Optical device having line-of-sight detection device

Abstract

Abstract PURPOSE:To make highly precise glance detection by finding a glance by the glance detecting device from a function based upon an observer's pupil diameter and glance correction data. CONSTITUTION:The glance correction data (glance correction coefficient) for correcting a detection error in glance due to the individual difference of the eyeball are collected to form a (calibration) visual field area. A CPU detects the position of a Purkinje image. Plural border points between the pupil and iris are detected as the center position of the pupil and the pupil diameter is also calculated; and the interval between two Purkinje images is calculated from their positions and the coordinates of two points of a diagonal of a rectangle are stored in a glance detecting circuit. The reliability of the calculated positions of the Purkinje images and pupil center is decided on the basis of the contrast of an eyeball image or the size of the pupil. This reliability information is calibration data. Then, the distance between the ocular of a camera and the eyeball is calculated from the interval between the Purkinje images and the angle of rotation of the eyeball optical axis is corrected to find the glance.

Inventors

• 👤 Akihiko Nagano
• 👤 明彦 長野
• 👤 Akira Yamada
• 👤 山田　　晃
• 👤 Yoshiaki Irie
• 👤 良昭 入江

Bibliographic Details