Patent ID: 11941835
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  A | IPC G

Claim 1:
2. The eye information estimate apparatus according to claim 1,
wherein the calculating the center coordinates (xc, yc) and the angle of rotation ψ and/or the length Rb further comprises:
calculating, using the coordinates (x1, y0) and (x2, y0) of the point P1 and the point P2 respectively and the slopes θ1 and θ2 of the tangent lines of the ellipse at the point P1 and the point P2 respectively, coordinates (xs, ys) of an intersection C of the tangent lines; and
finding a hyperparameter α (where |α| ≤1) using the coordinates (x1, y0) and (x2, y0) of the point P1 and the point P2 respectively and the coordinates (xs, ys) of the intersection C to calculate the center coordinates (xc, yc) and the angle of rotation ψ of the ellipse, and/or the length Rb of the minor axis of the ellipse.