Running the calibration procedure

Following the baseline procedure, you can perform a calibration. A calibration yields a mapping function for mapping the measured eye-vector to the estimated point-of-gaze. More correctly, it yields a set of possible gaze mapping functions.

Assuming you have informed and instructed the participant, you can click the Calibrate button or press c or C to start.

On the test screen, targets will be presented one after another as defined in the settings.

On succesful completion of the calibration, two info signs will appear below the Calibrate button. Hovering the mouse cursor over these signs will show the calibration results.

Hovering the mouse cursor over the first info sign will display the retrospective mapping errors. Generally you need not pay much attention to these numbers.

Hovering the mouse cursor over the second info sign displays the measured calibration points graphically (see example output). The displayed points should (roughly) match the presented calibration pattern. If some points seem a bit out of place that’s acceptable. Some shearing, stretching and rotation is also acceptable. If however there are one or more points that are clearly invalid then you should drop the current calibration and start over.

See Calibrate in the Eyevec-control user manual for example output.