Augmented reality device and method for detecting gaze of user

1. An augmented reality (AR) device comprising:

a light guide plate;

a vision correction lens overlapping the light guide plate in a gaze direction of a user wearing the AR device;

a support configured to fix the AR device to a face of the user wearing the AR device;

a gaze tracking sensor including a light receiver and a light emitter disposed at a portion of the support;

a light reflector configured to reflect light for gaze tracking; and

at least one processor configured to:

obtain lens characteristic information about the vision correction lens,

emit light toward the light reflector by controlling the light emitter,

obtain an eye image of the user based on light received through the light receiver,

adjust the eye image of the user based on the lens characteristic information, and

obtain gaze information about the user from the adjusted eye image,

wherein the light emitted toward the light reflector is reflected by the light reflector and directed to an eye of the user,

wherein the light received through the light receiver includes light obtained due to the light directed to the eye of the user being reflected by the eye of the user,

wherein the light reflector includes a pattern, and

wherein the at least one processor is further configured to:

emit light for obtaining the lens characteristic information about the vision correcting lens toward the light reflector by controlling the light emitter,

identify a distorted pattern based on the light received through the light receiver, and

obtain the lens characteristic information about the vision correction lens based on the distorted pattern.

2. The AR device of claim 1 , wherein the at least one processor is further configured to:

obtain the lens characteristic information about the vision correction lens by comparing the pattern included in the light reflector with the distorted pattern identified from the light reflected by the light reflector and received through the light receiver.

3. The AR device of claim 1 ,

wherein an indicator used to obtain the lens characteristic information about the vision correction lens is displayed on the vision correction lens, and

wherein the at least one processor is further configured to:

obtain the lens characteristic information about the vision correction lens by identifying the indicator.

4. The AR device of claim 3 , wherein the at least one processor is further configured to:

emit light toward the indicator by controlling the light emitter, and

identify the indicator based on the light received through the light receiver.

5. The AR device of claim 1 ,

wherein the vision correction lens includes a coupler configured to couple with the support of the AR device, and

wherein the at least one processor is further configured to:

apply an electromagnetic signal to the vision correction lens through the coupler, and

obtain, from the vision correction lens, the lens characteristic information about the vision correction lens by obtaining a corresponding electromagnetic return signal in response to the applied electromagnetic signal.

6. The AR device of claim 1 ,

wherein the vision correction lens includes a varifocal lens, and

wherein the at least one processor is further configured to:

set a control parameter for controlling the varifocal lens, and

obtain the lens characteristic information about the vision correction lens based on the set control parameter.

7. The AR device of claim 1 , wherein the at least one processor is further configured to:

obtain a position of at least one preset feature point and a position of a center point from the adjusted eye image, and

obtain the gaze information of the user based on the position of the at least one preset feature point and the position of the center point.

8. A method, performed by an augmented reality (AR) device including a vision correction lens, of detecting a gaze of a user, the method comprising:

obtaining lens characteristic information about the vision correction lens overlapping a light guide plate, the light guide plate being configured to display an image output from the AR device in a gaze direction of the user;

emitting light for gaze tracking toward a light reflector through a light emitter disposed at a portion of a support of the AR device, wherein the emitted light is reflected by the light reflector and then directed to an eye of the user wearing the AR device;

receiving light reflected by the eye of the user through a light receiver disposed at the support;

obtaining an eye image of the user based on the light received through the light receiver;

adjusting the eye image of the user based on the lens characteristic information about the vision correction lens; and

obtaining gaze information about the user based on the adjusted eye image.

9. The method of claim 8 ,

wherein the light reflector includes a pattern, and

wherein the obtaining of the lens characteristic information about the vision correction lens includes:

emitting light for obtaining the lens characteristic information toward the light reflector through the light emitter;

identifying a distorted pattern based on the light received through the light receiver; and

obtaining the lens characteristic information about the vision correction lens based on the distorted pattern.

10. The method of claim 9 , wherein the obtaining of the lens characteristic information about the vision correction lens based on the distorted pattern comprises obtaining the lens characteristic information about the vision correction lens by comparing the pattern included in the light reflector with the distorted pattern identified from the light reflected by the light reflector and received through the light receiver.

11. The method of claim 8 ,

wherein an indicator used to obtain the lens characteristic information about the vision correction lens is displayed on the vision correction lens, and

wherein the obtaining of the lens characteristic information about the vision correction lens comprises:

identifying the indicator; and

obtaining the lens characteristic information about the vision correction lens based on the identified indicator.

12. The method of claim 8 ,

wherein the vision correction lens includes a coupler configured to couple with the support of the AR device, and

wherein the obtaining of the lens characteristic information about the vision correction lens comprises:

applying an electromagnetic signal to the vision correction lens through the coupler;

obtaining, from the vision correction lens, a corresponding electromagnetic return signal in response to the applied electromagnetic signal; and

obtaining the lens characteristic information about the vision correction lens based on the obtained electromagnetic return signal.

13. The method of claim 8 ,

wherein the vision correction lens includes a varifocal lens, and

wherein the obtaining of the lens characteristic information about the vision correction lens comprises:

setting a control parameter for controlling the varifocal lens; and

obtaining the lens characteristic information about the vision correction lens based on the set control parameter.

14. The method of claim 8 , wherein the obtaining of the gaze information about the user based on the adjusted eye image comprises:

obtaining a position of at least one preset feature point and a position of a center point from the adjusted eye image; and

obtaining the gaze information about the user based on the position of the at least one preset feature point and the position of the center point.

15. A non-transitory computer-readable recording medium having recorded thereon a program for performing the method of claim 8 by a computer.

16. The method of claim 8 , wherein the gaze direction of the user is represented by a first value of a first vector from a center of a left eye of the user toward a gaze point and a second value of a second vector from a center of a right eye toward the gaze point.

17. The method of claim 10 , wherein the obtaining of the lens characteristic information about the vision correction lens comprises comparing a position of vertexes on the pattern included in the light reflector with a position of vertexes on the distorted pattern and comparing lengths, positions, directions, and degrees of bending of edges on the pattern included in the light reflector with edges on the distorted pattern.

18. The method of claim 8 , wherein the adjusting of the eye image comprises:

generating a distortion compensation function based on the lens characteristic information about the vision correction lens; and

adjusting the eye image based on the distortion compensation function.