Eye tracking: How to find reference coordinates?
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I'm working on Eye tracking. So far have detected the circular part. I want to know how can i calculate the coordinates of an eye ball? what is the command? And what reference point should be taken.
Please note that finding the center of the eye is not important for me. I just want to detect movement. For example.
At time A: Eye ball is looking straight.
At time B: Eye ball is looking upward.
Thankyou.
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Answers (1)
Image Analyst
on 1 Jun 2013
I would think that you just have some coordinates from your system depending on where the subject is looking - they might be arbitrary digital numbers coming out of your tracking system, say values in the range of 0-65535 or whatever. And the reference point would be defined by your scene. For example if the subject is looking at a video monitor you might define (0,0) as the upper left corner of the monitor and define the other corners based on centimeters, or pixels, or whatever you want. Then you calibrate by having your subject look at those corner locations and basically derive a transformation that maps your eye tracker coordinates into real world coordinates on the monitor.
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