Abstract: A tracking system for use in a display device that has an eye piece per eye. The tracking system includes a plurality of illuminators per eye, arranged along a periphery of the eye piece; and a first camera per eye, arranged at the periphery of the eye piece. A line passing through the first camera and an optical centre of the eye piece forms a first angle lying in a range of 0 degree to 40 degrees with respect to a horizon plane, wherein an optical axis of the eye piece and an inter-optical horizon line lie on the horizon plane, the inter-optical horizon line passing through optical centres of both eye pieces of the display device. The first camera is positioned below the horizon plane.

Abstract: An eye-gaze detection system containing a mounting tool mounted on a user for use, includes: plural illumination units illuminating an eye of the user with invisible light; a camera capturing the eye on the basis of the invisible light; a pupil specifying unit specifying a pupil center of the user from a captured image having been captured; an obtaining unit obtaining information on a position of a center of a corneal curvature of the user on the basis of disposed positions of the illumination units and the camera, and illuminated positions by illumination light emitted from the illumination units to the eye; a vector specifying unit specifying a vector connecting the center of the corneal curvature and the pupil center on the captured image; and a displacement detection unit detecting displacement of a mounting state of the mounting tool mounted on the user on the basis of the vector.

Abstract: An eye-gaze detection system containing a mounting tool mounted on a user for use, includes: plural illumination units illuminating an eye of the user with invisible light; a camera capturing the eye on the basis of the invisible light; a pupil specifying unit specifying a pupil center of the user from a captured image having been captured; an obtaining unit obtaining information on a position of a center of a corneal curvature of the user on the basis of disposed positions of the illumination units and the camera, and illuminated positions by illumination light emitted from the illumination units to the eye; a vector specifying unit specifying a vector connecting the center of the corneal curvature and the pupil center on the captured image; and a displacement detection unit detecting displacement of a mounting state of the mounting tool mounted on the user on the basis of the vector.