Determining eye openness with an eye tracking device
A method for determining eye openness with an eye tracking device is disclosed. The method may include determining, for pixels of an image sensor of an eye tracking device, during a first time period when an eye of a user is open, a first sum of intensity of the pixels. The method may also include determining, during a second time period when the eye of the user is closed, a second sum of intensity of the pixels. The method may further include determining, during a third time period, a third sum of intensity of the pixels. The method may additionally include determining that upon the third sum exceeding a fourth sum of the first sum plus a threshold amount, that the eye of the user is closed, the threshold amount is equal to a product of a threshold fraction and a difference between the first sum and the second sum.
1. A method for determining eye openness with an eye tracking device, wherein the method comprises:
receiving, at one or more processors, an image of an eye of a user from an image sensor of an eye tracking device;
determining, with the one or more processors, based on the image of the eye, a radius of the pupil;
determining, with the one or more processors, based on the radius of the pupil, a total area of the pupil;
determining, with the one or more processors, based on the image of the eye and the radius of the pupil, an amount of the total area of the pupil which is not obscured by either eyelid; and
determining, with the one or more processors, based on the amount of the total area of the pupil which is not obscured by the eyelid and the total area of the pupil, whether the eye of the user is closed.
2. The method for determining eye openness with an eye tracking device of claim 1 , wherein:
when the total area of the pupil which is not obscured is greater than a remainder of the pupil, the eye of the user is open.
3. The method for determining eye openness with an eye tracking device of claim 1 , wherein:
when the total area of the pupil which is not obscured is less than a remainder of the pupil, the eye of the user is closed.
4. The method for determining eye openness with an eye tracking device of claim 1 , wherein the method further comprises:
determining, with the one or more processors, based on the image of the eye, that a center of the pupil is obscured by either eyelid; and
determining, with the one or more processors, based on the center of the pupil being obscured by either eyelid, that the eye of the user is closed.
5. The method for determining eye openness with an eye tracking device of claim 1 , wherein the method further comprises:
determining, with the one or more processors, based on the image of the eye, a maximum openness over time between either eyelid; and
determining, with the one or more processors, whether the eye of the user is closed, based on the maximum openness over time.
6. The method for determining eye openness with an eye tracking device of claim 5 , wherein determining whether the eye of the user is closed based on the maximum openness over time comprises:
determining, based on the image of the eye, that an openness of the eye is less than a predefined proportion of the maximum openness over time.
7. A computer-readable medium storing instructions that, when executed on a computer, carry out the method of claim 1 .
8. A system for determining eye openness with an eye tracking device, the system comprising a processor configured to:
receive an image of an eye of a user from an image sensor of an eye tracking device;
determine , based on the image of the eye, a radius of the pupil;
determine, based on the radius of the pupil, a total area of the pupil;
determine, based on the image of the eye and the radius of the pupil, an amount of the total area of the pupil which is not obscured by either eyelid; and
determine, based on the amount of the total area of the pupil which is not obscured by the eyelid and the total area of the pupil, whether the eye of the user is closed.
9. The system of claim 8 , wherein the processor is further configured to determine that, when the total area of the pupil which is not obscured is greater than a remainder of the pupil, the eye of the user is open.
10. The system of claim 8 , wherein the processor is further configured to determine that, when the total area of the pupil which is not obscured is less than a remainder of the pupil, the eye of the user is closed.
11. The system of claim 8 , wherein the processor is further configured to:
determine, based on the image of the eye, that a center of the pupil is obscured by either eyelid; and
determine, based on the center of the pupil being obscured by either eyelid, that the eye of the user is closed.
12. The system of claim 8 , wherein the processor is further configured to:
determining, with the one or more processors, based on the image of the eye, a maximum openness over time between either eyelid; and
determine whether the eye of the user is closed, based on the maximum openness over time.
13. The system of claim wherein the processor is further configured to:
determine whether the eye of the user is closed based on the maximum openness over time by determining, based on the image of the eye, that an openness of the eye is less than a predefined proportion of the maximum openness over time.