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Adjusting image frames based on tracking motion of eyes

  • US 10,338,677 B2
  • Filed: 10/28/2015
  • Issued: 07/02/2019
  • Est. Priority Date: 10/28/2015
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a light emitter to emit light toward an eye of a subject, the eye having a retina and a cornea;

    a camera to capture images of the cornea of the eye having glints produced by reflection of the light from the cornea;

    a display device operated by a display module to sequentially display image frames; and

    a processor to;

    determine, based at least in part on a first captured image of the cornea, first locations of the glints at a first time, while the display device is displaying an image frame, and a first gaze direction, and generate a first virtual cornea sphere based on the first locations, with the first virtual cornea sphere having a first center;

    determine, based at least in part on a second captured image of the cornea, second locations of the glints at a second time, while the display device is displaying the image frame, and a second gaze direction, and generate a second virtual cornea sphere based on the second locations, with the second virtual cornea sphere having a second center;

    generate a virtual sphere having a center, using the first and second centers;

    determine a retinal velocity of the eye corresponding to differences between the first gaze direction and the second gaze direction, the determined retinal velocity being velocity of the image frame projected onto the retina, measured in a retinal coordinate frame using the center of the virtual sphere; and

    provide signals to the display module to change a display time for the image frame based, at least in part, on the retinal velocity.

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