What is Device Calibration and When should I Device Calibrate?

What does a device calibration do?

AdHawk's eye tracking system requires an accurate estimation of the angular position of the scanning beam in order to function correctly. The scanner module generates a 2D scan pattern onto the user’s eye which can be scaled and offset in order to project the optimal pattern onto a user's eyes. As with all sensors, there are numerous disturbances that may compromise the accuracy and precision of the system. The device calibration is required to “zero out” these sources of error to ensure optimal system performance.

When should I preform a device calibration?

A device calibration is recommended to be preformed at least once per week. If you use your AdHawk MindLink for long periods of time, then it is recommended to perform a device calibration at the start of each day of use. 

When troubleshooting potential reasons for poor eye tracking performance, a device calibration can often help. The two eye sensors may experience calibration related errors at different rates, so if you are getting results such as "right eye not detected", and you are confident you have selected the right nosepiece, the solution is often a device calibration. 

How to Perform a device calibration. 

For best eye tracking results, the MindLink glasses should be calibrated using the calibration fixture at the start of each day of use. At a minimum the glasses should have the device calibrated once per week.  Place the glasses in the calibration fixture (as shown below) and close the lid so that it snaps securely.  Open the AdHawk Hub software on the computer and click Tools>Device Calibration to begin the process.