherein the optical element positioning processing receives an input distance from the viewer, the adjustment position of the at least one optical element being a function of the input distance.

13. The optical system as in claim 12, wherein the at least one optical element is at least one zoom lens, the input distance is a zoom distance to which the user desires the gaze distance to be zoomed, the adjustment position being the location of the at least one zoom lens that zooms an object at the gaze distance to the input zoom distance.

14. The optical system as in claim 13, wherein the control unit provides control signals to the motor to move the at least one zoom lens to the location that zooms an object at the gaze distance to the input zoom distance.

15. The optical system as in claim 13, wherein the control unit receives the input zoom distance from the viewer by voice input.

16. The optical system as in claim 13, wherein the control unit controls the motor to provide a further adjustment of the zoom lens to subsequent zoom tick positions upon detection of a voice command of the viewer.