asl 501 manual

8/19/2019 ASL 501 Manual

1/91

Eye Tracking System

Instruction Manual

Model 501Head Mounted Optics

MANUAL VERSION 2 .0

8/19/2019 ASL 501 Manual

2/91

Applied Science Laboratories175 Middlesex Turnpike

Bedord! MA "17#"p$one% 7&1'(75)*"""+ ax% 7&1'(75)##&&+ email% ASL,A)S)L-com

ASL#1")M)..7"1"("./opyrig$t 0 1..7! 1..&!1...! (""" by Applied Science roup! Inc-

1-

8/19/2019 ASL 501 Manual

3/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 T A ! L E O " C O N T E N T #

Ta$le o% Contents

1& 'NTRODUCT'ON&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

& )ENERAL #Y#TEM DE#CR'*T'ON&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

&1 Ma+o, Asse-$lies&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

&1&1 Hel-et o, Head$and&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

&1& E/e Ca-e,a Optics Module&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

&1& iso, Asse-$l/&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

&1&2 Head Mounted #cene Ca-e,a Asse-$l/ (HM#C&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

&1&5 Model 5000 E/e T,ac3in4 #/ste- Cont,ol Unit&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&12

&1& Monito,s&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&15

&1&. E/e T,ac3e, 'nte,%ace *C (Cont,olle,&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&15

&1&6 #o%t7a,e&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&15

& 'nte,%ace Desc,iption&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

& Options&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

&&1 Mo$ile E/e T,ac3e, Cont,ol Unit (-odel 5000*&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

&& Ma4netic Head T,ac3in4 Ha,d7a,e (MHT&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1

&& Ma4netic T,ans-itte, )i-$al -ount (EH) and lase, 7and (EHL&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1.

&&2 EYEHEAD 'nte4,ation #o%t7a,e (EH&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1.

&&5 #tationa,/ #cene Ca-e,a #o%t7a,e (##C&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1.

&& Hi48 #peed ideo (H#&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&1.

& 'N#TALLAT'ON&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&16

&1 Unpac3in4 and Asse-$l/&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&16

&1&1 Cont,ol Unit Unpac3in4&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&16

&1& Hel-et (o, Head !and Unpac3in4&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&16

&1& E/e T,ac3e, 'nte,%ace *C&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&16

&1&2 Ma4netic Head T,ac3e, (optional&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&19

& 'nte,connections&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&0

&&1 Hel-et o, Head!and Connections&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

&& E/e T,ac3e, 'nte,%ace *C Connections&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

&& Monito,s&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

&&2 Ma4netic Head T,ac3e, Connection (Optional&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&2

& #o%t7a,e 'nstallation&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&2

2& EYE:TRACKER 'NTER"ACE #O"T;ARE&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

2&1 Upload so%t7a,e to t8e -odel 5000 E/e T,ac3e, Cont,ol Unit&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

2& E5000 Use, 'nte,%ace *,o4,a-&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

2&&1 Use, 'nte,%ace #c,een&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

2&& #/ste- #ettin4s&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&9

i

8/19/2019 ASL 501 Manual

4/91


2&& #a

8/19/2019 ASL 501 Manual

5/91


&1&1 'nte,%ace Ca$le&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

&1& *,otocol and data %o,-at&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

& Analo4 data output&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&2

.& THEORY O" O*ERAT'ON&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

.&1 *upil and CR Reco4nition&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

.& E/e Line o% )ae Co-putation&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.

.& Ti-in4&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&9

6& "AULT D'A)NO#'#&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.2

6&1 )ene,al App,oac8&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.2

6& "unctional #/ste- Desc,iption&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.2

6& "unctional *,io,ities&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.2

6&2 *,eli-ina,/ T,ou$le #8ootin4&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.5

6&5 Usin4 t8e -odel e/e&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.5

9& #*EC'"'CAT'ON#&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&..

iii

8/19/2019 ASL 501 Manual

6/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 T A ! L E O " " ' ) U R E #

Ta$le o% "i4u,es

2igure ()1- Sc$ematic s$o3ing model 5"1 eye tracking system 3it$ optional magnetic $ead tracker! and indirect4parallax ree scene camera----------------------------------------------------------------------------------------------------------------------- (

2igure ()(- /omponents o model 5"1 eye tracker and optional magnetic $ead tracker------------------------ ------- ------- -----*2igure ()#- Model 5"1 componenets! s$o3ing 6type)(6 optics module! direct scene camera! and monocular isor--- -52igure ()*- Model 5"1 componenets! s$o3ing 8type 19 optics module 3it$ $ig$ speed camera option---------- ------- ----:2igure ()5- ;ptical pat$ or

8/19/2019 ASL 501 Manual

7/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 ' N T R O D U C T ' O N

1& 'NTRODUCT'ON

T$e Model 5"1! $ead mounted eye tracker is designed to accurately measure apersons eye line o gaFe 3it$ respect to t$eir $ead- T$e measurement is

displayed as a cursor or set o cross $airs superimposed on t$e image rom a$ead mounted scene camera 43$ic$ can be ideo taped! and may also berecorded digitally on t$e eye tracker Interace ?/! or exported as a real timeserial data stream to an external deice- Instrument speci@cations aresummariFed in section .-

$en combined 3it$ an optional $ead tracking deice and ASLHs EE

8/19/2019 ASL 501 Manual

8/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 ) E N E R A L # Y # T E M D E # C R ' * T ' O N

& )ENERAL #Y#TEM DE#CR'*T'ON

T$e Model 5"1 eye tracker 3it$ an optional magnetic $ead tracker isillustrated sc$ematically in 2igure (-1- T$e eye is illuminated by t$e beam

rom a near inrared source and t$e optical system ocuses an image o t$e eyeonto a solid state ideo sensor 4eye camera- Bot$ t$e illumination beam andt$e eye image are reKected rom a $elmet isor 3$ic$ is coated to be reKectiein t$e near inrared region and transmissie to isible lig$t- A second solidstate camera 4scene camera may be ocused on t$e scene being ie3ed by t$esub=ect- T$e illuminator! optics! and bot$ camera sense $eads are $elmetmounted- T$e eye camera sense $ead and illuminator are contained in a small$ead mounted optics module 4

8/19/2019 ASL 501 Manual

9/91


2igure ()1- Sc$ematic s$o3ing model 5"1 eye tracking system 3it$ optional magnetic $eadtracker! and indirect 4parallax ree scene camera

T$e model 5""" control unit processes t$e eye camera signal to extract t$eelements o interest 4pupil and reKection o t$e lig$t source on t$e cornea andcomputes bot$ pupil diameter and line o gaFe- T$ese data are displayed andoutput to external data ports- 2or a discussion o t$e principles used todetermine eye line o gaFe see Section 7! T$eory o ;peration-

?upil and corneal reKection outlines and center cross $airs are displayed ont$e pupil monitor oer t$e ideo image o t$e eye- Eye line o gaFe 3it$respect to t$e $elmet is displayed as a cursor or set o cross $airssuperimposed on t$e scene camera ideo image-

/alibration commands and most ot$er interaction 3it$ t$e operator take placet$roug$ t$e Eye Tracker Interace ?/ terminal- Cata may also be recorded ont$e Interace ?/ $ard disk! and processed later by user 3ritten programs or by ASLs data analysis programs 4EEDAL option-

T$e standard model 5"1 consists o items t$e listed belo3%

0

8/19/2019 ASL 501 Manual

10/91


• Model 5""" control unit and plug in po3er supply

•

8/19/2019 ASL 501 Manual

11/91


2igure ()(- /omponents o model 5"1 eye tracker and optional magnetic $ead tracker!

s$o3ing $ead mounted optics module 8type 19 3it$ large isor and parallax ree scene camera-

8/19/2019 ASL 501 Manual

12/91


2igure ()#- Model 5"1 componenets! s$o3ing 6type)(6 optics module! direct scene camera!

and monocular isor-

5

8/19/2019 ASL 501 Manual

13/91


2igure ()*- Model 5"1 componenets! s$o3ing 8type 19 optics module 3it$ $ig$ speed camera

option- T$e

8/19/2019 ASL 501 Manual

14/91


&1 Ma+o, Asse-$lies

&1&1 Hel-et o, Head$and

T$e standard $elmet is an ad=ustable sports)type $elmet modi@ed to includemounting suraces or t$e pupil camera optics module! a isor assembly! and ascene camera assembly- T$umbscre3s on eac$ side o t$e $elmet can beloosened to allo3 t$e ront and rear $ales o t$e $elmet moe to3ards ora3ay rom eac$ ot$er! proiding a siFe ad=ustment- T$e standard $eadband$as a knob to ad=ust t$e lengt$ o t$e $atband strap! and is eJuipped 3it$ t$esame eye tracker component mounting @xtures as t$e $elmet- Cepending ont$e particular $eadband used! t$e top strap may ad=ust 3it$ a knob or 3it$snaps- Dote t$at dierent types o $eadgear may also be used-

&1& E/e Ca-e,a Optics Module

T$e eye camera optics module is aailable in seeral dierent con@gurationsdepending upon t$e intended application and t$e particular $eadgear to beused- T$e most standard con@gurations are described in t$is manual! andot$ers are discribed in separate tec$nical notes or manual addendums- T$emost appropriate con@guration or a gien application s$ould be discussed! ona case by case basis! 3it$ ASL engineers-

6

8/19/2019 ASL 501 Manual

15/91


T$e optical pat$ depicted in @gure ()5 is or t$e standard optics module t$at3ill be reered to as 8

8/19/2019 ASL 501 Manual

16/91


2igure ():- 8Type 19 $ead mounted optics module 4

8/19/2019 ASL 501 Manual

17/91


usually mounted on t$e $eadgear so as to sit directly on top o t$e sub=ectHs$ead-

2igure ()7- Type 1

8/19/2019 ASL 501 Manual

18/91


2igure ()&- 8Type (9

8/19/2019 ASL 501 Manual

19/91


2igure ().- Type)( optics module lateral ad=ustment

2igure ()1"- 2ocus ad=ustment on type)( optics module

10

8/19/2019 ASL 501 Manual

20/91


2igure ()11- >otation o t$e type)( eye cameramodule and isor or ad=usting ertical image postion

and optical pat$ angle

&1& iso, Asse-$l/

T$e purpose o t$e isor assembly is to reKect t$e eye image to3ards t$e eyecamera and to reKect t$e scene image to3ards t$e scene camera 4in t$e caseo a parallax ree scene camera con@guration 3$ile appearing transparent tot$e $uman obserer- T$e inside surace o t$e isor 4surace closest to t$e

sub=ectHs ace is coated to be ery reKectie in t$e near inrared andtransmissie in t$e isible spectrum-

T$e isor usually used or t$e indirect 4parallax ree scene cameraarrangement is t$e large isor s$o3n in @gures (): and ()7- T$is isorproides a large surace area to reKect t$e scene image 4see @gure ()5- T$e isor is mounted on t3o telescoping arms 3it$ $inges on bot$ t$e isor and t$e$elmet mounting plates to allo3 or ery Kexible positioning- A black clot$glare s$ield is proided to reduce glare rom oer$ead lig$ting! and to preentt$e $ead mounted scene camera rom ie3ing ob=ects t$roug$ t$e isor- T$eglare s$ield astens 3it$ elcro to t$e top o t$e isor on end! and to t$e top o

t$e $ead band or $elmet on t$e ot$er-

T$e monocular isor assembly s$o3n in @gure ()& is attac$ed to t$e opticsmounting plate 3it$ a Kexible cable 4or 8boom9- T$e isor can be positioned ery Kexibly- It can rotate about t$e boom cable as s$o3n in @gure ()11- T$eboom cable slides and rotates 3it$in t$e bracket t$at astens it to t$e mountingplate as s$o3n in @gure ()1(- T3o small $ex set scre3s are used to ad=ust t$e

12

8/19/2019 ASL 501 Manual

21/91


riction o t$is mec$anism! and s$ould be set so t$at t$e aluminum s$at 4see@gure ()& slides 3$en @rmly pulled or pus$ed! but remains securely in placeot$er3ise- T$e boom cable can also be bent to ad=ust t$e isor position- $enbending t$e cable! use bot$ $ands to grip t$e cable on bot$ sides o t$e spot tobe bent- As 3it$ most 3ire cable! it must be bent slig$tly beyond t$e desired

point since it 3ill relax 4unbend slig$tly 3$en released-

2igure ()1(- Monocular isor cable slides up and do3n3it$ in mounting bracket-

&1&2 Head Mounted #cene Ca-e,a Asse-$l/ (HM#CT$e purpose o t$e $ead mounted scene camera 4

8/19/2019 ASL 501 Manual

22/91

8/19/2019 ASL 501 Manual

23/91


2igure ()15- Model 5""" Eye Tracker /ontrol nit rear panel

T$e control unit $ouses t$e processing board t$at receies ideo rom eye andscene cameras! recogniFes eatures in t$e ideo eye image and computes lineo gaFe! communicates 3it$ t$e Interace ?/! and superimposes eedback outlines! cross $airs! and cursors on t$e eye and scene ideo signals ormonitor display- $en an optional magnetic $ead tracker is used! t$isprocessing board also communicates 3it$ t$e $ead tracker and can use t$e$ead position data to compute gaFe 3it$ respect to @xed suraces in t$eenironment 4EE or ?AL i 5"

8/19/2019 ASL 501 Manual

24/91


recogniFed as t$e corneal reKection 4/>- A 3$ite set o cross $airs designatest$e center o t$e pupil and a black set designates t$e /> center-

T$e scene monitor presents a ideo image o t$e scene being ie3ed by t$esub=ect! 3it$ a cursor or set o cross $airs superimposed to indicate t$e

sub=ects point o gaFe-

&1&. E/e T,ac3e, 'nte,%ace *C (Cont,olle,

A computer may be supplied by ASL as part o a series 5""" eye trackingsystem! but is usually supplied by t$e user- T$e computer seres as t$e userinterace deice and as a data)recording deice- ASL al3ays supplies an EyeTracker Interace program! 3$ic$ runs on t$is computer! and t$e Interace ?/is a reJuired part o t$e system-

System reJuirements or t$e Interace ?/ are an IBM compatible ?/ capableo operation 3it$ indo3s .5! indo3s .&! indo3s DT! or C;S- Note,however, that a computer that can run only DOS is limited to using only the DOS version of ASL’s Eye Tracer !nterface "rogram- T$e computer must also$ae aailable /;M1 or /;M( serial ports using standard interrupts anddeice addresses- T$e minimum recommended system is a ("" MS(#( cable rom /;M1 on t$e ?/ to t$e 8/ontroller9 connector ont$e model 5""" control unit- I an optional magnetic $ead tracker is beingused it interaces 3it$ a serial 4>S(#( connection to t$e model 5""" controlunit connector labeled 8eal time serial 4>S(#( data can be

exported to an external deice ia t$e model 5""" control unit connectorlabeled 8Serial ;ut9 4t$e interace protocol is described in section :- T$e ideo images rom eit$er t$e scene or pupil monitor may also be ideo taped-

T$e port labeled CAT on t$e model 5""" control unit may be used to inputparallel digital data rom an external deice! or recording on t$e Eye TrackerInterace ?/ along 3it$ gaFe data-

16

8/19/2019 ASL 501 Manual

25/91


& OptionsCescribed belo3 are some additional components and sot3are options!aailable rom ASL! 3$ic$ may urt$er en$ance system operation-

&&1 Mo$ile E/e T,ac3e, Cont,ol Unit (-odel 5000*

T$e portable /ontrol nit measures 1-56$ x :-(563 x .-756d and 3eig$s only (lbs- T$e po3er s3itc$! po3er pilot lig$t! t$e 8/amera9 connector! and t$eScene ;ut and Eye ;ut monitor connectors are located on t$e ront panel- T$e8/ontroller9 connector! 8?o3er In9 connector and an unlabeled connector arelocated on t$e rear panel- T$e unlabeled connector is usually con@gured or$ead tracker input 4consult ASL or ot$er possibilities- A 1(GC/ po3er supplyunit is included! but a battery 3it$ 1(GC/ output and at least a (5 attcapacity may be used instead-

T$e mobile control unit is small enoug$ and lig$t enoug$ to be carried by t$esub=ect in a back pack! but does not support serial data output! CAT 4external

data input! or t$e $ig$ speed ideo option-

&& Ma4netic Head T,ac3in4 Ha,d7a,e (MHT

T$e magnetic $ead tracking option 4M

8/19/2019 ASL 501 Manual

26/91


&&2 EYEHEAD 'nte4,ation #o%t7a,e (EH

EE

8/19/2019 ASL 501 Manual

27/91


and scene cameras are completely decoupled and do not need to s$are t$esame ideo ormat- Cigital data is recorded at t$e eye camera update rate-

(1

8/19/2019 ASL 501 Manual

28/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 'N # T A L L A T 'O N

& 'N#TALLAT'ON

&1 Unpac3in4 and Asse-$l/

&1&1 Cont,ol Unit Unpac3in4

1& Locate t$e model 5""" Eye Tracker /ontrol nit and un3rap t$eprotectie material- Be sure t$at t$e po3er s3itc$ on t$e ront panel isin t$e ;22 4do3n position-

& Locate t$e 8

8/19/2019 ASL 501 Manual

29/91


&1& E/e T,ac3e, 'nte,%ace *C

I t$e Eye Tracker Interace ?/ $as been supplied by ASL! locate t$e computer!monitor! keyboard! and mouse! and assemble in t$e usual as$ion- I suppliedby ASL! t$e computer 3ill 3ill $ae eye tracker sot3are pre)installed-Sot3are installation and operation procedures are discussed urt$er on- It is

assumed t$at t$e user is amiliar 3it$ standard ?/ assembly and operation- I not! please consult ASL-

&1&2 Ma4netic Head T,ac3e, (optional

T$e magnetic $ead tracker 4M

8/19/2019 ASL 501 Manual

30/91


& 'nte,connections2igure #)1 s$o3s interconnections or a standard model 5"1 eye tracker 3it$type)1 optics module and a magnetic $ead tracker- 2igure #)( s$o3s t$e sameinterconnections or t$e type)( optics module! and @gure #)# diagrames t$eseinterconnections 3$en t$e type)1 optics module is used 3it$ a $ig$)speed

camera- Interconnections or ot$er system con@gurations are s$o3n in

2igure #)1:- Interconnections or model 5"1 Eye Tracking system 3it$ type)1 optics moduleand optional magnetic $ead tracker

1&1 (2

8/19/2019 ASL 501 Manual

31/91


separate manual addendums or tec$nical notes- /onsult ASL i t$ere areJuestions about a speci@c system-

2igure #)17- Interconnections or model 5"1 Eye Tracking system 3it$ type)( optics moduleand optional magnetic $ead tracker

(

8/19/2019 ASL 501 Manual

32/91


2igure #)1&- Interconnections or model 5"1 Eye Tracking system 3it$ type)1 optics module!$ig$ speed camera! and optional magnetic $ead tracker

(5

8/19/2019 ASL 501 Manual

33/91


&&1 Hel-et o, Head!and Connections

1& Be sure t$at system po3er is ;22-

& 2ind t$e camera'control)unit cable- It $as (5 pin C type connector atone end! and multiple connectors at t$e ot$er- T$e standard lengt$ is

7-: meters 4(5 t- alt$oug$ ot$er lengt$s are aailable 4consult ASL-

& ?lug t$e (5 pin C type connector into t$e connector labeled 8/ontroller9on t$e model 5""" Eye Tracker /ontrol nit-

2& At t$e ot$er end o t$e cable use t$e color codes and t$e @gure #)1! #)(!or #)# diagram to connect t$e ideo and po3er connectors to appropriatein)line cable connectors rom t$e t$e eye and scene cameras- In t$e caseo a $ig$)speed eye camera! t$e cables connect directly to t$e $ig$ speedeye camera electronics unit as s$o3n in @gure #)#- I no scene camera3ill be used leae t$e scene camera leads unconnected-

5& I using a type)1 optics module 4@gure #)1 or #)# t$e illuminator cableconnects directly to t$e illuminator tube 4see @gures (): and ()7 on t$eoptics module- T$e illuminator cable lead $as a small! t3o pin connector-;ne side o t$is connector is marked by a red dot- T$ere is a matingconnector at t$e end o t$e illuminator tube! also marked 3it$ a red dot-/onnect t$e cable to t$e illuminator tube! being sure t$at t$e red dotsare aligned- I t$e cable is plugged in upside do3n! t$e illuminator LECmay be burned out 3$en po3er is applied- T$e red dot on t$e cablemust be on t$e same side as t$e red dot on t$e illuminator tube- A smallsetscre3 near t$e end o t$e illuminator tube can be tig$tened to $oldt$e connector in place-

& T$ere are Gelcro tabs and'or cable ties 3it$ strain relie @xtures t$at areused to strain reliee t$e cables extending rom t$e eye and scenecameras- T$e precise arrangement aries depending upon exactly 3$attype o $eadgear $as been used- Be sure t$e t$e strain relie system isused! and t$at t$ere is a suiciently long loop in t$e cable! bet3een t$estrain relei and t$e eye or scene camera! so t$at eye camera moduleand scene camera are ree to moe oer t$eir ull range o ad=ustment-

&& E/e T,ac3e, 'nte,%ace *C Connections

se t$e proided cable to connect t$e port labeled 8/ontroller9 on t$e model5""" Eye Tracker /ontrol nit to t$e /;M1 or /;M( port on t$e Interace ?/-2or use 3it$ $ead mounted optics! be sure t$at t$e 8

8/19/2019 ASL 501 Manual

34/91


&& Monito,s

/onnect a ideo cable rom t$e eye monitor ideo input! to t$e control unitconnector labeled 6Eye ;ut9- /onnect a ideo cable rom t$e scene monitor ideo input! to t$e control unit connector labeled 6Scene ;ut9- I monitors$ae been supplied by ASL! and i t$e $ead mounted scene camera is

con@gured in t$e parallax ree 4indirect mode! one monitor 3ill $ae a s3itc$on t$e back labeled 8normal'reerse9- Be sure to connect t$is monitor as t$escene monitor-

&&2 Ma4netic Head T,ac3e, Connection (Optional

T$e transmitter 4source and sensor modules attac$ to t$e clearly labeledconnectors on t$e M

8/19/2019 ASL 501 Manual

35/91


A separate Koppy disk labeled 8A//ESS9 3ill contain / language subroutines!or accessing binary data @les recorded by t$e EE?;S sot3are

T$e data analysis sot3are 4EEDAL is supplied on a set o t$ree # inc$ Koppydisks labeled EEDAL- I t$e Eye Tracker Interace ?/ $as been supplied by

ASL t$e analysis sot3are 3ill be installed in a sub)directory 6EEDAL6- I not!simply copy t$e entire contents o EEDAL disks 1 and ( onto a single $arddisk sub)directory- se o t$e data analysis sot3are is explained in a separate8EEDAL9 manual-

A utility or conerting binary data @les created by t$e ?/ interace program to AS/II ormat is included as part o t$e EEDAL data analysis sot3arepackage- Separate operating instruction manuals are proided or EEDALand 2ix?lot-

I desired! use indo3s Explorer to make s$ortcuts or t$e @les called8E5in-exe9 and 8Load-bat9! in t$e EE?;S directory! and 8drag t$eses$ortcut icons onto t$e desktop or more conenient use- I running underindo3s DT! use 8LoadRnt-bat9 instead o 8Load-bat9-

T$e Load-bat 4or LoadRnt-bat unction 3ill run in a C;S 3indo3 4or8command line 3indo39 i running under DT! and it 3ill be most conenient i Load-bat is set so t$at it 3ill automatically close t$e C;S 3indo3 3$en it is@nis$ed- To c$eck t$is! rig$t click on t$e 8Load-bat9 in indo3 Explorer andselect 8?roperties9- Select t$e 8?rogram9 tab and be sure t$at t$ere is a c$eck in t$e 9/lose on exit9 c$eck box! t$en click 8;O9 to close t$e 8?roperties93indo3- I a s$ortcut Icon 4s$ortcut to 8Load-bat9 $as been put on t$e desk top! repeat t$e procedure or t$e s$ortcut- >ig$t click on t$e s$ortcut Icon!

select 8?roperties9 and c$eck 8/lose on exit9-

I t$e 8/ontroller9 port on t$e model 5""" eye tracker control unit is connectedto a ?/ /;M port ot$er t$an /;M1! t$en Load-bat 4or LoadRnt-bat must bemodi@ed as ollo3s- se a text editor 4or example! Micorsot Dotepad to ie3Load-bat! in t$e EE?;S directory- T$e @le contains one line as s$o3n belo3-

@upload e5vvv.bxt e5vvv.lxr

T$e letters s$o3n as 89 are @le ersion numbers 3ill dier depending ont$e sot3are ersion in use- Ater 8upload9 insert a space ollo3ed by 8'?%n9

3$ere n is t$e desired /;M port number- 2or example! to use /;M( modiyt$e @le to read%

@upload /P:2 e5vvv.bxt e5vvv.lxr

As preiously discussed in section (-1-5! system reJuirements are an IBMcompatible ?/ capable o operation 3it$ indo3s .5! indo3s .&! or

(9

8/19/2019 ASL 501 Manual

36/91


indo3s DT! i using t$e indo3s eye tracker interace or C;S i using t$eC;S eye tracker interace- T$e computer must also $ae aailable /;M1 or/;M( serial ports using standard interrupts and deice addresses- T$eminimum recommended system is a ("" M

8/19/2019 ASL 501 Manual

37/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 ' N T E R " AC E # O " T ; A R E

2& EYE:TRACKER 'NTER"ACE #O"T;ARE

T$e EE?;S 4E5""" sot3are package contains sot3are t$at must beuploaded to t$e model 5""" eye tracker control unit as 3ell as a user interace

program t$at runs on t$e Eye Tracker Interace ?/- T$e ollo3ing sectionsassume t$at all appropriate interconnections $ae been made and sot3areinstalled! as described in section #- T$is manual also assumes t$at indo3sinterace program 4e5in 3ill be used- A manual can be proided by ASL!upon reJuest! t$at describes system operation in terms o t$e C;S Interaceprogram 4e5"""- -

2&1 Upload so%t7a,e to t8e -odel 5000 E/e T,ac3e, Cont,ol Unit?o3er up t$e model 5""" control unit- I it is already po3ered up! use t$epo3er s3itc$ to po3er cycle it o and back on again to be sure t$at it is8reset9- S3itc$ on t$e po3er s3itc$ at t$e rear o t$e pan'tilt module-

pload sot3are to t$e model 5""" eye tracker control unit by running Load#'at- T$is can be done by any o t$e ollo3ing met$ods%

∃ use indo3 Explorer to display t$e EE?;S directory! and double click t$e @le name load#'at!

∃ open a C;S 3indo3 4select 8MSC;S prompt9 under Start! ?rograms!use t$e C;S c$ange directory command to c$ange to t$e EE?;Ssubdirectory! and type LoadEnte!"!

∃ or double click t$e desktop s$ortcut icon or Load#'at 4assuming t$at as$ortcut icon 3as created as suggested in t$e Installation section-

D;TE% I running under indo3s DT! ollo3 t$e same instructions! but use Load(nt#'at instead o Load#'at-

In all cases! t$e upload program 3ill begin to execute in a C;S box 4or in a8command line9 box i running under DT-

T$e ?/ monitor 3ill display

UPLOAD Vn.n - Program/Pattern upload program for ASL ETE

Loading: path/E5nnn.BXT (nnnnn bytes)bytes left: nnnnn

T$e 8bytes let9 number 3ill count do3n to Fero and t$en t$e ?/ monitor 3illdisplay

01

8/19/2019 ASL 501 Manual

38/91


Done

Loading: path/E5nnn.LXR (nnnnn bytes)bytes left: nnnnn

T$e 8bytes let%9 alue 3ill count do3n to Fero and t$e monitor 3ill display-

Done

"- I Load-bat 4or LoadRnt-bat properties 3ere set to 8/lose on Exit9 aspreiously described! t$e C;S 3indo3 3ill automatically close- I not! be sureto close t$e C;S 3indo3 4by clicking t$e 89 in t$e upper rig$t corner beoreproceeding-

1- ;nce t$e control unit $as been 8loaded9 t$e on board sot3are 3illcontinue to run until po3er is turned o- I an attempt is made to reload t$econtrol unit 3it$out @rst resetting it 4by cycling po3er! an error message 3ill

appear on t$e ?/ monitor and no upload 3ill take place-

T$e user interace ?/ sot3are! described in t$e ollo3ing section! is needed toc$ange settings suc$ as pupil and corneal reKection discrimination t$res$olds!launc$ procedures suc$ as calibration! and to record data on t$e interace ?/- All eye tracking unctions are perormed by t$e model 5""" control unit- ;nceproper settings are establis$ed! and i data is not being recorded on t$einterace ?/! t$e eye tracker 3ill continue to unction normally een i t$ecable to t$e interace ?/ is disconnected-

2& E5000 Use, 'nte,%ace *,o4,a-

;nce sot3are $as been successully uploaded to t$e model 5""" eye trackercontrol unit 4as described in t$e preious section run t$e interace program bydouble clicking t$e e%win#e$e @le in indo3s Explorer 4EE?;S directory! orby double clicking t$e corresponding s$ortcut icon on t$e desktop 4assuming as$ortcut icon 3as created as suggested in t$e Installation section- I t$e ?/ iscorrectly connected to a model 5""" control unit and sot3are $as successullybeen uploaded to t$e control unit 4as described in t$e preious section t$e8;nline9 lig$t! near t$e top let o t$e interace program screen sho#ld $eg!een-

Note that a DOS interface program e%)))#e$e can 'e used instead of e%win#

Simply dou'le clic e%)))#e$e, in the E*E"OS directory, instead of e%&in#e$e# A separate manual is availa'le from ASL that descri'es system operation interms of DOS !nterface# This manual assumes that e%&in is 'eing used#

To exit 4close t$e interace program! click t$e 8X9 at t$e upper rig$t o t$eprogram 3indo3! select 8close9 rom t$e pull do3n 82ile9 menu! or typeAlt"% --

0(

8/19/2019 ASL 501 Manual

39/91


2&&1 Use, 'nte,%ace #c,een

T$e main interace program 3indo3 $as a menu bar at t$e top! a s$ortcut bardirectly underneat$ t$e menu bar! a column o controls extending do3n t$e letside o t$e screen! t3o grap$ics 3indo3s labeled 8eye9 and 8scene ?;9 to t$erig$t o t$e control column! and some additional digital inormation displays

belo3 t$e grap$ics 3indo3s-

2igure *)1.- e5in screen )) main 3indo3

T$e controls consist o standard 3indo3s slide s3itc$es! c$eck boxes! andradio buttons- T$e data displays consist o indicator lig$ts 4to indicate 8on)line9 or 8o)line9! and pupil and /> recognition! and text 3indo3s displaying/;M port assignment! ?/ time o day! elapsed time! ree disk space! point o

gaFe coordinates! pupil diameter! external data alues 4CAT! and data @leinormation- T$e 8on)line9 indicator lig$t and /;M port assignment displaysare at t$e top o t$e control column- T$e rest o t$e data displays are beneat$t$e t3o grap$ics 3indo3s- I a magnetic $ead tracker is connected andenabled! an additional data display appears beneat$ t$e Scene ?; 3indo3s$o3ing $ead tracker position and orientation coordinates- I t$e system is a$ead mounted eye tracker 4Model 5"1 3it$ a magnetic $ead tracker! and i

00

8/19/2019 ASL 501 Manual

40/91


Eye$ead Integration is enabled! Eye$ead scene plane number! point o gaFecoordinates! and distance rom t$e eye to t$e scene plane are also displayedunder t$e Scene ?; 3indo3-

T$e 8eye9 grap$ics display at t$e top! let side o t$e screen! s$o3s pupil and

corneal reKection 4/> center positions and diameters! as detected by t$e eyetracker- T$e pink pupil center cross $airs and blue /> center cross $airs areessentially t$e same as t$e 3$ite and black cross $airs t$at s$o3 pupil and /> centers on t$e eye ideo monitor- The pupil and + circles are not the same asthe pupil and + outlines displayed on the video monitor# The computer display simply draws circles a'out the cross hair positions with diametersproportional to detected pupil and + diameters# These circles do not showthe actual pupil and + outlines detected 'y the eye tracer# True outlines aredisplayed on the video eye monitor#

Anot$er grap$ics 3indo3! labeled 6Scene ?;6 and located near t$e top rig$to t$e screen! s$o3s a point o gaFe cursor- T$is is essentially t$e same as t$ecursor moement on t$e ideo scene monitor-

I t$e model 5""" control unit is not running 4po3ered o or reset or i t$ecable connecting t$e interace ?/ to t$e control unit is disconnected! t$e lig$tlabeled 8;n line9! at t$e top let o t$e screen 3ill turn red- I t$ecommunication is reestablis$ed! or example by reconnecting t$e cable! t$islig$t 3ill c$ange back to green-

2&& #/ste- #ettin4s

02

8/19/2019 ASL 501 Manual

41/91


?ull do3n t$e /on@gure menu by clicking on 8/on@gure9 in t$e menu bar att$e top let o t$e screen! and select 8System Settings9 to pop up t$e SystemSettings dialog 3indo3 4see @gure *)(- se t$e radio buttons in t$e box

labeled 8System Type9 to select t$esystem type t$at reKects t$e current

$ard3are con@guration- 2or a model 5"1eye tracker t$is 3ill usually be 8

8/19/2019 ASL 501 Manual

42/91


T$e c$eck boxes on t$e System Settings 3indo3 s$ould usually be letunc$ecked- T$e 17 point calibration capability is explained in section 5-1" andt$e auto Eyedat unction is explained in section 5-&- 8se Metric System9applies only to setup o a magnetic $ead tracker or use 3it$ pan'tilt optics! asdiscussed in section 5-1-#- T$e ot$er t3o c$eck boxes do not apply to pan'tilt

optics and s$ould be let unc$ecked-

T$e 8Scene Gideo Source9 radio button s$ould normally be let on 8AutoSelect9 3$en using pan'tilt optics- $en 8System Type9 is set to 8?an'Tilt;ptics9 or 8?an'Tilt ;ptics 3it$ Memote Scene9 connector! on t$e control unit rear panel! as t$escene ideo source- 4$en using

8/19/2019 ASL 501 Manual

43/91


corresponding pull do3n menu- 2or E5"""-/AL! use t$e 6/alibrate6 menu+ orE5"""-/2! use t$e 6/on@guration6 menu+ or E5"""-EDG! use t$e 6Eye)ead6 rom t$e6/alibrate6 menu! bro3se to t$e preiously saed @le! $ig$lig$t it and click ;penU- It 3ill be used as t$e current data until oer3ritten by a ne3calibration-

I preerred! t$e same @le manipulations can be done 3it$ indo3s Explorer-Simply copy t$e E5"""-$$$ @le to a dierent name to sae it! and copy it back to E5"""-$$$ 4in t$e same directory as t$e E5in program to re)use it-

2&&2 Ena$lin4 Ma4netic Head T,ac3e, (Optional

T$e ollo3ing section applies only i an optional magnetic $ead tracking 4M

8/19/2019 ASL 501 Manual

44/91


T$e 8Enable9 menu selection as 3ell as t$e M

8/19/2019 ASL 501 Manual

45/91

8/19/2019 ASL 501 Manual

46/91

E Y E T R A C K E R M A N U A L ( M O D E L 5 0 1 E Y E T R A C K E R O * E R A T ' O N

5& EYE TRACKER O*ERAT'ON

In order to successully operate t$e eye tracker in t$e standard as$ion t$eollo3ing steps are necessary-

1& T$e model 5""" eye tracker control unit must be po3ered up and loaded3it$ sot3are rom t$e Interace ?/! and t$e E5in user interaceprogram must be started- I an optional magnetic $ead tracker is beingused it must be actiated-

& A calibration target point pattern must be entered using t$e Ein userinterace program 4i appropriate alues are not already stored on t$edeault calibration @le-

& T$e sub=ect must don t$e $elmet or $eadband and t$e optics module! isor! and scene camera must be properly positioned-

2& T$e illuminator intensity and pupil and /> discriminators must beproperly set using t$e E5in user interace program-

5& A sub=ect calibration procedure must be executed-

& Eye moement monitoring% t$e test! experiment! or mission may beperormed-

Step 1 3as described in t$e preious c$apter 4sections *-1 and *-(-:- T$eollo3ing sections proide a detailed description o t$e remaining steps-

Sections 5-: and 5-7 describe some non standard met$ods or using t$esystem! and section 5-& notes arious ideas t$at s$ould be considered in day)to)day system operation-

T$ere are some additional procedures needed to implement t$e optionalEE

8/19/2019 ASL 501 Manual

47/91


sho#ld $e 'he'(ed- I t$e scene monitor is not set or 6reerse6 ideo display!t$e calibration target point numbering described in t$is section 3ill beincorrect- T$e ollo3ing assumes use o $ead mounted optics-

Curing t$e calibration procedures described later in section 5-# it 3ill be

necessary or t$e sub=ect to look at nine target points t$at are at kno3npositions- T$e locations o t$ese points must be entered into computermemory 3it$ a procedure called 8set target points9! and may be c$ecked 3it$a procedure called 8c$eck target points9- T$e set target point procedure canbe repeated or eac$ sub=ect! or t$e points may be put into system memory inadance! and t$en transposed onto t$e sub=ects @eld o ie3- T$ese met$odsor using t$e set target point procedure are described later! in sections 5-#-1and 5-#-(+ but @rst! t$e set and c$eck target point procedures t$emseles aredescribed belo3-

enerally! t$e calibration target points coer about &" percent o t$e scenemonitor screen area and are spaced 15)(" degrees isual angle $oriFontallyand 1")15 degrees ertically- ;ptimally! t$e middle ertical and $oriFontalpoints s$ould be collinear and perpendicular- T$ese are ideal speci@cations-/ompromises 3ill oten $ae to be made 3it$ no serious conseJuences- Allpoints must be numbered rom let to rig$t+ 1)# or t$e top ro3! *): or t$emiddle ro3 and 7). or t$e bottom ro3 4see @gure 5-1-

I using EE

8/19/2019 ASL 501 Manual

48/91


t$e e5in screen- T$is is discussed ut$er in t$e ollo3ing subsection! and int$e separate EE

8/19/2019 ASL 501 Manual

49/91


it is recommended t$at 8Set target points9 be used to enter a pattern o pointssimilar to t$at s$o3n in @gure 5)1- In t$is case! it is suicient to click in aroug$ly rectangular pattern by looking at t$e cursor position on t$e E5in8Scene ?;9 3indo3-

;nce all target points $ae been entered click 8Sae target points and /$eck9to sae t$e points and bring up t$e 8/$eck Target ?oints9 3indo3 4see nextsection! or t$e 8Sae target points and Wuit9 button to sae t$e points andclose t$e Set Target ?oints 3indo3- To close t$e Set Target ?oints 3indo33it$out saing t$e points =ust speci@ed! click 8Wuit 3it$out saing Target?oints9-

5&1& C8ec3 Cali$,ation Ta,4et *oints

?op up t$e 8/$eck Target ?oint9 dialog 3indo3 by selecting 8/$eck Target?oints9 rom t$e /alibrate menu! by clicking t$e /$eck Target ?oints icon on

t$e s$ortcut bar 4. point pattern 3it$ red c$eck mark ! or by selecting

8Sae target points and /$eck9 ont$e Set Target ?oint 3indo3- se t$eup and do3n arro3s next to t$e8/urrent ?oint%9 indicator to selectt$e desired point number- T$eindicated point 3ill be displayed onbot$ t$e interace program SceneCisplay 3indo3 and t$e ideo scene

monitor- T$e 8S$o3 all ?oints9 button can be used to display all points at onceon t$e interace program Cisplay indo3! but only t$e indicated 8/urrent?oint9 3ill appear on t$e ideo scene monitor display-

se t$e 8Set Target ?oints9 button to bring back t$e Set Target ?oint 3indo3!or t$e 8Cone9 button to simply close t$e /$eck Target ?oints 3indo3-

5& #u$+ect #etupT$e perormance o t$e $elmet mounted eye tracker system depends greatlyon initial preparation and ad=ustments- Alt$oug$ a s$ort learning cure isreJuired! typically a sub=ect s$ould be ready or eye moement monitoring3it$in a e3 minutes-

5&&1 )ene,al *,epa,ation

Arrange a set up and calibration station 3it$in easy ie3 o t$e control unitmonitors-

8/19/2019 ASL 501 Manual

50/91


5&& Donnin4 t8e Hel-et o, Head$and

I using t$e large isor! s3ing t$e isor up to3ards t$e top o t$e $elmet or$eadband- I using t$e boom arm mounted! indirect 4parallax ree scenecamera! s3ing t$e scene camera a3ay rom t$e ront o t$e $elmet or$eadband- I using t$e monocular isor! rotate t$e boom 3ire knob slig$tly

4see @gure ()& to moe t$e isor slig$tly a3ay rom t$e sub=ectHs ace- I usingt$e $eadband turn t$e $at band knob at t$e back o t$e $eadband so t$at t$estrap is all t$e 3ay opened 4usually counter clock3ise-

Hel,et: it$ t$e isor and scene camera saely out o t$e 3ay! $old t$e oert$e sub=ect so t$at t$e sub=ect can grab t$e $elmet straps and gently pull t$e$elmet on- T$e $elmet s$ould eel comortable and s$ould not 3obble or beoerly loose 3$en t$e c$instrap is astened- I using t$e standard sports type$elmet proided by ASL! t$e siFe can be ad=usted by loosening * scre3s oneac$ side o t$e $elmet! and pus$ing t$e ront and rear $ales closer toget$er!or pulling t$em apart- I t$e $elmet cannot be made small enoug$ 3it$ t$e

proided ad=ustment! it may be necessary to attac$ oam pads o aryingt$ickness to t$e interior o t$e $elmet to ensure a more snug @t- I a brasscounter 3eig$t $as been proided! attac$ t$e counter 3eig$t to t$e Gelcro att$e back o t$e $elmet- 0Note1 a counter weight is provided only for systemsthat re2uire relatively heavy components at the front of the helmet# !n mostcases the helmet3mounted components are now light enough and well enoughpositioned that counter 'alancing is not re2uired# !n special cases, the counter weight will help to 'alance the headgear, and may signi4cantly improvecomfort#5

Head$and: it$ t$e isor and scene camera saely out o t$e 3ay! and 3it$

t$e $at band strap all t$e 3ay opened! $old t$e $ead band by t$e top strap andgently lo3er it onto t$e sub=ects $ead- I possisble! ad=ust t$e top strap so t$at3$en t$e top strap rests on t$e sub=ectHs $ead! t$e $at band strap rests about a$al inc$ aboe t$e sub=ectHs eye bro3s- I 3ell balanced t$e $at band strapcan remain Juite loose allo3ing maximum comort oer time-

;nce t$e $ead gear is on! be sure t$at t$e 8

8/19/2019 ASL 501 Manual

51/91


By $olding t$e isor support arms use t$e support arm $inges to bring t$e isor do3n in ront o t$e sub=ects eyes- It may be necessary to t$en grab $oldo t$e isor itsel and use t$e isor $inges to s3ing it to about a *5)degreeangle under t$e optics module and in ront o t$e eyes- T$e bottom o t$e isors$ould be ery close to! but not touc$ing! t$e sub=ectHs nose- To aoid leaing

@ngerprints on t$e isor! be sure to $old t$e isor by its edges! neer on itssurace-

se t$e $oriFontal ad=ustment knob to position t$e optics module ie3ingaperture oer t$e ertical axis o t$e let eye- T$e pupil image s$ould appearas a brig$t disk on t$e eye monitor- I t$ere is no pupil image on t$e eyemonitor! some ot$er acial eature or skin 3ill probably be isible- I not! it maybe necessary to rotate t$e optics module 3it$in t$e illuminator tube clamp! sot$at t$e optics module ie3ing aperture points more to3ards! or more a3ayrom t$e sub=ects ace! or to ad=ust ocus by lengt$ening or s$ortening t$etelescoping camera ocus tube- To turn t$e optics module 3it$in t$e

illuminator tube clamp! $old and turn t$e beam splitter barrel- I t$e opticsmodule 3ill not turn easily 3it$in t$e illuminator tube clamp! C; D;T 2;>/EIT+ loosen t$e $ex scre3 t$at tig$tens t$e clamp- $en ad=usting cameraocus! careully pus$ or pull t$e camera $ousing 3it$ respect to t$e ocus tubeusing t$e let $and! 3$ile $olding t$e triangular prism $ousing 4see @gure (-53it$ t$e rig$t $and- >apidly rotating t$e camera back and ort$ a ery slig$tamount about its optical axis usually makes it easier to simultaneously s$orten4pus$ in or lengt$en 4pull out t$e telescoping ocus tube-

Ad=ust t$e isor and'or module rotation so t$at t$e eye pupil image is erticallycentered on t$e monitor- otate t$e camera until t$e eye appears rig$t side up and leel on t$eeye monitor- Be sure t$at t$e eye image obtained on t$e eye monitor is rig$tside up-

2ocus t$e pupil by careully pus$ing or pulling t$e camera $ousing 3it$in t$e

ocus tube using t$e let $and! 3$ile $olding t$e prism $ousing 4see @gure (-53it$ t$e rig$t $and- As t$e image comes into good ocus! t$e corneal reKection4/> s$ould become isible as a small spot t$at is een brig$ter t$an t$e pupil-T$e /> is t$e reKection o t$e illuminator lig$t source on t$e ront surace o t$e cornea- I t$e sub=ect is looking straig$t a$ead! t$e /> s$ould appearslig$tly belo3 t$e center o t$e brig$t pupil but still 3it$in t$e pupil circle- To

2

8/19/2019 ASL 501 Manual

52/91


ac$iee best ocus! attempt to make t$e /> image on t$e pupil monitor assmall and as round or crisp as possible-

Initial positioning -ith ype/2 Opti's Mod#le and ,ono'#la! viso!

Ask t$e sub=ect to look straig$t a$ead! and moe t$e optics module laterally

4see @gure ().! along t$e doe tail track! to position t$e optics moduleaperture 4small $ole on t$e bottom surace o t$e module! directly belo3 t$ebeam splitter ad=ustment plate directly oer t$e sub=ectHs pupil- Tilt t$e opticsmodule and position t$e isor approximately as s$o3n in @gure 5)( 4also see@gure ()11- Be sure t$e eye camera module is pointing at t$e isor-

Looking at t$e eye monitor! try to ad=ust t$e optics to @nd! ocus! and centert$e pupil image- T$e pupil image s$ould appear as a brig$t disk on t$e eyemonitor- I t$ere is no pupil image isible! some ot$er acial eature or skin 3illprobably be isible- Moe t$e image up or do3n by rotating t$e isor about t$e$oriFontal axis t$at is parallel to t$e plane o t$e sub=ectHs ace! as s$o3n in@gure ()11! or by rotating t$e eye camera module about a $oriFontal axis as

s$o3n in t$e same @gure- Moe t$e image rom side to side by ad=usting t$e isor tilt 4about t$e $oriFontal axis t$at is perpendicular to t$e sub=ectHs ace!or by moing t$e module small amounts along t$e doe tail track 4as in @gure().- Dote t$at tilting t$e isor to moe t$e image rom side to side reJuiresbending t$e Kexible boom-

2igure 5)(#- Dormalposition 4approximate o t$etype)( eye camera moduleand isor-

25

8/19/2019 ASL 501 Manual

53/91


2ocus by moing t$e camera urt$er in or out o t$e ocus tube as s$o3n in@gure ()1"- >otate t$e camera 3it$in t$e ocus tube to make t$e eye imageappear rig$t side up and straig$t- As t$e eye image comes into good ocus! t$ecorneal reKection 4/> s$ould become isible as a small spot t$at is eenbrig$ter t$an t$e pupil- T$e /> is t$e reKection o t$e illuminator lig$t source

on t$e ront surace o t$e cornea- I t$e sub=ect is looking straig$t a$ead! t$e/> s$ould appear slig$tly belo3 t$e center o t$e brig$t pupil! but 3it$in t$epupil circle- To ac$iee best ocus! attempt to make t$e /> image on t$e pupilmonitor as small and as round or crisp as possible-

1ine ad#st,ents

Grtical eye tracking range 3ill be maximiFed 3$en t$e camera optical pat$ isbelo3 t$e sub=ectHs central line o gaFe- $en t$e sub=ect is looking straig$ta$ead 4at t$e center o t$e @eld o ie3 o interest! notice t$e position o t$e

/> relatie to t$e pupil- I t$e camera is ie3ing t$e eye rom belo3 t$e line o gaFe! t$e /> 3ill be belo3 t$e center o t$e pupil- 4Dote t$at t$e /> need notbe entirely belo3 t$e pupil! =ust belo3 t$e center o t$e pupil- I t$e camera is ie3ing t$e /> rom aboe t$e line o gaFe! t$e /> 3ill appear to be aboe t$ecenter o t$e pupil- It is best or t$e camera to look at t$e eye rom belo3 t$ecentral line o gaFe because t$is makes it less likely t$at t$e upper eye lid 3illobscure t$e eye image 3$en t$e sub=ect looks do3n- To ad=ust t$e camera

ertical ie3 angle! reer to@gures 5)#! 5)*! and 5)5-

2igure 5)(*- Met$ods or lo3ering

8/19/2019 ASL 501 Manual

54/91


;ne met$od or making t$e camera look at t$e eye rom a 8lo3er9 position is to@rst rotate t$e optics module so t$at t$e aperture points more to3ards t$esub=estHs ace- Dote t$at t$is 3ill cause t$e pupil image to moe to3ards t$etop o t$e eye monitor- Dext! rotate t$e isor to recenter t$e pupil image- T$isis s$o3n as 8met$od)19 in @gure 5)# and in @gure 5)5- I t$e camera optical

pat$ needs to be lo3ered still urt$er! moe t$e isor art$er a3ay rom t$eoptics module as s$o3n in @gure 5)# 48met$od)( and 5)*- T$is can be done byextending t$e telescoping isor arms on t$e large isor! or by sliding t$emonocular isor boom in its mounting bracket 4see @gure ()1" and! i necessary! bending t$e boom 3ire- T$is 3ill again cause t$e pupil image tomoe up and it 3ill be necessary rotate t$e isor to recenter t$e image-

I t$e /> is too ar belo3 t$e pupile disappears under t$e lo3er eyelid 3$ent$e sub=ect looks up! t$en raise t$e eye camera angle by ollo3ing t$e aboeprocedures in reerse-

2or maximum $oriFontal range! t$e /> s$ould be near t$e $oriFontal center o t$e pupil 3$en t$e sub=ect is looking 8straig$t a$ead9 4at t$e center o t$e isual @eld o most interest to t$e experimenter- T$e large isor does notpermit muc$ lateral ad=ustment! but t$e monocular isor does $ae t$is degreeo reedom- I t$e /> is 3ay o to t$e let o t$e eye monitor 43$en t$e sub=ectlooks 8straig$t a$ead9! slide t$e optics module a bit to t$e sub=ectHs let! andtilt t$e isor 4bend t$e boom 3ire or rotate t$e boom slig$tly in its mounting

bracket to re)center t$e eye image- I t$e /> is 3ay o to t$e rig$t on t$e eyemonitor! slide t$e optics module to t$e sub=ectHs rig$t and tilt t$e isor to re)

center t$e image-

By increasing or decreasing t$e angle o t$e isor! and by rotating t$e opticsmodule as described aboe! t$e eye tracker 3ill ie3 t$e eye rom a ertically$ig$er or lo3er angle so as to obtain t$e optimal ie3 or a particular eye line)o)gaFe region- 2or example! reading studies generally reJuire t$e optics bebiased so as to allo3 proper monitoring o a lo3 @eld o ie3 3$ereas driing

2igure 5)(:- Met$od)( orad=usting eye camera pat$angle 3it$ type)( moduleand monocular isor

2igure 5)(5- Met$od) 1 orad=usting eye camera pat$angle 3it$ type)( moduleand monocular isor

26

8/19/2019 ASL 501 Manual

55/91


or piloting studies generally emp$asiFe a more or3ard @eld o ie3- I t$e isor and optics module $ae been placed properly! t$e corneal reKection 4/>3ill be =ust belo3 t$e center o t$e pupil 3$en t$e sub=ect looks at t$e centero t$e desired @eld o ie3- I t$e /> is aboe t$e center o t$e pupil 3$en t$esub=ect is looking at t$e center o t$e @eld o ie3! use t$e met$ods described

aboe to lo3er t$e

8/19/2019 ASL 501 Manual

56/91


delay bet3een detection o an edge point and display o t$e corresponding doton t$e monitor! and makes t$e discrimination outlines easier to see- It is t$etrue eature edge coordinates t$at are being detected-

To ac$iee proper pupil and /> discrimination! proceed as ollo3s-

1& Start 3it$ pupil and /> discriminator slide s3itc$es all t$e 3ay to t$elet

& Begin to increase t$e pupil discriminator leel by moing t$e slide s3itc$to t$e rig$t- $ite dots 3ill begin to appear on t$e eye monitor- T$eseare discrimination points indicating ideo leels 3$ic$ are $ig$ enoug$to trigger t$e pupil edge t$res$old- As t$e discriminator is turned upurt$er! t$ese 3$ite dots begin to orm an outline 3it$in t$e pupil and3$en t$e discriminator is turned up ar enoug$! t$e dots 3ill orm a linet$at circumscribes t$e pupil- At t$is point 3$ite recognition cross $airss$ould appear t$roug$ t$e center o pupil- 4T$e circle and cross $airs

3ill actually be oset slig$tly to t$e rig$t o t$e pupil as s$o3n in @gure

5):-& Moe t$e discriminator to t$e rig$t =ust ar enoug$ so t$at a solid 3$ite

circle orms about t$e pupil and 3$ite cross $airs designate t$e center o pupil- 4?upil diameter c$anges oer time and as a unction o 3$ere t$esub=ect looks- ;bsere t$e eye monitor or seeral seconds as t$esub=ect looks around to be sure t$at recognition is maintained een 3$ent$e pupil is at its smallest- T$ere may be ot$er areas in ie3 3$ic$ $ae

2igure 5)(7- ?roper ?upil and /> discrimination

(-

8/19/2019 ASL 501 Manual

57/91


3$ite discriminator dots! but t$e pupil s$ould be t$e only smoot$lyenclosed area and s$ould $ae 3$ite recognition cross $airs designatingits center- I t$e pupil is ery dim and diicult to distinguis$ romsurrounding eatures! Moe t$e Illumination slide s3itc$ to t$e rig$t toincrease illumination intensity- T$is 3ill probably not be necessary

unless ambient illumination or t$e scene display is especially brig$t- I illumination intensity is increased be sure not to make t$e pupil as brig$tas t$e corneal reKection 4/>- It is important t$at t$e /> remain isible3it$in t$e pupil image-

2& I t$e pupil discriminator is too ar to t$e rig$t! ot$er areas may bemistakenly recogniFed as t$e pupil and t$e recognition cross $airs may =ump to t$ese areas- S$ould t$is $appen! lo3er t$e pupil discriminatorsetting by moing t$e slide s3itc$ let I t$e 3$ite circle does notremain solid! increase t$e discriminator leel 4moe t$e slide rig$t! eeni t$is means a e3 3$ite dots appear in ot$er areas- /ATI;D% i t$epupil discriminator is muc$ too ar to t$e rig$t! t$e cross $airs and all

t$e 3$ite dots may disappear 4an edge may be detected about t$e entiremonitor screen! and all t$e 3$ite dots 3ill be $idden be$ind t$e monitorbeFel- Small ad=ustments o t$e discriminator are probably best madeby clicking t$e rig$t or let arro3 buttons at eit$er side o t$e slide- T$isallo3s @ner control t$an dragging t$e slider-

5& it$ t$e sub=ect looking straig$t a$ead! moe t$e /> slide s3itc$ rig$tuntil a black outline orms about t$e /> and black recognition cross$airs designate t$e center o t$e /> 4t$e circle and cross $airs 3illactually be oset slig$tly to t$e rig$t as s$o3n in @gure 5):- /ATI;D%I t$e /> discriminator is too ar to t$e rig$t! t$e pupil recognition cross

$airs as 3ell as t$e /> recognition cross $airs may disappear-& Be sure t$at t$e /> is properly recogniFed as t$e sub=ect looks about t$e

@eld o ie3 o interest- I t$e black dots orm about more t$an onegeometrically satisactory 6corneal reKection!6 t$e computer sot3are3ill select t$e one closest to t$e pupil or recognition-

5&& #cene Ca-e,a

3i!e't S'ene 4a,e!a

I using a direct scene camera! as pictured in @gure ()&! rotate t$e camerausing t$e ball =oint mount to aim at t$e desired @eld o ie3- Ask t$e sub=ect to

look to3ards a target t$at is at t$e center o t$e @eld o ie3 o interest! or ask t$e sub=ect to stretc$ out one arm and $old a @nger at 3$at eels like t$ecenter o t$eir @eld o ie3- >otate t$e scene camera so t$at t$is target 4or t$esub=ectHs @nger appears at t$e center o t$e scene monitor! and so t$at t$escene image appears uprig$t 4not tilted- Scene camera ocus can be ad=ustedby turning t$e scene camera lens barrel-

1

8/19/2019 ASL 501 Manual

58/91


5a!alla% 1!ee 6Indi!e't7 S'ene 4a,e!a

I using a boom mounted scene camera to minimiFe parallax! t$e scene camera6looks6 at t$e reKection rom t$e outer isor surace 4see @gure ()5- Ideally! itis located directly underneat$ t$e isor looking straig$t up into t$e ie3ingaperture o t$e optics module- T$e acial eatures o a sub=ect or a particular

scene reJuirement! $o3eer! mig$t necessitate a deiation rom t$is position-

?ositioning o t$e scene camera is accomplis$ed by moing t$e camera toapproximately t$e proper position and t$en @ne tuning its orientation 3$ileobsering t$e image on t$e scene monitor- It is best to make grossad=ustments by exerting pressure directly on t$e =oints o t$e scene cameraboom- Manipulate a =oint by $olding 3it$ one $and on eit$er side o t$e =ointbeing moed- 2ine ad=ustments may t$en be done by moing t$e camera onlyin t$e # degrees o rotational reedom- Try not to extend or bend t$e boom byapplying orce on t$e camera case alone-

$en t$e scene camera is properly positioned! t$e scene monitor s$ould s$o3t$e @eld o ie3 t$at is o primary interest- Scene camera ocus can bead=usted by turning t$e scene camera lens barrel-

2or best results! begin scene camera ad=ustment by placing t$e scene cameralens ery near t$e bottom edge o t$e isor! and under t$e sub=ects eye

asl 501 manual

Documents