METHOD FOR ESTIMATING THE COORDINATES OF THE EYE CORNEA CENTER IN THE SYSTEM FOR DETERMINING THE GAZE DIRECTION
G. I. Gromilin, V. P. Kosykh, N. S. Yakovenko
Institute of Automation & Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: non-contact determination of the gaze direction, glare on cornea, 3D coordinates of the cornea center, 3D model of the eye
Abstract
In a number of systems for non-contact tracking of the gaze direction based on video data generated by a video camera, the gaze direction is determined by the mutual position of the centers of the pupil and the cornea of the eye. In the camera coordinate system, the three-dimensional coordinates of the cornea center can be calculated from the positions of glares created on the cornea surface by point sources of IR radiation rigidly connected to the camera. The paper considers a new method for estimating the three-dimensional coordinates of the cornea center from images of glares, generated by a pair of point radiation sources. It is shown that the problem comes down to solving one nonlinear equation, where the distance between the eye and the camera is much greater than the radius of the cornea. We present an iterative algorithm for estimating the coordinates of the cornea center, which ensures low computational costs. The results of the numerical experiment confirm the preservation of the estimates accuracy.
|
