Visual line detection device and visual line detection program

A gaze detection program for detecting a gaze direction of an eye, the program making a computer executes steps of:

• illuminating the eye from a plurality of light sources, and determining a state of a bright spot observed on a cornea of an eye;
• if the state is in a first state,
• (1-1) identifying a position of a center of the cornea based on a plurality of the bright spots;
• (1-2) identifying a position of a pupil of the eye based on the image of the eye,
• (1-3) identifying a gaze direction based on the position of the center of the cornea and the position of the pupil;
• on the other hand, if the state of the bright spot observed on the cornea of the eye based on the plurality of light sources is a second state,
• (2-1) identifying a shape of an eyeball according to data of a radius of the eyeball stored in a storage unit and the position of the center of the eyeball;
• and
• (2-2) identifying the gaze direction from the image of the eye and the position of the center of the eyeball.

A head mount display comprising:

• a housing mounted on a head of a user;
• and a gaze detection device mounted on the housing for detecting a gaze direction of the user,
• wherein the gaze detection device comprises:
• a plurality of light sources that illuminate an eye of the user;
• an imaging device for imaging an image of the eye;
• and
• a processor,

Wherein the processor:

• if bright spots observed on a cornea of the eye based on the plurality of light sources are in a first state,
• (1-1) identifies a position of a center of the cornea based on the bright spots;
• (1-2) identifies a position of a pupil of the eye based on an image of the imaging device;
• and
• (1-3) identifies the gaze direction based on the position of the center of the cornea and the position of the pupil, and
• if the bright spots observed on the cornea of the eye based on the plurality of light sources are in a second state,
• (2-1) identifies a shape of the eye according to data of a radius of the eye and the position of the center of the eye stored in the storage section;
• and
• (2-2) identifies the gaze direction from the image of the imaging device and the position of the center of the eyeball.