Patent ID: 11861916
Assignee: YAZAKI CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. The method as recited in claim 1, wherein computing an eye openness measure of the eye of the driver comprises:
obtaining landmark data of the eye;
generating an upper eyelid contour of the eye and a lower eyelid contour of the eye based on the landmark data;
plotting a first line between a first intersection point of the upper eyelid contour and the lower eyelid contour and a second intersection point of the upper eyelid contour and the lower eyelid contour;
dividing the first line into at least four equal segments;
plotting a plurality of second lines, wherein each of the plurality of second lines passes through an intersection point between a different two of the at least four equal segments of the first line, perpendicularly to the first line;
identifying a plurality of landmarks on each of the upper eyelid contour and the lower eyelid contour, the plurality of landmarks comprising each intersection point between a line of the plurality of second lines and either the upper eyelid contour or the lower eyelid contour;
defining a plurality of triangles, such that each of the plurality of triangles has vertices formed by a different 3-tuple of landmarks among the plurality of landmarks, wherein two of the landmarks in each said 3-tuple are located on a different one of the upper eyelid contour and the lower eyelid contour than the third landmark in the 3-tuple;
computing each interior angle of each of the plurality of triangles; and
computing the eye openness measure of the eye as a function of the average of all of the interior angles of the plurality of angles.