Tobii X2-30 Eye Tracker Compact Edition Product Description page 12

3 Data Sample Output
Different applications can be connected as clients to the eye tracker to, e.g., gather eye gaze data in real-time and perform cali-
brations. Applications that can be used together with the eye tracker include the Tobii Studio™ analysis software, third party anal-
ysis products such as E-Prime® or your own custom written software for analysis, gaze-contingent applications or eye control
applications. For more information on how to create your own applications, please refer to the Tobii Software Development Kit
(SDK) product description, version 3.0 or later.
Below is a list of data that can be accessed through the output of the eye tracker. In Tobii Studio™ analysis software this data
can be accessed through a Data export function, and easily imported into a spreadsheet for further analysis. Please note that
some of the parameter names differs between what is delivered from the SDK and what is available in the Tobii Studio™ data
export.
T T i i m m e e s s t t a a m m p p Timestamp in milliseconds stating the mid-exposure time when the sample was collected by the eye
tracker's image sensors.
Horizontal screen position of the gaze point for the left eye.
G G a a z z e e P P o o i i n n t t X X L L e e f f t t
G G a a z z e e P P o o i i n n t t Y Y L L e e f f t t Vertical screen position of the gaze point for the left eye.
C C a a m m X X L L e e f f t t
Horizontal location of the left pupil in the camera image (0 is left edge, 1 is right edge).
C C a a m m Y Y L L e e f f t t
Vertical location of the left pupil in the camera image (0 is top, 1 is bottom).
D D i i s s t t a a n n c c e e L L e e f f t t Distance from the eye tracker to the left eye. The distance is given in mm on a straight axis right out
from the eye tracker plane.
P P u u p p i i l l L L e e f f t t
Size of the pupil (left eye) in mm. The distance and pupil size measurements are calculated to be as
close to real values as possible. However, individual differences in the eyes of subjects or the
strength of glasses/contact lenses will affect the size values. Shifts between the use of eye tracking
technique during a recording will also affect the pupil size value.
V V a a l l i i d d i i t t y y L L e e f f t t The validity code indicates the system's confidence in whether it has correctly identified which eye
is left and right for the specific sample. The validity is 0 if the eye is found and the tracking quality
good. If the eye cannot be found by the eye tracker the validity code will be 4. The value is for the left
eye.
The horizontal screen position of the gaze point for the right eye.
G G a a z z e e P P o o i i n n t t X X R R i i g g h h t t
G G a a z z e e P P o o i i n n t t Y Y R R i i g g h h t t Vertical screen position of the gaze point for the right eye .
C C a a m m X X R R i i g g h h t t
Horizontal location of the right pupil in the camera image (0 is left edge, 1 is right edge).
C C a a m m Y Y R R i i g g h h t t
Vertical location of the right pupil in the camera image (0 is top, 1 is bottom).
D D i i s s t t a a n n c c e e R R i i g g h h t t Distance from the eye tracker to the right eye. The distance is given in mm on a straight axis out from
the eye tracker plane.
P P u u p p i i l l R R i i g g h h t t
Size of the pupil (right eye) in mm. The distance and pupil size measures are calculated to be as
close to real values as possible. However, individual differences in the eyes of subjects or the
strength of glasses/contact lenses will affect these values. Shifts between the use of eye tracking
technique during a recording will also affect the pupil size value.
V V a a l l i i d d i i t t y y R R i i g g h h t t The validity code indicates the system's confidence in whether it has correctly identified which eye
is left and right for the specific sample. The validity is 0 if the eye is found and tracking quality is
good. If the eye cannot be found by the eye tracker, the validity code will be 4. The value is for the
right eye.
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3 Data Sample Output Product Description v.1.0 - en-US