Abstract: An object of the present invention is, when determining a line-of-sight vector of a subject, to identify a three-dimensional position of a pupil center or corneal reflection center thereof. The line-of-sight vector is determined by measuring a distance from a camera to the pupil center or corneal reflection center of the subject using a two-dimensional CMOS distance image sensor by a light time-of-flight method and obtaining position information of the pupil center and corneal reflection center of the subject using the distance image sensor. If a position and a direction of the camera are identified, a camera-pupil center vector is determined from image information of the pupil center of the subject. Since the camera-pupil center distance has been measured, a pupil center position in a three-dimensional space is determined from the above information. Combining this with two line-of-sight vectors determines a position where line-of-sight vectors intersect, or a view-point.

Abstract: Method and device for detecting a line-of-sight of a subject and a three-dimensional view-point measurement device. The method uses a first camera, that measures the position of a pupil relative to a coordinate system, a second camera having a light source arranged at a known position in the coordinate system, and forming a corneal reflection center to obtain data of a size of vector r from the corneal reflection center to the pupil center and an angle ? of the vector r relative to a coordinate axis of the coordinate system, and a calculation means for calculating a line-of-sight direction based on information from each camera. In determining a relational formula, a subject is made to gaze at a known point to perform measurement and a relational formula is determined. In a line-of-sight determining stage, the subject is measured again using the relational formula.

Abstract: A method and device for detecting a line-of-sight of a subject and a three-dimensional view-point measurement device are provided. The method for detecting a line-of-sight uses a first camera 10, 11 that measure the position of a pupil relative to a coordinate system, a second camera 12 having a light source arranged at a known position in the coordinate system and forming a corneal reflection center to obtain data of a size of vector r from the corneal reflection center to the pupil center and an angle ? of the vector r relative to a coordinate axis of the coordinate system, and a calculation means for calculating a line-of-sight direction based on information from each of the cameras. In a stage of determining a relational formula, a subject is made to gaze at a known point to perform measurement and a relational formula is determined. In a stage of determining a line-of-sight, the subject is measured again to determine the line-of-sight using the relational formula.

Abstract: An object of the present invention is, when determining a line-of-sight vector of a subject, to identify a three-dimensional position of a pupil center or corneal reflection center thereof. The line-of-sight vector is determined by measuring a distance from a camera to the pupil center or corneal reflection center of the subject using a two-dimensional CMOS distance image sensor by a light time-of-flight method and obtaining position information of the pupil center and corneal reflection center of the subject using the distance image sensor. If a position and a direction of the camera are identified, a camera-pupil center vector is determined from image information of the pupil center of the subject. Since the camera-pupil center distance has been measured, a pupil center position in a three-dimensional space is determined from the above information. Combining this with two line-of-sight vectors determines a position where line-of-sight vectors intersect, or a view-point.