US 12,250,463 B2
Dynamic camera rotation calibration
Simon Johansson, Danderyd (SE); and Mikael Rosell, Danderyd (SE)
Assigned to Tobii AB, Danderyd (SE)
Filed by TOBII AB, Danderyd (SE)
Filed on Mar. 29, 2023, as Appl. No. 18/127,718.
Claims priority of application No. 2250403-9 (SE), filed on Mar. 31, 2022.
Prior Publication US 2023/0319417 A1, Oct. 5, 2023
Int. Cl. H04N 23/695 (2023.01); G02B 27/01 (2006.01); G06F 3/01 (2006.01); G06V 40/18 (2022.01)
CPC H04N 23/695 (2023.01) [G02B 27/017 (2013.01); G06F 3/013 (2013.01); G06V 40/193 (2022.01); G06V 2201/07 (2022.01)] 18 Claims
OG exemplary drawing
 
1. A method for calibrating an eye tracking camera of an eye tracking system, the method comprising the steps of:
a) capturing an eye image of a user, wherein the eye image contains a plurality of glints created by a plurality of illuminators in the eye tracking system,
b) detecting glints in the eye image,
c) projecting illuminator positions onto the eye image to determine expected glint positions,
d) determining an angular offset between the expected glint positions and detected glint positions for corresponding pairs of expected and detected glint positions,
e) determining the angular correction for the eye tracking camera using the determined angular offset angle, and
f) applying the angular correction for the eye tracking camera to an eye tracker camera model.