Patent ID: 8434868
Filing Date: 2013-05-07
Classification: A61B,G06K

Abstract:
1. An eye-gaze tracking device which detects a gaze direction of a user based on an electro-oculogram, said eye-gaze tracking device comprising: a drift estimating unit configured to estimate drift noise included in a set of observation voltages among observation voltages that are electro-oculograms generated in a living body and observed at the plurality of electrodes, based on a component outside an electro-oculography subspace that is an assembly of sets of electro-oculograms theoretically observed at a plurality of electrodes; and an eye-gaze tracking unit configured to detect the gaze direction of the user, based on a signal generated by removing, from the observation voltages, the drift noise estimated by said drift estimating unit, wherein the electro-oculography subspace is obtained by mapping a point in a gaze vector space in accordance with a predetermined electro-oculography conversion function, the point indicating the gaze direction of the user within a predetermined range, the electro-oculography conversion function is a nonlinear function, and the nonlinear function is a function for calculating a theoretical value of the electro-oculogram generated at an arbitrary three-dimensional spatial position, based on: a right-eye corneal distance and a right-eye retinal distance each of which is a distance to the arbitrary three-dimensional spatial position from a corresponding one of a right eye cornea and a right eye retina; and a left-eye corneal distance and a left-eye retinal distance each of which is a distance to the arbitrary three-dimensional spatial position from a corresponding one of a left eye cornea and a left eye retina.