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EYE-GAZE

HUMAN COMPUTER INTERFACE

Presented byP.Sabitha

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INTRODUCTIONINTRODUCTION

The EYEGAZE System provides an eye-controlledhuman computer interface, allowing people to interactwith computers by pointing with their eyes.

First EYEGAZE System in 1988(LC Technologies)

Early applications of the eye-gaze system addressed anHCI for people with severe motor disabilities.

Simply, by looking at control keys displayed on acomputer screen a disabled user can type , generatesynthesized speech, play games and run DOS compatibleoff-the-shelf software.

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EYEEYE--TRACKINGTRACKING Eye tracking is the process of measuring either the

point of gaze ("where we are looking") or the motionof an eye relative to the head.

EYE TRACKERS TYPE

CONTACT-LENS

NON-CONTACT LENS

CONTACT ELECTRODES

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EYEGAZEEYEGAZE

SYSTEM CONFIGURATIONSYSTEM CONFIGURATION

Its an video camera located belowthe computer screen continually

observes the users eye.A special image processing softwaredetermines the eye oreintation and

projects the subject gazepoint oncomputer.

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METHODFOREYEGAZEMETHODFOREYEGAZE

The Eye-gaze system uses the pupilcenter/corneal-

reflection method to determine the eyes gaze direction.

The computer calculates the persons gaze point, i.e theco ordinates of where on the display he is looking basedon relative position of the person and eye reflection.

To calibrate, the user fixes his gaze on a sequence ofsmall circles that the computer displays at specificlocations on the screen.

Fig: 2. LED-illuminated eye image showing

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EYEGAZEEYEGAZE

SYSTEM WORKINGSYSTEM WORKING

EYEGAZE SELECTION METHOD. The user calls up the program he wants by fixing his

gaze in a box or key next to name the program. Here after finished with a program it gives the exit

key and go to main menu

Fig: 3. Main Menu screen

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WORKINGOF MAINMENUWORKINGOF MAINMENUWITH PROGRAMWITH PROGRAM

The user operates the Eyegaze edge by looking at rectangularkeys that are displayed on the control screen.

To press a eye-gaze key the user looks at the key for aspecified period of time.

An array of menu keys and exit keys allow the user tonavigate the eyegaze progam independently.

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FEATURES OFTHE SYSTEMFEATURES OFTHE SYSTEM

Calibration

Fully automaticoperation

Consistencychecking

Accuracy

Accommodating head range variation Accommodatingpupildiameter variation

Accommodatingglintstraddlingpupil edge

Remote Video Tracking

Unobtrusive with nothing attachedtothe user

Reliability Robust eye recognition

Accommodating human eye variations

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EYEGAZE APPLICATIONSEYEGAZE APPLICATIONS

PROGRAMSPROGRAMS TYPEWRITER PROGRAM

Simple word processing can be done using the Typewriter program.

The retrived text may be verbalized,edited or printed.

Fig:6. Typewriter program

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THE LIGHTS ANDTHE LIGHTS AND

APPLIANCES PROGRAMAPPLIANCES PROGRAM

There are a vareity of eye control application available for andisabiled users.

The typed text can be printed or spoken by the speechsynthesizer.

Telephone program permits phone dailing and answering with

the eyes.

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RUN SECOND PCRUN SECOND PC

RUN SECOND PC

Fig: 8.1.Frequency KeyboardFig: 8.1.Frequency Keyboard Fig: 8.2.Mouse Control ScreenFig: 8.2.Mouse Control Screen

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FUTURE DIRECTIONSFUTURE DIRECTIONS

For people with uncontrolled head motion, it needs to

be tolerant to head motion. The accuracy and

calibration objectives have been achieved. A solution

for accommodating head motion is under

development

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HUMANCOMPUTERHUMANCOMPUTERINTERACTIONISSUESINTERACTIONISSUES

Several sources of feed back by incorporated into theSeveral sources of feed back by incorporated into theeyeeye--gaze software to help by user in his visualgaze software to help by user in his visualinteraction with the computer.interaction with the computer.

The cursor identifies the computers gaze pointThe cursor identifies the computers gaze point

prediction and moves around the screen as a userprediction and moves around the screen as a usermoves his eyes.moves his eyes.

A key press delay can be added to give users withA key press delay can be added to give users withslowed eye movements additional time to move thereslowed eye movements additional time to move there

gaze of a key with out repeatedly activating it.gaze of a key with out repeatedly activating it.

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CONCLUSIONCONCLUSIONAlthough there are many softwares existing, all of

them cannot be accessed by persons with some

disabilities. In such cases, this technology assists

these softwares so that any person with disabilities

can use them.

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THANK YOU