Blue light adjustment for biometric security
Systems and methods for blue light adjustment with a wearable display system are provided. Embodiments of the systems and methods for blue light adjustment can include receiving an eye image of an eye exposed to an adjusted level of blue light; detecting a change in a pupillary response by comparison of the received eye image to a first image; determining that the pupillary response corresponds to a biometric characteristic of a human individual; and allowing access to a biometric application based on the pupillary response determination.
1. A system comprising:
a display configured to project light;
a camera configured to capture images of an eye of a user; and
a hardware processor programmed to:
instruct the camera to capture a first image of the eye while the display projects light at a first ratio of intensity of blue light to non-blue light into the eye;
determine a first difference between a first pupil parameter associated with the first image and a target pupil parameter;
based on the first difference, instruct the display to change the first ratio to a second ratio of intensity of blue light to non-blue light;
instruct the camera to capture a second image of the eye while the display projects the second ratio of intensity of blue light to non-blue light;
determine a second difference between a second pupil parameter associated with the second image and the target pupil parameter; and
based on a determination that the second difference is below a target threshold, determine a biometric characteristic of the user.
2. The system of claim 1 , wherein the hardware processor is further programmed to:
determine an identity of the user based at least partly on the determined biometric characteristic.
3. The system of claim 2 , wherein the hardware processor is further programmed to restrict access to a system application based at least partly on a determination that the identity of the user does not match an identity of an individual authorized to use the system application.
4. The system of claim 1 , wherein the display comprises a light field display.
5. The system of claim 1 , wherein the display comprises a plurality of waveguides configured to direct light to the eye to form images in the eye.
6. The system of claim 5 , wherein the display comprises a plurality of waveguides each associated with a corresponding depth plane.
7. The system of claim 6 , wherein each of the plurality of waveguides is associated with one or more colors of the display.
8. The system of claim 1 , wherein the display is configured to modify an intensity of blue light in a wavelength range of between 445 nm and 525 nm.
9. The system of claim 1 , wherein the display is configured to change the first ratio to the second ratio of intensity of blue light to non-blue light by flashing blue light for longer than 10 ms.
10. The system of claim 1 , wherein the display is configured to project light at two or more colors.
11. The system of claim 1 , wherein the hardware processor is further programmed to form an individual biometric model comprising at least one of:
a rise time of a pupillary response to the second ratio of intensity of blue light to non-blue light,
a decay time of the pupillary response to the second ratio of intensity of blue light to non-blue light,
a delay time of the pupillary response to the second ratio of intensity of blue light to non-blue light,
a rise curve of the pupillary response to the second ratio of intensity of blue light to non-blue light, or
a decay curve of the pupillary response to the second ratio of intensity of blue light to non-blue light.
12. The system of claim 1 , wherein the hardware processor is further programmed to calculate a cognitive load based on a pupil parameter that is the first pupil parameter or the second pupil parameter.
13. The system of 12 , wherein the pupil parameter comprises a pupil radius.
14. The system of claim 1 , wherein the hardware processor is further programmed to:
compare the second difference with an expected difference between a pupil parameter of an individual biometric model and the target pupil parameter to generate a cognitive load pupillary response, wherein the expected difference accounts for an expected pupil parameter under a normal cognitive load; and
determine a level of cognitive load based on the cognitive load pupillary response.
15. The system of claim 1 , wherein the hardware processor is further programmed to allow access to a system application of the system based at least partly on the second difference.
16. The system of claim 15 , wherein the hardware processor is further programmed to allow access to the system application further based on at least one of determining a cognitive load, estimating an eye pose, generating an iris code, or determining an emotional response.
17. The system of claim 1 , wherein the second pupil parameter comprises at least one of:
a maximum radius of the pupil,
a minimum radius of the pupil,
a rise time of a pupillary response to a level of an intensity of blue light corresponding to the second ratio,
a decay time of a pupillary response to the level of the intensity of blue light corresponding to the second ratio, or
a delay time of a pupillary response to the level of the intensity of blue light corresponding to the second ratio.