Line-of-sight detection method and apparatus therefor

A line-of-sight detection method in an imaging system which includes a camera for photographing a face and right and left eyes and a light source for irradiating the right and left eyes with infrared rays, said line-of-sight detection method comprising:

• obtaining a center point of a pupil of at least one of the right and left eyes;
• obtaining a center point of a cornea spherical surface of said at least one of the right and left eyes;
• and
• obtaining a direction of a vector headed from said center point of said cornea spherical surface to said center point of said pupil,
• wherein a data based on a morphological information is used in obtaining said center point of said pupil, and wherein the data based on said morphological information are on the basis of facts that (1) distances from right and left eyes to nose are equal, (2) a ratio of the distance between the right eye and the left eye and the distances from the right and left eyes to the nose is a constant value, and (3) the distance between the right eye and the left eye is constant.