10 thoughts on “Eye tracking via electrical impulse

  1. interesting. RObert Zemeckis (back to the future) used this to record the actors eye movements in Beowulf for accurate translation to the digital models.

  2. I don’t know if it’s still the method of choice, but in the early days of sleep research (late 60’s, early 70’s) this same principle was used to detect REM sleep. The basic idea is that because the eye is an electrochemical device with all the “wires” (nerves) running out the back, the eye has an electrical potential. Here’s an article on Wikipedia: http://en.wikipedia.org/wiki/electro_oculography

  3. @Kevin H

    Thank you for the wonderful article. I found it much more informative then the one actually featured. :) I only wish he took it further. I would have loved to see him continue to develop this into a working control system. Anyway, cool link. Thanks.

  4. i wonder when we’ll get a DIY device which points your eyes in a certain direction :O

    ps: no, pr0n does not count :-/

  5. I’ve done something similar. It’s easy and cheap although you can have some precision problems caused by the electrodes contact. Yo must clean your skin well and/or make something to hold the electrodes in place.

  6. The problem with EOG interfaces is that the position is basically a small DC signal, which tends to saturate any amps. If you highpass at .1Hz or so, you can get some decent tracking, but it’s only accurate to a few degrees, which can translate to a significant distance on a monitor. Plus, if you filter DC out, then you can only tell when you move, since your signal will go in one direction, and then level out back to zero. You’d use that waveform’s magnitude to figure out how far your eye moved.

    There’s a reason we don’t see EOG equipment around very much. Still cool stuff though.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s