EYELID SHAPE ESTIMATION

摘要

Systems and methods for eyelid shape estimation are disclosed. In one aspect, after receiving an eye image of an eye (e.g., from an image capture device), an eye-box is generated over an iris of the eye in the eye image. A plurality of radial lines can be generated from approximately the center of the eye-box to an upper edge or a lower edge of the eye box. Candidate points can be determined to have local maximum derivatives along the plurality of radial lines. From the candidate points, an eyelid shape curve (e.g., for an upper eyelid or a lower eyelid) can be determined by fitting a curve (e.g., a parabola or a polynomial) to the candidate points or a subset of the candidate points.

主权项

1. A method for eyelid shape estimation, comprising:
under control of a hardware processor: generating an eye-box over an eye in an eye image,
wherein the eye-box is rectangular in shape with an upper edge and a lower edge,wherein the upper edge overlays a portion of an upper eyelid of the eye, andwherein the lower edge overlays a portion of a lower eyelid of the eye; generate a plurality of radial lines extending from approximately the center of the eye-box to the upper edge or the lower edge, determining candidate points on the plurality of radial lines using an edge detector; determining a parabolic fit curve from a subset of the candidate points, wherein the parabolic fit curve is an estimation of an eyelid shape of the eye in the eye image; determining a score of the parabolic fit curve is above a threshold score; and determining that the parabolic fit curve is a preferred estimation of the eyelid shape of the eye in the eye image.