Transcript Diapositive 1

Posture considerations
writing with head mounted
eye tracker
10-12 April 2012, Mshs, University of Poitiers, France
Eye trackers primarily designed to read on screen
have geometric requirements.
Participant line of sight should be perpendicular to the screen
surface (more or less).
10-12 April 2012, Mshs, University of Poitiers, France
Nowadays, handwriting is usually done on a flat surface,
not a vertical one.
Handwriting support can be “tilted”.
But when seated, problems with line of sight tends
to appear.
Except in this case !
(Beware to backache)
10-12 April 2012, Mshs, University of Poitiers, France
When seated:
• from the eye tracker head camera (and participant) point of view, screen is
not a square, but a trapeze
•
participant are closer to “screen” than recommended by manufacturer:
because of forearm length, participant’s eye is about 35 cm from screen.
•
participant moving up / down or tilting head creates parallax effect:
gaze point is miscalculated.
10-12 April 2012, Mshs, University of Poitiers, France
A solution
electrically
adjustable
height
Participant stands up, desk is elevated toward his elbow.
10-12 April 2012, Mshs, University of Poitiers, France