Input methods and systems for eye positioning using plural glints

A non-transitory computer readable medium having stored therein instructions that are executable to cause a computing device to perform functions comprising:

• causing an imaging device that is associated with a head-mountable display (HMD) to capture image data that includes an eye;
• while the image data of the eye is being recorded, causing a plurality of light sources that are attached to the HMD and generally directed towards the eye to switch on and off according to a predetermined pattern, wherein the predetermined pattern is such that at least two of the light sources are switched on at any given time while the image data of the eye is being recorded;
• analyzing the image data of the eye to detect controlled glints that correspond to the plurality of light sources;
• and
• determining a measure of eye position based on the controlled glints.

A computing system comprising:

• a non-transitory computer readable medium;
• program instructions stored on the non-transitory computer readable medium and executable by at least one processor to:
• cause an imaging device that is associated with a head-mountable display (HMD) to capture image data that includes an eye;
• while the image data of the eye is being recorded, cause a plurality of light sources that are attached to the HMD and generally directed towards the eye to switch on and off according to a predetermined pattern, wherein the predetermined pattern is such that at least two of the light sources are switched on at any given time while the image data of the eye is being recorded;
• analyze the image data of the eye to detect controlled glints that correspond to the plurality of light sources;
• and
• determine a measure of eye position based on the controlled glints.

A computer-implemented method comprising:

• receiving, by a computing device, image data of an eye, wherein the image data corresponds to a head-mountable display (HMD), wherein a plurality of light sources that are attached to the HMD and generally directed towards the eye are switched on and off according to a predetermined pattern while the image data is being recorded, and wherein the predetermined pattern is such that at least two of the light sources are switched on at any given time while the image data is being recorded;
• analyzing, b the computing device, the image data of the eye to detect controlled glints that correspond to the plurality of light sources;
• and
• determining, by the computing device, a measure of eye position based on the controlled glints.