US 11,854,213 B2
Method and system for glint classification
Joakim Zachrisson, Danderyd (SE); Simon Johansson, Danderyd (SE); and Mikael Rosell, Danderyd (SE)
Assigned to Tobii AB, Danderyd (SE)
Filed by Tobii AB, Danderyd (SE)
Filed on Dec. 7, 2021, as Appl. No. 17/544,881.
Claims priority of application No. 2051433-7 (SE), filed on Dec. 8, 2020.
Prior Publication US 2022/0180532 A1, Jun. 9, 2022
Int. Cl. G06T 7/246 (2017.01); G06T 7/73 (2017.01); G02B 3/08 (2006.01); G06F 3/01 (2006.01); H04N 23/56 (2023.01)
CPC G06T 7/246 (2017.01) [G02B 3/08 (2013.01); G06F 3/013 (2013.01); G06T 7/73 (2017.01); H04N 23/56 (2023.01); G06T 2207/30168 (2013.01); G06T 2207/30201 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An eye tracking system comprising:
at least one illuminator; and
at least one image sensor configured to produce an image of an eye of a user, the image including light received from the at least one illuminator reflected from the eye of a user;
the eye tracking system further comprising:
a Fresnel lens positioned between the image sensor and the eye of the user, through which the image sensor views the eye; and
processing circuitry configured to:
receive an image from the image sensor;
identify glints in the image;
assign an angular position to each glint based on an angular relationship between each glint and a centers of the Fresnel lens, wherein each angular position is provided as a discrete angular range;
determine how many glints have the same angular position; and
classify a glint as a false glint if more than a predetermined number of glints have the same angular position; and
exclude the false glint during further processing of the eye tracking system.