Eye Tracking Technology - Cerebral Palsy Alliance

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TECHNOTALKVOLUME 20 - ISSUE 1 - APRIL 2011IntelliGaze IG-30 EyeGaze Edge TM4 Eye Tracker(Quick Glance 4)System Specifications/Hardware (cont.)Battery/BatteryLifeTracking module ispowered by device orcomputer system.Up to 8 hours use on thePowerBox 7SpeakersDepends on system. ThePowerBox 7 comes withhigh quality amplifiedspeakers.Access and CalibrationCamera/TrackingmethodTrack 1 or 2 eyes(binocular)Visual feedback ofeye imageOptimal workingposition of systemHybrid infrared video eyeandhead-trackingLeft or right individually,or both together orwhichever the systemrecognises as the “besteye”.Live image available viakeyboard shortcut. Nolive image available whenusing The Grid 2.600 mm distance)300 x 200 x 200 mm(WxHxD) working fieldSubjectively, it was feltthat there was a limitedrange of accuracy if thehead was moved fromfront to back.Up to 2 hoursDepends on system.Tracking module ispowered by computersystem.EyeProDepends on system.Tracking module ispowered by computersystem.Advertising material claimsthat this device is a “Newtechnology low voltageUSB camera”.Inbuilt in the tablet Depends on system Depends on systemPupil centre/cornealreflection method. Alower power infrared LEDemits light and illuminatesthe eye. An infraredsensitive video cameraprocesses the image andthe Edge calculates theperson’s gaze point.Left or right individually orboth together.An eye image displayappears in the top rightcorner of the controlscreen. This displayincludes a focus indicatorand red/green colour alertto indicate where the usershould move to restoregood focus. The imagedisplay can be toggled onand off using F12.26” (65cm) is reportedby the developers. Usersshould sit in front ofscreen with the top ofthe screen at eye level.Also reported that userswith uncontrolled headmovement may not findthe system suitable ascamera has limited fieldof view.Video, dark pupil, infraredillumination.Can track one eyeindividually (left or right)OR left and/or right to setsystem to track either eyesimultaneously OR left andright to set system to onlytrack when it has botheyes in image.Has live video imageof eyes or eye positionindicators.For distance can select:- 50-60cm- 60-70cm- OtherOptimal height of unit iswhen eyes are in centre ofimage.250 x 160 x 190 mm(WxHxD) working fieldVideo, dark pupil, infraredillumination.One eye individually (leftor right) OR both left and/or right, (the system willtrack whichever eye it hasthe best tracking of) ORleft and right to set systemto only track when it hasboth eyes in image.Has live video imageof eyes or eye positionindicators. Both can bechosen and turned onand off.The distance of the eyesfrom the camera can bespecified in a broad rangethat can be set by theuser. (25cm and 90cmhave both been tested.)250 x 160 x 190 mmWxHxD working field.CEREBRALPALSY.ORG.AU12
TECHNOTALKVOLUME 20 - ISSUE 1 - APRIL 2011IntelliGaze IG-30 EyeGaze Edge TM4 Eye Tracker(Quick Glance 4)Access and Calibration (cont.)Selection methods • Blink• Dwell• Blink• Dwell• DwellAdditional accessoptionsCalibrationAbility to turn eyetracking on/offindependently• Switch access isdependent on thedevice. The PowerBox7 with The Grid 2 iscapable of switch access.• Switch access isdependent on device.There are no switchports included on thetablet that can bebundled with the TM4,but a switch adaptedmouse can be used toenable switch selectionwhen used with eyepointing.EyePro• Blink• Dwell• Switch access isdependent on deviceDepends on system. Depends on system. Depends on system. Depends on system.Calibration can becompleted in The Grid2 or in the IntelliGazesoftware. Different optionsare available for each.Using the IntelliGazesoftware, there are 1, 5,9 or 16 points. The imagesize, image and speed canalso be customised. Theuser can independentlyinitiate calibration byfixing their eyes on thecamera for 10 seconds.(Alt+F5 key press requiredalternatively). A carer orsupport person can set upthe number of calibrationpoints.The Grid 2 allows selectionof 1, 5, 9, or 16 calibrationtargets and allows adifferent target image tobe displayed as well as aslow calibration, but thesize of the target cannotbe adjusted.Some staff from TASCfound it difficult to achievea good calibration scorein The Grid 2 when usingthe IntelliGaze, whichsignificantly impactedaccuracy. ##Pause function can beset up in The Grid 2, buta specific cell must bededicated to this. Theuser can access pause inWindows if the IntelliGazesoftware is running.The user cannot easilychange access methodsindependently.The software allowsadjustment between 5, 9OR 13 target calibration.The background ofthe calibration can beset to white or blackand the target dots areautomatically adjustedin size depending on thenumber of calibrationtargets (maximum targetsize 1cm). Target image isalways a yellow dot andcannot be adjusted. Noinformation available onwhether the speed can beadjusted.Information unavailableThe software displays 5,9 or 16 targets on thescreen. Using more targetsincreases calibrationaccuracy. The time thateach calibration target isdisplayed can be adjustedbut not the type or size oftargets.Yes – Off screen buttoncan be made availableDepends which softwareis being accessed. Usingthe Words+ software(default) the user canindependently access thecalibration settings. Canbe set up with 5, 9 or 16point calibration and thecalibration target time canbe adjusted, but not thecalibration image or size.See IntelliGaze IG-30 forinformation on settings forThe Grid 2.Yes – Off screen buttoncan be made availableCEREBRALPALSY.ORG.AU13
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