Tobii X2-30 Eye Tracker Compact Edition Specifiche tecniche

Product Description

Tobii X2-30 Eye Tracker Compact Edition

Tobii X2-30 Eye Tracker Wide Edition

Tobii X2-60 Eye Tracker Compact Edition

Tobii X2-60 Eye Tracker Wide Edition

Product Description

Manual Version 1.0

01/2013

The information contained in this document is proprietary to

Tobii Technology. Any reproduction in part or whole without

prior written authorization by Tobii Technology is prohibited.

Products that are referred to in this document may be either

trademarks and/or registered trademarks of the respective

owners. The publisher and the author make no claim to these

trademarks.

While every precaution has been taken in the preparation of

this document, the publisher and the author assume no

responsibility for errors or omissions, or for damages resulting

from the use of information contained in this document or

from the use of programs and source code that may

accompany it. In no event shall the publisher and the author

be liable for any loss of profit or any other commercial

damage caused or alleged to have been caused directly or

indirectly by this document.

Content subject to change without notice.

Please check Tobii web site www.tobii.com for updated

versions of this manual.

Table of Contents

11 IInnttrroodduuccttiioonn .................................................................................................................................................................................................................................................................... 11

1.1 Overview...............................................................................................................................1

1.2 ApplicationsAreas..................................................................................................................2

1.3 asic Operating Principles ......................................................................................................2

22 TTeecchhnniiccaall SSppeecciiffiiccaattiioonnss .......................................................................................................................................................................................................................... 33

2.1 Tobii X2–30 Eye Trackers ........................................................................................................3

2.2 Tobii X2–60 Eye Trackers ........................................................................................................5

33 DDaattaa SSaammppllee OOuuttppuutt ........................................................................................................................................................................................................................................ 88

44 EEyyee TTrraacckkiinngg SSeettuuppss........................................................................................................................................................................................................................................ 99

4.1 Typical Tobii X2 Eye Tracker Screen Setups ..............................................................................9

4.1.1 Local Live Viewer ....................................................................................................9

4.2 Typical Tobii X2 Eye Tracker Physical Object Setup ..................................................................10

4.2.1 External video stimulus recording.............................................................................10

AAppppeennddiixx AA::GGlloossssaarryy..................................................................................................................................................................................................................................................1111

AAppppeennddiixx ::AAccccuurraaccyy aanndd PPrreecciissiioonn MMeeaassuurreemmeennttss..............................................................................................................................................1122

:1 Gaze Precision.....................................................................................................................12

:2 Gaze Accuracy ....................................................................................................................12

AAppppeennddiixx CC::CCoommpplliiaannccee IInnffoorrmmaattiioonn aanndd WWaarrnniinnggss..............................................................................................................................................1133

C:1 FCC Statement....................................................................................................................13

C:2 Industry Canada Statement....................................................................................................13

C:3 Standards ...........................................................................................................................13

C:4 Mounting Warning................................................................................................................13

C:5 Infrared Warning ..................................................................................................................14

1 Introduction

1.1 Overview

This document describes the features and functionality of the Tobii X2 Eye Trackers. The X2 Eye Tracker is a stand alone eye

tracker that can be used in various setups by attaching it to monitors, laptops or for performing eye tracking on physical objects.

The eye tracker requires some assembly before first time use and after transport.

The Tobii X2 Eye Tracker is an unobtrusive eye tracker for detailed research of natural behavior. Its large head movement box al-

lows the subject to move during recording while maintaining accuracy and precision. The Tobii X2 Eye Trackers offer maximum

flexibility with numerous software and stimuli set-up options.

The X2-30 and X2–60 Eye Trackers come in a Compact and in a Wide Edition, to meet you’re your specific needs:

•The CCoommppaacctt EEddiittiioonn is a smaller version of the eye tracker, measuring 184 mm (7.2’’) in length. It enables your portable

eye tracking lab or studies that require a small eye tracker to track:

–Laptops and smaller PC monitors up to app. 22’’ (up to 31° gaze angle)

–Mobile devices

–Small real-world interfaces

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn mmoouunntteedd oonn aa llaappttoopp ((llaappttoopp nnoott iinncclluuddeedd))::

•The WWiiddee EEddiittiioonn, measuring 400 mm (15.7ʺ) in length, is designed for studies that require larger gaze angels (up to

37°). It enables studies that involve larger stimuli, being able to track interfaces such as:

–PC monitors up to app. 27’’

–TV screens

–Projections, simulators

–Large real-world interfaces

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn mmoouunntteedd oonn aa mmoonniittoorr ((mmoonniittoorr nnoott iinncclluuddeedd))::

Product Description v.1.0 - en-US 1 Introduction 1

1.2 Applications Areas

The modular system can be used both in screen and real-world test scenarios, making way for a very broad spectrum of studies.

You can mount the eye tracker on a laptop, a PC monitor, an all-in-one PC, or even a tablet. Present your stimuli using a projec-

tion or TV. You can study real-world interfaces like a control panel, an ATM or a store shelf. The supplied mounting solutions sup-

port a variety of study designs.

•TToobbiiii XX22––3300 EEyyee TTrraacckkeerrss —The X2-30 Eye Trackers are designed for studies primarily aimed at determining precisely

where the participants are looking —the gaze point—rather than studying timing, duration of fixations or eye movements

such as saccades, for example.

•TToobbiiii XX22––6600 EEyyee TTrraacckkeerrss —The X2-60 eye tracker is designed for studies aimed at determining precisely where the

participants are looking and for studying and measuring eye fixations and other eye tracking metrics based on these.

1.3 Basic Operating Principles

During tracking, Tobii Eye Trackers use infrared diodes to generate reflection patterns on the corneas of the subject’s eyes.

These reflection patterns, together with other visual data about the subject, are collected by image sensors. Sophisticated image

processing algorithms identify relevant features, including the eyes and the corneal reflection patterns. Complex mathematics is

used to calculate the 3D position of each eyeball, and finally the gaze point on the screen; in other words, where the subject is

looking.

Tobii Eye Trackers are designed for use in indoor office environments.

21 Introduction Product Description v.1.0 - en-US

2 Technical Specifications

The characteristics of an eye tracker can be described in terms of gaze accuracy and gaze precision. Accuracy describes the an-

gular average distance from the actual gaze point to the one measured by the eye tracker. Gaze precision describes the spatial

variation between successive samples collected when the subject fixates at a specific point on a stimuli. More information re-

garding the accuracy and precision measurements can be found in

Appendix : Accuracy and Precision Measurements

. A glos-

sary can be found at

Appendix A: Glossary

2.1 Tobii X2–3 Eye Trackers

Table 2.1 Gaze Accuracy (Preliminary)

GGaazzee aaccccuurraaccyy1

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn

((ffiirrmmwwaarree vveerrssiioonn 00..77..33))

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn

((ffiirrmmwwaarree vveerrssiioonn —— ppeennddiinngg))

iinnooccuullaarr MMoonnooccuullaarr iinnooccuullaarr MMoonnooccuullaarr

At ideal conditions 0.4 0.5 0.4 0.5

At 25° gaze angle 0.5 0.6 0.5 0.6

At 30° gaze angle 0.5 0.6 0.5 0.6

At 35° gaze angle N/A N/A Pending Pending

At 1 lux Pending Pending Pending Pending

At 300 lux 0.4 0.5 0.4 0.5

At 600 lux Pending Pending Pending Pending

At 1000 lux Pending Pending Pending Pending

White stimuli background Pending Pending Pending Pending

1. Accuracy under ideal conditions is measured in the centre of the head movement box with the subject fixed in a chinrest. Data is collected immediately after calibration, in a controlled laboratory

environment with constant illumination, with 9 stimuli points at gaze angles of ≤18º.

AAccccuurraaccyy aatt iiddeeaall ccoonnddiittiioonnss —— XX22––3300 CCoommppaacctt EEddiittiioonn ((PPrreelliimmiinnaarryy))

AAccccuurraaccyy aatt vvaarryyiinngg ddiissttaanncceess —— XX22––3300 CCoommppaacctt EEddiittiioonn ((PPrreelliimmiinnaarryy))

Product Description v.1.0 - en-US 2 Technical Specifications 3

Table 2.2 Gaze Precision (Preliminary)

GGaazzee pprreecciissiioonn

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoomm--

ppaacctt EEddiittiioonn

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee

EEddiittiioonn

iinnooccuullaarr MMoonnooccuullaarr iinnooccuullaarr MMoonnooccuullaarr

Artificial Eye With Stampe filter 21Pending Pending Pending Pending

Without filter Pending Pending Pending Pending

Human Eye With Stampe filter 2 Pending Pending Pending Pending

Without filter 0.32 0.43 0.32 0.43

1. Stampe ( ehavior Research Methods, Instruments & Computers, 1993, 25 (2), pp.137-142) describes a noise reduction filter commonly used for eye tracking data. In these measurements, the

Stampe stage 2 algorithm has been applied.

Table 2.3 Eye Tracking Specifications (Preliminary)

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoomm--

ppaacctt EEddiittiioonn

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee

EEddiittiioonn

SSaammpplliinngg rraattee130 Hz

(std. deviation ~ 3Hz)

30 Hz

(std. deviation ~ 3Hz)

TToottaall ssyysstteemm llaatteennccyy 48–67 ms 48-67 ms

TTiimmee ttoo ttrraacckkiinngg rreeccoovveerryy For blinks: immediate For blinks: immediate

HHeeaadd mmoovveemmeenntt2Freedom of head

movement at 70 cm

(width x height)

50 x 36 cm (20 x 14ʺ) 50 x 36 cm (20 x 14ʺ)

Operating distance

(eye tracker to subject) 40–90 cm (15.7–33.5ʺ) 50–100 cm (20–39ʺ)

RReeccoommmmeennddeedd ssccrreeeenn ssiizzee up to 22ʺup to 27ʺ

DDaattaa ssaammppllee oouuttppuutt Timestamp, eye position, gaze point,

pupil diameter, validity code

Timestamp, eye position, gaze point,

pupil diameter, validity code

1. As the Tobii X2-30 Eye Trackers have a variable and low sampling rate, they are not suitable for detailed studies of the onset or durations of fixations, saccades or other measures requiring high

temporal and stable sampling precision.

2. Freedom of head movement describes the volume in front of the tracker in which the user must have at least one of the eyes. The numbers are specified parallel/orthogonal to screen surface, as-

suming eye tracker is at 20 degree angle to screen.

Table 2. Eye Tracking Units (Preliminary)

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoommppaacctt

EEddiittiioonn

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn

EEyyee ttrraacckkeerr pprroocceessssiinngg uunniitt Embedded, no external eye tracking host

necessary

Embedded, no external eye tracking host

necessary

CCoonnnneeccttoorrss US 2.0 US 2.0

WWeeiigghhtt 200 g (7.1 oz) 250 g (8.8 oz)

SSiizzee 184*28*23 mm (7.2 * 1.1* 0.9’’) 400*28*23 mm (15.7 * 1.1* 0.9’’)

MMoouunnttiinngg ssoolluuttiioonnss Adhesive Mounting brackets for monitors,

laptops and tablets. Desk Stand Acces-

sory package for Tripod and desks

Adhesive Mounting brackets for moni-

tors, laptops and tablets. Desk Stand Ac-

cessory package for Tripod and desks

42 Technical Specifications Product Description v.1.0 - en-US

Table 2.5 Hardware package content (Preliminary)

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn HHaarrddwwaarree

PPaacckkaaggee

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn HHaarrddwwaarree

PPaacckkaaggee

Tobii X2-30 Eye Tracker Compact Edition Tobii X2-30 Eye Tracker Wide Edition

3 x Adhesive mounting bracket kit (each kit contains 3 brack-

ets for different screen depths) for permanent installation.

6 x Adhesive mounting bracket kit (each kit contains 3 brack-

ets for different screen depths) for permanent installation.

Safety Instructions Safety Instructions

Installation Guide Installation Guide

Mounting tape kit Mounting tape kit

US extension cable N/A

Zipper bag Zipper bag

Tobii X2-30 Eye Tracker US memory stick containing the

Tobii Eye Tracker Installer.

Tobii X2-30 Eye Tracker US memory stick containing the

Tobii Eye Tracker Installer.

Tobii X2-30 Eye Tracker user manual Tobii X2-30 Eye Tracker user manual

N/A X2 Wide Edition mounting aid

Table 2.6 Accessories (Preliminary)

TToobbiiii XX22--3300 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn TToobbiiii XX22--3300 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn

Tobii X2 Eye Tracker laptop case Tobii X2 Eye Tracker laptop case

Tobii X2 Eye Tracker desk stand package:

•Tobii X2 Eye Tracker desk stand kit

•Digital angle gauge

•Measuring tape

Tobii X2 Eye Tracker desk stand package:

•Tobii X2 Eye Tracker desk stand kit

•Digital angle gauge

•Measuring tape

2.2 Tobii X2–6 Eye Trackers

Table 2.1 Gaze Accuracy (Preliminary)

GGaazzee aaccccuurraaccyy1

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn

((ffiirrmmwwaarree vveerrssiioonn —— ppeennddiinngg))

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn

((ffiirrmmwwaarree vveerrssiioonn —— ppeennddiinngg))

iinnooccuullaarr MMoonnooccuullaarr iinnooccuullaarr MMoonnooccuullaarr

At ideal conditions 0.4 0.5 0.4 0.5

At 25° gaze angle 0.5 0.6 0.5 0.6

At 30° gaze angle 0.5 0.6 0.5 0.6

At 35° gaze angle N/A N/A Pending Pending

At 1 lux Pending Pending Pending Pending

At 300 lux 0.4 0.5 0.4 0.5

At 600 lux Pending Pending Pending Pending

At 1000 lux Pending Pending Pending Pending

White stimuli background Pending Pending Pending Pending

1. Accuracy under ideal conditions is measured in the centre of the head movement box with the subject fixed in a chinrest. Data is collected immediately after calibration, in a controlled laboratory

environment with constant illumination, with 9 stimuli points at gaze angles of ≤18º.

Product Description v.1.0 - en-US 2 Technical Specifications 5

Table 2.2 Gaze Precision (Preliminary)

GGaazzee pprreecciissiioonn

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr CCoomm--

ppaacctt EEddiittiioonn

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr WWiiddee

EEddiittiioonn

iinnooccuullaarr MMoonnooccuullaarr iinnooccuullaarr MMoonnooccuullaarr

Artificial Eye With Stampe filter 21Pending Pending Pending Pending

Without filter Pending Pending Pending Pending

Human Eye With Stampe filter 2 Pending Pending Pending Pending

Without filter 0.32 0.43 0.32 0.43

1. Stampe ( ehavior Research Methods, Instruments & Computers, 1993, 25 (2), pp.137-142) describes a noise reduction filter commonly used for eye tracking data. In these measurements, the

Stampe stage 2 algorithm has been applied.

Table 2.3 Eye Tracking Specifications (Preliminary)

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr CCoomm--

ppaacctt EEddiittiioonn

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr WWiiddee

EEddiittiioonn

SSaammpplliinngg rraattee 60 Hz

(std. deviation approx. 0.1Hz)

60 Hz

(std. deviation approx. 0.1Hz)

TToottaall ssyysstteemm llaatteennccyy 48–67 ms 48-67 ms

TTiimmee ttoo ttrraacckkiinngg rreeccoovveerryy For blinks: immediate For blinks: immediate

HHeeaadd mmoovveemmeenntt1Freedom of head move-

ment at 70 cm (width x

height)

50 x 36 cm (20 x 14ʺ) 50 x 36 cm (20 x 14ʺ)

Operating distance

(eye tracker to subject) 45–90 cm (15.7–33.5ʺ) 50–100 cm (20–39ʺ)

RReeccoommmmeennddeedd ssccrreeeenn ssiizzee up to 22ʺup to 27ʺ

DDaattaa ssaammppllee oouuttppuutt Timestamp, eye position, gaze point,

pupil diameter, validity code

Timestamp, eye position, gaze point,

pupil diameter, validity code

1. Freedom of head movement describes the volume in front of the tracker in which the user must have at least one of the eyes. The numbers are specified parallel/orthogonal to screen surface, as-

suming eye tracker is at 20 degree angle to screen.

Table 2. Eye Tracking Units (Preliminary)

TToobbiiii XX22--6600 EEyyee TTrraacckkeerr CCoommppaacctt EEddiittiioonn TToobbiiii XX22--6600 EEyyee TTrraacckkeerr WWiiddee EEddiittiioonn

EEyyee ttrraacckkeerr pprroocceessssiinngg

uunniitt

Tobii X2-60 Eye Tracker external processing

unit

Tobii X2-60 Eye Tracker external processing

unit

CCoonnnneeccttoorrss US 2.0 US 2.0

WWeeiigghhtt 200 g (7.1 oz) 250 g (8.8 oz)

SSiizzee 184 x 28 x 23 mm (7.2 x 1.1 x 0.9ʺ) 400 x 28 x 23 mm (15.7 x 1.1 x 0.9ʺ)

MMoouunnttiinngg ssoolluuttiioonnss Adhesive Mounting brackets for monitors, lap-

tops and tablets. Desk Stand Accessory pack-

age for Tripod and desks

Adhesive Mounting brackets for monitors,

laptops and tablets. Desk Stand Accessory

package for Tripod and desks

Table 2.5 Tobii X2-60 Eye Tracker external processing unit

CCoonnnneeccttoorrss US 2.0, LAN and power connector

SSiizzee 116.6 x 112 x 39 mm (4.6 x 4.4 x 1.55’’)

WWeeiigghhtt 500 g (17.6 oz)

62 Technical Specifications Product Description v.1.0 - en-US

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