POLARIZED GAZE TRACKING

摘要

Embodiments that relate to determining gaze locations are disclosed. In one embodiment a method includes shining light along an outbound light path to the eyes of the user wearing glasses. Upon detecting the glasses, the light is dynamically polarized in a polarization pattern that switches between a random polarization phase and a single polarization phase, wherein the random polarization phase includes a first polarization along an outbound light path and a second polarization orthogonal to the first polarization along a reflected light path. The single polarization phase has a single polarization. During the random polarization phases, glares reflected from the glasses are filtered out and pupil images are captured. Glint images are captured during the single polarization phase. Based on pupil characteristics and glint characteristics, gaze locations are repeatedly detected.

主权项

1. A method for determining gaze locations of an eye of a user, the method comprising:
shining light along an outbound light path from a light source to the eyes of the user wearing glasses; detecting that the user is wearing glasses using an image captured by an image capture device; upon detecting that the user is wearing glasses, dynamically polarizing the light in a polarization pattern that repeatedly switches between a random polarization phase and a single polarization phase at a rate of at least 60 Hz, wherein the random polarization phase includes a first polarization of the light along the outbound light path intermediate the light source and the glasses of the user and a second polarization orthogonal to the first polarization along a reflected light path intermediate the glasses and the image capture device, and the single polarization phase having a single polarization along one or more of the outbound light path and the reflected light path; during the random polarization phases, filtering out glares reflected from the glasses that would otherwise occlude a pupil of the eye; during the random polarization phases when the glares are filtered out, capturing pupil images at a rate of 30 Hz or higher; during the single polarization phases, capturing glint images at a rate of 30 Hz or higher; and repeatedly detecting the gaze locations at a rate of at least 30 Hz based on pupil characteristics identified in the pupil images and glint characteristics identified in the glint images captured proximate in time to the pupil images.