Wheelchair Motion

Control Using Eye

Gaze & Blinks

CONTENTS:

Main Objective Introduction Literature Review Proposed method Block diagram Circuit diagram References

MAIN OBJECTIVE:

The world population is increasing faster

and also the people with disabilities

(PWD) ratio increasing.

They face barriers at their each turn and

they need some helpers in their daily

works. The assistive device acts as a

boon for them.

Introduction:

The most widespread assistive device is the

wheelchair.

The project wheelchair motion control using eye

gaze and blinks will be very useful for physically

challenged persons.

In this project we are going to design a

wheelchair motion control based on one of the

eye tracking methods that is EOG signals.

LITERATURE REVIEW:

Eye tracking methods: Video Oculography (VOG) Infrared Video System (IRVS) Infrared Oculography (IROG) Search Coil (SC) Optical-type Eye Tracking System Purkinje dual-Purkinje-image (DPI) Electro - Oculography (EOG)

Proposed method:

In this project we are dealing with Electro - oculograph (EOG) technique for eye tracking.

The Electro - oculography (EOG) is a method for sensing eye movement and is based on recording the standing corneal-retinal potential arising from hyper polarizations and depolarizations existing between the cornea and the retina; this is commonly known as an electro- oculogram (EOG).

BLOCK DIAGRAM:

SIGNAL ACQUISITION:

Skin Preparation:

The potentials existing at the skin surface can result in a

large dc potentials.

Any disturbance of the skin by motion, touching, or

deformation can cause this potential to change and result in

motion artifacts.

Sweat glands in the epidermis can also contribute varying

extents of skin resistance and skin potential.

Such potentials and artifacts can be reduced by abrading

the epidermal skin.

Biopotential electrodes:

The most critical point in the measurement of biopotential is the

contact between electrodes and biological tissue.

Both the electrode offset potential and the electrode/tissue

impedance are subject to changes due to relative movements

of electrode and tissue.

Thus, two interference signals are generated as motion

artifacts: the changes of the electrode potential and motion-

induced changes of the voltage drop caused by the input

current of the preamplifier.

PLACEMENT OF ELECTRODES FOR EOG RECORDING:

Fig.(A) Eye-movement detection with gaze angles (horizontal EOG) (B)Eye-movement and blinking detection (vertical EOG)

Signal preprocessing stage:

Signal processing algorithm

Controller Block Diagram:

PROPOSED CIRCUIT DIAGRAM:

REFERENCES:

Hari Singh, Dr. Jaswinder Singh; Human Eye Tracking and Related Issues: A Review, International Journal of Scientic and Research Publications, Volume 2, Issue 9, September 2012

Al-Haddad, A.; Sudirman, R.; Omar, C.; Koo Yin Hui; Jimin, M.R.; Wheelchair Motion Control Guide Using Eye Gaze and Blinks Based on Point Bug Algorithm, Intelligent Systems, Modelling and Simulation (ISMS), 2012 Third International Conference on , vol., no., pp.37-42, 8-10 Feb. 2012

D. P. Belov, S. Y. E., S. F. Kolodyazhnyi, I. E. Kanunikov, and O. V. Getmanenko "Electrooculogram Detection of Eye Movements on Gaze Displacement. Journal of Neuroscience and Behavioral Physiology, Springer New York, Vol. 40, pp. 583-591, 2010.

THANK

YOU