The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2026
Filed:
Jun. 21, 2023
Tobii Ab, Danderyd, SE;
Peter Blixt, Danderyd, SE;
Mårten Selin, Danderyd, SE;
Tobii AB, Danderyd, SE;
Abstract
Method for determining calibration information in relation to a digital camera used to depict a user in a system for determining a user gaze point in relation to an entity, the method comprising: receiving from the camera at least one image of a user; performing digital image processing on the image to determine an in-image feature size dimension of a feature of the entity as reflected in an eye of the user; and to determine an in-image limbus size dimension of a limbus of the eye; determining a current distance between the eye and the entity based on said in-image size dimensions, a curvature of the eye cornea, a physical limbus size and a physical feature size; and determining said calibration information in the form of a focal length and/or a field of view of the camera based on said current distance and said physical limbus size dimension.