Patent ID: 9202280
Filing Date: 2015-12-01
Classification: A61B,G01S,G02B,G03B,G06F,G06K,G06T,G09G,H04N

Abstract:
1. A computer-implemented method comprising: operating an imaging device to capture infrared (IR) image data of an eye; while the IR image data is being captured, controlling, by a computing system, three or more infrared (IR) light sources to switch the IR light sources on and off according to a predetermined pattern, wherein the IR light sources are arranged on a head-mountable device (HMD) to project IR radiation such that the IR radiation reflects off the eye when the HMD is worn, and wherein the predetermined pattern is such that one of the IR light sources is switched off and the remaining IR light sources are switched on during the recording of each of a plurality of frames of the IR image data; subtracting, by the computing system, a first frame of the IR image data from a second frame of the IR image data to determine a first frame difference; analyzing the first frame difference to determine at least one location for a first glint corresponding to a first one of the IR light sources, wherein the first IR light source is switched off during the first frame and is switched on during the second frame; determining eye data based at least in part on the determined location of the first glint; and using the determined eye data as a basis for operating at least one component of the HMD.