Patent ID: 7401920
Filing Date: 2008-07-22
Classification: A61B,G02B,G06K

Abstract:
1. System for tracking the eye of a user, the system comprising: an image detector, directed at said eye, for detecting an eye image of at least said eye; at least one pupil-illuminating light source, each said at least one pupil-illuminating light source emitting a respective pupil-illuminating light beam, each said pupil-illuminating light beam having at least a portion being directed at the pupil of said eye, the portion being aligned with the optical axis of said image detector and at least partially illuminating the pupil of said eye; at least one reference light source that differs from said pupil-illuminating light source, each said at least one reference light source emitting a respective reference light beam, for illuminating a portion of the face of said user; and an imaging processor, coupled with said image detector, for analyzing said eye image, wherein at least a portion of each of said at least one pupil-illuminating light beam is reflected towards said image detector, thereby indicating a pupil region in said eye image, said pupil region being associated with said pupil, wherein at least a portion of each of said at least one reference light beam is reflected towards said image detector, thereby indicating at least one reference region in said eye image, each said reference region being associated with a recognizable portion of the face, wherein said imaging processor identifies said pupil region and at least one of said at least one reference region, and wherein said imaging processor determines the line of sight of said user according to said pupil region and according to at least one of said at least one reference region.