US 11,676,422 B2
Devices, systems and methods for predicting gaze-related parameters
Kai Dierkes, Berlin (DE); and Moritz Kassner, Berlin (DE)
Assigned to PUPIL LABS GmbH, Berlin (DE)
Appl. No. 17/612,616
Filed by PUPIL LABS GmbH, Berlin (DE)
PCT Filed Jun. 5, 2019, PCT No. PCT/EP2019/064656
§ 371(c)(1), (2) Date Nov. 19, 2021,
PCT Pub. No. WO2020/244752, PCT Pub. Date Dec. 10, 2020.
Prior Publication US 2022/0206573 A1, Jun. 30, 2022
Int. Cl. G06V 40/18 (2022.01); G06T 7/73 (2017.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01); G06F 3/01 (2006.01); G06V 40/19 (2022.01)
CPC G06V 40/193 (2022.01) [G02B 27/0093 (2013.01); G02B 27/0101 (2013.01); G02B 27/017 (2013.01); G06F 3/013 (2013.01); G06T 7/75 (2017.01); G06V 40/19 (2022.01); G06V 40/197 (2022.01); G02B 2027/0138 (2013.01); G02B 2027/0178 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for generating data suitable for determining a parameter of a human eye comprising an eyeball and an iris defining a pupil, the method comprising:
receiving a first image of the eye for a first time from a camera of known camera intrinsic s and defining an image plane;
determining a first ellipse in the first image, the first ellipse at least substantially representing a border of the pupil at the first time;
using the camera intrinsics and the first ellipse to determine an orientation vector of a first circle and a first center line on which a center of the first circle is located, so that a projection of the first circle, in a direction parallel to the first center line, onto the image plane is expected to reproduce the first ellipse;
determining a first eye intersecting line expected to intersect a center of the eyeball at the first time as a line which is, in the direction of the orientation vector, parallel-shifted to the first center line by an expected distance between the center of the eyeball and a center of the pupil; and
wherein the expected distance between the center of the eyeball and the center of the pupil is an average value, in particular a physiological constant, wherein the orientation vector points away from the camera, wherein the camera de fines a co-ordinate system, wherein at least the respective center lines are determined with respect to the co-ordinate system, wherein the camera is assumed to be substantially immobile with respect to the eye, and/or wherein the center of the eyeball is assumed to have at least substantially non-varying co-ordinates in the co-ordinate system while the respective images of the eye are acquired by the camera.