US 12,355,216 B2
Three-dimensional (3D) compressive sensing based eye tracking
Yatong An, Redmond, WA (US); Youmin Wang, Bellevue, WA (US); and Zhaoyu Nie, Kenmore, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Dec. 22, 2022, as Appl. No. 18/087,322.
Prior Publication US 2024/0213746 A1, Jun. 27, 2024
Int. Cl. H01S 5/42 (2006.01); G01B 11/25 (2006.01)
CPC H01S 5/423 (2013.01) [G01B 11/2513 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eye tracking system, comprising:
a projector to project a sequence of active encoded illumination patterns onto a surface of an eye of a user;
a single-photon avalanche diode (SPAD) based sensor system to capture reflections of the active encoded illumination patterns from the surface of the eye; and
a processor to:
synchronize a rate of the projector projecting the active encoded illumination patterns with a rate of the SPAD based sensor system capturing the reflections of the active encoded illumination patterns;
employ compressive sensing to process the captured reflections of the active encoded illumination patterns to obtain high resolution images from the captured reflections; and
determine three-dimensional (3D) features of the surface of the eye from the high resolution images, wherein the 3D features of the surface of the eye are used to determine a gaze of the user.