–
For projected displays, measure the size of the visible projection on the display (see the following image).
–
In a setup where the stimuli are filmed by a scene camera, the active display area must be calculated based on
the calibration grid size. The calibration grid must have the same shape as the calibration pattern used in Tobii
Studio and include either five or nine points. The calibration points can be drawn on a paper, marked on a cali-
bration board, or marked on objects in the scene. Make sure that the corners of the calibration grid are exactly
90 degrees and that the center point is exactly in the middle of the grid. It is also good to include the 25% larger
Active Display Area around the grid to make it easier to measure the parameters required in the X Configuration
Tool.
How to calculate the 25% larger Active Display Area for the setups that use an external calibration grid is de-
scribed below:
–
Active Display Area Height = 1.25 × Calibration grid height.
–
Active Display Area Width = 1.25 × Calibration grid width.
•
A
A
—
eye tracker angle. Calibrate the digital angle gauge supplied with the Tobii X2 Eye Tracker desk stand package
before measuring the angle between the eye tracker and the vertical plane. To calibrate the digital angle meter, place
it on a flat, vertical surface and press the
“
Zero
”
button. To measure the angle, place the digital angle gauge on the
front surface of the eye tracker. In many setups the angle is commonly around 25 degrees.
Tobii X2-60 Eye TrackerUser
’
s manual v.1.0.3 - en-US
4 Setting Up the Tobii X2
–
60 Eye Tracker
17
