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1. Tobii X2 60 Eye Tracker Compact Edition firmware version Gaze accuracy 1 0 5 Binocular Monocular At ideal conditions 0 4 0 4 At 25 gaze angle 0 4 0 5 At 30 gaze angle 0 4 0 5 At 1 lux 1 2 1 9 At 300 lux 0 4 0 4 At 600 lux 0 4 0 6 At 1000 lux 0 6 0 9 White stimuli background 1 2 1 9 ds Accuracy under ideal conditions is measured in the center of the head movement box with the participant fixed in a chinrest Data is collected immediately after calibration in a controlled labora tory environment with constant illumination with 9 stimuli points at gaze angles of lt 20 Accuracy at ideal conditions X2 60 Compact Edition wn z 10 S o 8 v 5 6 Qa S5 4 FEE UJ 3 6 uu B o y WV 0 HD ON WH YF amp o Q Q Q Q Q Q Ny vy vy NN y Accuracy Product Description v 1 0 1 en US 2 Technical Specifications 5 Accuracy at varying distances X2 60 Compact Edition Accuracy COCr EPP Boooouxmnrovoo oot ON TIL 40cm 45cm 50cm 55cm 60cm 65cm 70cm 75cm 80cm 85cm 90cm Table 2 8 Gaze Precision Gaze precision at ideal conditions Distance from eye tracker Tobii X2 60 Eye Tracker Compact Edition Binocular Monocular Artificial Eye NA NA Human Eye 0 34 0 45 Table 2 9 Eye Tracking Specifications Eye Tracking Specifications Tobii X2 60 Eye Tracker Compact Edition Sampling rate 60 Hz std dev approx2. 3 2 1 Tobii X2 30 Eye Tracker Specifications cessisse enne eene 3 2 2 Tobii X2 60 Eye Tracker Specifications eee eee 5 3 Data ale Aa 8 285 21 7 071 PA AAA aaa 9 4 1 Typical Tobii X2 Eye Tracker Screen Setups sssssssssee eene nnne 9 4 1 1 Local Live VIWE E 9 4 2 Typical Tobii X2 Eye Tracker Physical Object Setup sss 10 4 2 1 External video stimulus recording wsswwaanwananwananannunanzunanuananaaanaakunakunakunazanaaawa 10 Append A Glossa Loo D eio ish ied nde iE HQ a e Ea eins 11 Appendix B Accuracy and Precision Measurements eee mzazi mamia eerte 12 B1 Gaze PRECISION mE EE 12 B2 Cru mMsrcu enanas 12 Appendix C Compliance Information and Warnings eeeseeeeeeceeeeee eren neret 13 C1 FCC Statome NL ERROR II PEL 13 C2 Industry Canada Statement ertet ecrit ei etcetera e uuo Due P se tk kaaa ee ea Sexe aka Rb Deu Ra Puig 13 C3 LANG ALAS PEE 13 C4 Mo nting BAIT Ae 13 C5 AA Ba aclaro ERREUR 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
3. 0 1 Hz Total system latency 35 ms Time to tracking recovery For blinks immediate Head movement Freedom of head movement at 70 cm width x height 50 x 36 cm 20 x 14 Operating distance eye tracker to participant 45 90 cm 15 7 33 5 Recommended screen size up to 25 16 9 Data sample output Timestamp eye position gaze point pupil diameter validity code suming the eye tracker is at a 20 degree angle to the screen Table 2 10 Eye Tracking Unit 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 Eye Tracking Unit Tobii X2 60 Eye Tracker Compact Edition Eye tracker processing unit Tobii X2 60 Eye Tracker external processing unit Connectors USB 2 0 Weight 200 g 7 1 oz Size 184x 28 x 23 mm 7 2 x 1 1 x 0 9 Mounting solutions Adhesive Mounting brackets for monitors laptops and tablets Desk Stand Accessory package for Tripod and desks 6 2 Technical Specifications Product Description v 1 0 1 en US Table 2 11 Tobii X2 60 Eye Tracker external processing unit Connectors USB 2 0 LAN and power connector Size 116 6x 112x 39 mm 4 6 x 4 4 x 1 55 Weight 500 g 17 6 oz Table 2 12 Hardware package content Tobii X2 60 Eye Tracker Compact Edition Hardware Pac
4. a similar set up with slightly modified components can be used External Video Stimulus Recording Setup Primary Screen Stimulus DVD player computer presentation gaming console ne Video capture Video capture VGA DVI card out USB Secondary Screen Live Viewer optional VGA DVI out Computer with Tobii Studio or other supported software 10 4 Eye Tracking Setups Product Description v 1 0 1 en US AppendixA Glossary Monocular binocular Gaze precision Gaze accuracy Sampling rate Total system latency Time to tracking recovery for blinks Time to tracking recovery after lost tracking Freedom of head movement Operating distance Eye tracking processing unit Product Description v 1 0 1 en US Monocular data shown is based on data from the participant s dominant eye only Binocular data is the average of the two eyes Describes the spatial angular variation between a set of consecutive gaze samples Gaze precision can be measured under various conditions Describes the angular average distance from the actual gaze point to the one measured by the eye tracker Gaze accuracy can be measured under various conditions Number of eye tracking data samples per second The duration from mid point of the eye image exposure to when a sample is available via the API on the client computer This includes half of the image exposure time plus image read out and transfer time
5. processing time and time to transfer the data sample to a client computer When a participant blinks the eye tracker loses the ability to track eye gaze because the eye is covered by the eyelid If the pupil is occluded for only a short period the system will regain tracking immediately when the pupil becomes visible again but only if the participant has maintained approximately the same head position during the blink Data during blinks are only lost when the pupil is occluded i e during the eyelid movement itself or when the eye is closed An eye tracker working in a natural user environment may occasionally lose track of the participant s eyes e g when the participant completely turns away from the tracker If a period of a few hundred milliseconds elapses during which the eye tracker is unable to detect the eyes in close proximity to where they were last detected the eye tracker will start searching for the eyes within the entire head movement box The stated measurement is the typical time to tracking recovery in such a situation If the eye tracker is unable to detect the eyes of the participant even after about one minute the system will enter a slow search mode leading to larger recovery times Describes an area width x height in cm where at least one eye is within the eye tracker s field of view Describes the range of distances minimum and maximum between the participant s eyes and the surface covering the eye tracker sens
6. Between July August 9am 5pm US Eastern Standard Time GMT 6 Japan Standard Time GMT 9 Central European Time GMT 1 Tobii Illustrations and specifications do not necessarily apply to products and services offered in each local market Technical specifications are subject to change without prior notice All other trademarks are the property of their respective owners Tobii Headquarters EMEA CENTRAL EUROPE CHINA JAPAN NORTH AMERICA Tobii Technology AB Tobii Technology GmbH Tobii China Sales Office Tobii Technology Japan Ltd Tobii Technology Inc Karlsrovagen 2D Niedenau 45 Room E2 29 F 3 4 13 Takanawa Minato ku 510 N Washington Street Suite 200 S 182 53 Danderyd D 60325 Frankfurt am Main Shanghai Industrial Investment Building Tokyo 108 0074 Fall Church VA 22046 Sweden Germany No 18 Caoxi North Road Japan USA Shanghai China Toll Free 1 888 898 6244 Phone 46 8 663 69 90 Phone 44969 24 75 03 40 Mobile 86 180 1558 6966 Phone 81 3 5793 3316 Phone 1 703 738 1300 Fax 46 8 30 14 00 Fax 49 69 24 75 03 429 Fax 81 3 5793 3317 Fax 1 703 738 1313 www tobii com www tobii com www tobii com www tobii com www tobii com sales tobii com sales de tobii com sales cn tobii com sales jp tobii com sales us tobii com
7. Measurements are done on 20 test subjects without lenses glasses or droopy eyelids Accuracy for one subject is calculated as the mean of several data samples for several stimuli points across a screen The accuracy figure presented is the mean accuracy from all subjects Good accuracy is difficult to achieve at large gaze angles but is important when testing large stimuli For instance the upper corner of a 23 screen with the test subject at a distance of 65 cm 26 from the eye tracker corresponds to a 32 visual angle from the center of the eye tracker unit Consequently measurements are also presented for stimuli presentations at large gaze angles When luminance of the stimuli or the illumination in the lab changes the size and shape of the pupil is affected Unless compensated for this may cause a significantly reduced accuracy Testing the influence of surrounding light and stimuli luminance on accuracy is done in a laboratory environment with controlled light conditions Stimuli points are presented on a black background so as not to influence ambient light conditions Testing is also done with ambient light at a level deemed normal office lighting where the background is changed to white with black stimuli points The results from a test in which the background was changed has been referred to as Drift in previous Tobii product description documents As with precision the distance from the eye tracker influences accuracy When testing t
8. 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 B Accuracy and Precision Measurements and in tests reports available on the Tobii web site A glossary can be found at Appendix A Glossary 2 1 Tobii X2 30 Eye Tracker Specifications Table 2 1 Gaze Accuracy Tobii X2 30 Eye Tracker Compact Edition firmware version 1 0 1 Gaze accuracy Binocular Monocular At ideal conditions 0 4 0 5 At 25 gaze angle 0 4 0 5 At 30 gaze angle 0 4 0 5 At 1 lux 1 0 1 3 At 300 lux 0 4 0 5 At 600 lux 0 5 0 7 At 1000 lux 0 6 0 8 White stimuli background 0 7 1 0 1 Accuracy under ideal conditions is measured in the center of the head movement box with the participant fixed in a chinrest Data is collected immediately after calibration in a controlled labora tory environment with constant illumination with 9 stimuli points at gaze angles of lt 20 Accuracy at ideal conditions X2 30 Compact Edition Number of parcticipant O N B o 2 10 8 4 Vi 0 4 SF SC Accuracy at varying distances X2 30 Compact Edition Accuracy Ns m iiim i C a r 0 0 T T 3 T T T
9. Product Description Tobii X2 30 Eye Tracker Compact Edition Tobii X2 60 Eye Tracker Compact Edition tobii Product Description Version 1 0 1 09 2013 All rights reserved Tobii Technology AB 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 document Table of Contents EE 1 1 1 1 Qu E 1 1 2 Applications Areas rU 1 1 3 Basic Operating Principles wwwamaaamwnnaaawana nanu naaanunananza anaanza nnne nennen 2 JR sso Eo I eT
10. T T T T T 31 40cm 45cm 50cm 55cm 60cm 65cm 70cm 75cm 80cm 85cm 90cm Distance from eye tracker Product Description v 1 0 1 en US 2 Technical Specifications 3 Table 2 2 Gaze Precision oT se Tobii X2 30 Eye Tracker Compact Edition Gaze precision at ideal conditions Binocular Monocular Artificial Eye NA NA Human Eye 0 32 0 45 Table 2 3 Eye Tracking Specifications Eye Tracking Specifications Tobii X2 30 Eye Tracker Compact Edition Sampling rate 30 Hz std dev 2Hz Total system latency 50 70 ms Time to tracking recovery For blinks immediate Head movement Freedom of head movement at 70 50x 36 cm 20 x 14 cm width x height Operating distance eye tracker to 40 90 cm 15 7 33 5 participant Recommended screen size up to 25 16 9 Data sample output 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 the eye tracker is at a 20 degree angle to the screen Table 2 4 Eye Tracking Un
11. e Computer with Tobii Studio or other supported software 4 1 1 The setup below is used when the test is to be supervised from a separate screen where the test leader can see the eye move ments of the subject in real time during testing Local Live Viewer Local Live Viewer Setups Projector D VGA DVI out Primary Screen Stimulus Presentation Projected Screen Tobii X2 Eye Tracker gt mounted on a tripod USB Primary Screen Stimulus presentation Secondary Screen Live Viewer optional Secondary Screen Live Viewer optional Product Description v 1 0 1 en US Computer with Tobii Studio or other supported software Computer with Tobii Studio or other supported software 4 Eye Tracking Setups 9 4 2 Typical Tobii X2 Eye Tracker Physical Object Setup When studying a stimuli that doesn t have a screen or when studying an external device such as a mobile phone a physical ob ject setup needs to be used where a video or web camera captures the image of the stimuli To record the participant s reactions the conversation between the test leader and test participant you need to connect an addi tional camera and microphone to the computer running Tobii Studio The setups below do not include the user camera and user sound Physical Object Setup Video Camera Calibration Grid A N Aa Tobii K2 Eye Tracker mounted on a tri
12. harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna e Increase the separation between the equipment and receiver e Connect the equipment into a wall outlet on a circuit different from that to which the receiver is connected e Consult the dealer or experienced radio TV technician for assistance C2 Industry Canada Statement This Class B digital apparatus complies with Canadian ICES 003 Cet appareil num rique de la classe B est conforme la norme NMB 003 du Canada C3 Standards The Tobii X2 Eye Trackers complies with the following standards e EC EN62471 Photobiological Safety of Lamps and Lamp Systems EMC Emission EN 61000 6 3 2001 including EN 55022 1998 A1 A2 Class B FCC part 15 Class B EMC Immunity EN 61000 6 1 2007 FCC part 15 Class B C4 Mounting Warning A The Tobii X2 Eye Trackers should be mounted according to MANUFACTURERinstructions of approved mounts Tobii or its agents are not liable for damage or injuries to a person or its property due to a Tobii X2 Eye Trackers falling from a mounted configuration The mounting of a Tobii X2 Eye Trac
13. he validity code will be 4 The value is for the right eye Product Description v 1 0 1 en US 4 Eye Tracking Setups This chapter describes typical setup configurations that can be used with the Tobii X2 Eye Trackers For specific information about custom configurations or system requirements and recommendation please contact your Tobii sales representative or To bii technical support The System Requirements and Recommendations document can be downloaded at www tobii com Your particular needs might differ from these typical configurations More detailed information is available in the Eye Tracker User Manual provided with the product 4 1 These basic setups are the simplest setups when using on screen stimuli such as images movies or web To record the partici pant s reactions the conversation between the test leader and test participant you need to connect an external user camera and microphone to the computer running Tobii Studio The setups below do not include the user camera and user sound Typical Tobii X2 Eye Tracker Screen Setups Single Screen Setups Primary Screen Primary Screen Primary Screen Stimulus Stimulus Stimulus presentation presentation presentation VGA DVI out Computer with VGA DVI Tobii Studio or out other supported software L d34 USB 7 obii X2 60 LAN Eye Tracker external processing unit lusB Computer with Tobii Studio or other supported softwar
14. his influence calibration is done with the subject in the center of the head movement box i e at a distance of 65 cm and measurements are done thereafter Measurements are performed with the test subject at precise and specific distances relative to the eye tracker measured along the axis of the tracking sensors Data from these measurements is binocular 12 Appendix B Accuracy and Precision Measurements Product Description v 1 0 1 en US Appendix C Compliance Information and Warnings C All Tobii X2 Eye Trackers are CE marked indicating compliance with the essential health and safety requirements set out in European Directives C1 FCC Statement This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation n Modifications not expressly approved by Tobii could void the user s authority to operate the equipment under FCC rules This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause
15. it Eye Tracking Unit Tobii X2 30 Eye Tracker Compact Edition Eye tracker processing unit Embedded no external eye tracking host necessary Connectors USB 2 0 Weight 200 g 7 1 oz Size 184 28 23 mm 7 2 1 1 0 9 Mounting solutions Adhesive Mounting brackets for monitors laptops and tablets Desk Stand Accessory package for Tripod and desks Table 2 5 Hardware package content Tobii X2 30 Eye Tracker Compact Edition Hardware Package Tobii X2 30 Eye Tracker Compact Edition 3 x Adhesive mounting bracket kit each kit contains 3 brackets for different screen depths for permanent installation Safety Instructions Installation Guide Mounting tape kit USB extension cable Zipper bag 4 2 Technical Specifications Product Description v 1 0 1 en US Tobii X2 30 Eye Tracker Compact Edition Hardware Package Tobii X2 30 Eye Tracker USB memory stick containing the Tobii Eye Tracker Installer Tobii X2 30 Eye Tracker user manual pdf Table 2 6 Accessories Tobii X2 30 Eye Tracker Compact Edition Tobii X2 Eye Tracker Laptop Case Tobii Mobile Device Testing Solution for X2 Additional Mounting Brackets Tobii X2 Eye Tracker desk stand package e Tobii X2 Eye Tracker desk stand kit e Digital angle gauge e Measuring tape 2 2 Tobii X2 60 Eye Tracker Specifications Table 2 7 Gaze Accuracy
16. kage Tobii X2 60 Eye Tracker Compact Edition 3 x Adhesive mounting bracket kit each kit contains 3 brackets for different screen depths for permanent installation Safety Instructions Installation Guide Mounting tape kit USB extension cable Zipper bag Tobii X2 60 Eye Tracker USB memory stick containing the Tobii Eye Tracker Installer Tobii X2 60 Eye Tracker user manual pdf Tobii X2 60 Eye Tracker external processing unit Table 2 13 Accessories Tobii X2 60 Eye Tracker Compact Edition Tobii X2 Eye Tracker laptop case Tobii Mobile Device Testing Solution for X2 Additional Mounting Brackets Tobii X2 Eye Tracker desk stand package e Tobii X2 Eye Tracker desk stand kit e Digital angle gauge e Measuring tape Product Description v 1 0 1 en US 2 Technical Specifications 7 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 o
17. kers is done entirely at the user s own risk The double sided tape supplied with the adhesive Magnetic Mounting Plates is designed to permanently attach the bracket to the monitor laptop Attempting to remove the bracket after attaching it using the supplied tape can result in damage both to the monitor laptop and the bracket Do not lick the tape or place any part of the tape or Magnetic Mounting Plate in one s mouth Do not mount the Tobii X2 Eye Trackers on monitors positioned above the head or face of a users unless using a dedicated fixed mounting solution Product Description v 1 0 1 en US Appendix C Compliance Information and Warnings 13 C5 Infrared Warning When activated the Tobii X2 Eye Trackers emits pulsed infrared IR light Certain medical devices are susceptible to disturbance by IR light and or radiation Do not use the Tobii X2 Eye Trackers when in the vicinity of such susceptible medical devices as their accuracy or proper functionality could be inhibited 14 Appendix C Compliance Information and Warnings Product Description v 1 0 1 en US 15 tobii Tobii Support EUROPE GLOBAL NORTH AMERICA JAPAN CHINA Phone SWE 46 8 522 950 10 Phone 1 703 738 1320 Phone 81 3 5793 3316 Phone 86 180 1558 5168 Phone GER 49 69 24 75 03 4 27 support tobii com support us tobii com support jp tobii com support cn tobii com Support hours 8 am 6 pm Support hours 8 am 8 pm Support hours 9 am 5 30 pm
18. n the use of eye tracking technique during a recording will also affect the pupil size value 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 O 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 Vertical screen position of the gaze point for the right eye Horizontal location of the right pupil in the camera image 0 is left edge 1 is right edge Vertical location of the right pupil in the camera image 0 is top 1 is bottom 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 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 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 O if the eye is found and tracking quality is good If the eye cannot be found by the eye tracker t
19. nting solutions sup port a variety of study designs e Tobii X2 30 Eye Tracker is 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 Product Description v 1 0 1 en US 1 Introduction 1 e Tobii 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 2 1 Introduction Product Description v 1 0 1 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
20. ors at which eye tracking can be done while maintaining tracking Gaze data calculations are performed by firmware embedded in the eye tracker or in a separate processing unit Appendix A Glossary 11 Appendix B Accuracy and Precision Measurements Gaze accuracy and precision are typically measured in degrees of visual angle One degree accuracy corresponds to an average error of 12 mm 0 47 on a screen at a distance of 65 cm 27 Data is presented as monocular or binocular Monocular data is based on data from the subject s dominant eye only Binocular data is the average of both eyes B1 Gaze Precision Precision measurements are done using artificial eyes to eliminate artifacts from human eye movements Tobii specifies precision both with and without noise reduction filters All measurements are done at the default sampling rate of the eye tracker and at the optimum distance between the eye tracker and the subject Precision is calculated as root mean square RMS of successive samples As the distance from the eye tracker influences precision measurements are also taken at various distances Data from these measurements is binocular B2 Gaze Accuracy Accuracy under ideal conditions is measured in the center 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 lt 20
21. pod USB J Computer with Tobii Studio or other supported software 4 2 1 External video stimulus recording This setup is suitable when using a Tobii Eye Tracking system for eye tracking data analysis when the stimulus is presented from a separate computer or other RGB or VGA sources This could include a computer game a DVD player or when stimulus is pre sented on a computer running a different operating system The computer running Tobii Studio must be equipped with an addi tional video capture card Note that if the external application runs on the Windows operating system and it does not use 3D graphics accelera tion or it does not have a high processor load and high memory usage it may be more suitable and less complex to in stead run this on the same computer as Tobii Studio and use the Screen Recording option in Tobii Studio For this setup the image from the Tobii Studio computer has to be displayed on the screen during calibration to display the cali bration points The external stimulus computer however should be shown on the screen during the actual test Both devices must therefore be connected to the same screen To switch between the inputs use a switch or a screen that allows for multiple input sources The image shown on the screen must be sent to Tobii Studio to record the video stream and synchronize it with the gaze data If the stimulus is presented from an analogue video source e g a VCR or an analogue video camera
22. r 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 Timestamp GazePointXLeft GazePointYLeft CamXLeft CamYLeft DistanceLeft PupilLeft ValidityLeft GazePointXRight GazePointY Right CamXRight CamYRight DistanceRight PupilRight ValidityRight 8 3 Data Sample Output 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 Vertical screen position of the gaze point for the left eye Horizontal location of the left pupil in the camera image 0 is left edge 1 is right edge Vertical location of the left pupil in the camera image 0 is top 1 is bottom 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 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 betwee
23. 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 eye tracker comes in two different versions the Tobii X2 30 with a sampling rate of 30 Hz and the Tobii X2 60 with a sam pling rate of 60 Hz e The Tobii X2 30 and X2 60 Eye Trackers are small eye trackers measuring only 184 mm 7 2 in length It enables your portable eye tracking lab and studies that require an eye tracker to track even large objects at close distances up to 36 gaze angle Use the eye trackers to conduct studies on Laptops PC monitors up to app 25 16 9 Mobile devices Real world interfaces Projections simulators TV screens Tobii X2 30 Eye Tracker mounted on a laptop and a computer monitor laptop and monitor not included 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 mou
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