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International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 666
EOG BASED HUMAN MACHINE INTERFACE TO CONTROL ELECTRIC
DEVICES USING EYE MOVEMENT
Mr. Shivaprasad B K1, Mr. Vishwanath Muddi2
1,2Assistant Professor, Department of Electronics and Communication Engineering, PESITM, Shivamogga,
VTU, Belagavi.
---------------------------------------------------------------------------***---------------------------------------------------------------------------
Abstract:- Rehabilitation devices are increasingly being used to improve the quality of the life of differentially abled people.
Human Machine Interface (HMI) have been studied extensively to control electromechanical rehabilitation aids using
biosignals such as EEG, EOG and EMG etc. among the various biosignals, EOG signals have been studied in depth due to the
occurrence of a definite signal pattern. Persons suffering from extremely limited peripheral mobility like paraplegia or
quadriplegia usually have the ability to coordinate eye movements. The current project focuses on the development of a
prototype motor wheelchair controlled by EOG signals. EOG signals were used to generate control signals for the movement of
the wheelchair. As a part of this work an EOG signal acquisition system was developed. The acquired EOG signal was then
processed to generate various control signals depending upon the amplitude and duration of signal components. These control
signals were then used to control the movements of the prototype motorized wheelchair model.
Keywords - Electrooculography (EOG), Eye movements, Rehabilitation aids, BCI, HCI.
I. INTRODUCTION
Bio-based HCI (Human Computer Interface) has the potential to enable severely disabled people to drive computers directly
by bio-electricity rather than by physical means. A study on the group of persons with severe disabilities shows that many of
them have the ability to control their eye movements, which could be used to develop new human computer interface systems
to help them to communicate with other persons or control some electrical instruments. With improvement in technology,
there is a vast development in the field of rehabilitation techniques. Research is going on to develop reliable, low cost and easy
to use devices. Out of all the rehabilitation techniques, HCI (Human Computer Interface) and HMI (Human Machine Interface)
are the latest and most effective techniques. Researches in these fields are being carried out extensively. The main objective of
the HMI system is conversion of signals generated by humans through various gestures to control some electromechanical
devices. While in HCI system some key strokes or cursor movements on the screen are controlled by using these signals. In HCI
and HMI both biosignals and non biosignals are used as a medium of control. The chief biosignals used in the Interface are
Electromyography (EMG), Electroencephalography (EEG) and Electrooculography (EOG). HMI is commonly used by motor
impaired patients to control wheelchair.
Rehabilitation devices are broadly classified into two categories; the first category includes all those devices which are
biosignal and the second category includes non biosignal based devices. Non biosignal rehabilitation aids provide 100%
accuracy and require less training for patients but the usage of these devices is limited to patients with partial or complete
flexibility in their body parts. Biosignal based rehabilitation devices mainly use biosignals like EEG, EOG or EMG as control
signals. The advantage of using biosignal approach is that when patients become completely paralyzed, the only resource
available to them then is biosignals. However it usually needs user training and has lesser accuracy than non biosignal
approaches. The biosignal approach usually requires user calibrations because biosignals produced by each individual are
unique due to difference in individual physiological properties and skin conductance.
II. LITERATURE REVIEW
Satish Kumar et.al, 2015 have proposed a low-cost Electrooculogram (EOG) acquisition system that can be used efficiently in
Human Machine Interface (HMI) systems. The proposed system consists of an Op-Amp based EEG/EOG amplifier circuit and
ATMega8 microcontroller for analog to digital conversion and transferring of acquired data to PC. In this system five
electrodes are used to acquire eye blinking, horizontal and vertical eye movements. In this system, the signals are first
captured using EEG surface electrodes, amplified, filtered and then converted into digital form before stored into PC. The
acquired EOG signal provides different eye related activities. Depending upon these eye related activities various systems can
be developed to perform different tasks in real world, which provides a degree of independence to the user [1].
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 667
Kousik Srathy Sridharan, 2012 in his thesis work has built a portable system to acquire and analyse electro-oculographic
(EOG) signals in real-time. The system contains two sub-systems; a hardware sub-system that consists of the filters, amplifiers,
data acquisition card and isolation and the software sub-system that contains the program to acquire and analyse the signal
and present the results to the observer .In his work, one paradigm records only normal blinks while the other records long
blinks and the results showed differences in detection and error rates. The observations made from performance tests at
various levels gave satisfactory results and proved the usefulness of the system for sleep state and drowsiness detection [2].
A Saravananet, 2015 have designed a system which incorporates Texas embedded processor, wireless communication
solutions and highly-customized analog front ends. As a demonstration of concept, this technology uses instrumentation
amplifiers as analog front end and further single supply quad op-amp for analog signal processing in an effective manner [3].
W S Wijesoma et.al, 2005.In this paper a complete system is presented that can be used by people with extremely limited
peripheral mobility but having the ability for eye motor coordination. The Electrooculogram signals (EOG) that results from
the eye displacement in the orbit of the subject are processed in real time to interpret the information and hence generate
appropriate control signals to the assistive device. The effectiveness of the proposed methodology and the algorithms are
demonstrated using a mobile robot for a limited vocabulary [4].
Ali Marjaninejad, Sabalan Daneshvar, 2014. In this paper an EOG based low-cost real-time wheelchair navigation system
for severely disabled people is present d using signal processing techniques, bio-amplifiers and a microcontroller driven
servomotor. All the digital signal processing and execution of commands were performed utilizing a microcontroller which
drastically reduced the total cost of this project. The servomotor has been synchronized with the computed eye direction
resulted from processing the horizontal EOG signal. The speed of the wheelchair was also regulated with the same EOG signal.
Performed tests indicated that in 98.5% of trials, subjects could navigate to their targets in presence of simple obstacles in
their first attempts which confirm the feasibility of the proposed system [5].
III. SYSTEM DEVELOPMENT
The eye is known to have a resting potential and acts as a dipole in which the anterior pole (cornea) is positive and the
posterior pole (retina) is negative as shown in the figure 1.1.The magnitude of this cornea-retinal potential is in the range 0.4-
1.0 mV. This difference in potential can be explained by the metabolic activities in the eye. The Electrooculogram (EOG) signal
thus is derived from the polarization potential, also known as the Corneal-Retinal Potential (CRP), generated within the
eyeball by the metabolically active retinal epithelium. The CRP is produced by means of hyper-polarizations and de-
polarizations of the nervous cells in the retina .Electrooculography (EOG) is a technique for measuring this resting potential.
The resulting signal is called the Electrooculogram.
Fig. 1: Polarity of Eye
Fig.2: EOG signal based on eyeball movement
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 668
The amplitude of the EOG signal is known to be in microvolt range (15 - 200 uV) and most of the information is contained in 0
Hz to 38 Hz frequency range with dominant component in 0 to 25 Hz range. Specially designed electrodes for EOG are placed
on the corners (lateral canthi) of both the eyes. When the eyes look left the positive end of the dipole (the eye) comes closer to
the electrode on the left canthus and the negative end to the right canthus. The vice versa is observed for the eyes looking
towards right. Ideally the difference in potential should be proportional to the sine of the angle the eye produces with respect
to the central axis.
Fig. 3: EOG Block Diagram of the System
A. Method used for EOG based assistive technique
Basic Block Diagram of EOG based HMI system is given in Fig 4.
Fig. 4: Basic Block Diagram of EOG based HMI system
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 669
The development work involved three parts:
1. Signal acquisition part included development of DAQ.
2. Signal classification part included classification of basic eye movement types and blink.
3. Application part involved implementation of rehabilitation devices which can be controlled using EOG.
Fig. 5: Electrooculography electrode placements
EOG signals were measured by placing electrodes on the region surrounding the eye. They were recorded from two separate
regions: horizontal and vertical. Horizontal electrodeswere for detecting horizontal eye movements (left and right eye
movement) and vertical electrodes were for detecting vertical movements (up and down cornea movements).
B. Flowchart
1) Flowchart for blink detection
Fig. 6: Flowchart for blink detection
2) Flowchart for detecting right-left eye movement
An EOG signal corresponding to right-left eye movement was dominated in horizontal channel. Hence for easy analysis, right-
left classification algorithm was applied to EOG signals form horizontal channel. Algorithms were carried out simultaneously
and in parallel.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 670
Right and left eye movement we experienced almost the same amplitude and the amplitude of EOG signal was around 290µv.
But there was a slight difference in the voltage during movement of eye from right to left.
Fig. 7: Flowchart for detecting right-left eye movement
IV. RESULTS
In the present work, an EOG signal acquisition system has been designed and implemented. Additionally, a new algorithm for
EOG classification and control signal generation was also developed. This algorithm required much less user training than
other classification algorithms. Hence it is very much useful for the implementation of rehabilitation aids. As a part of this
project, an EOG based Human Machine Interface has been developed. This HMI was able to generate control signals during
various eye movements and blinks. The following figures below indicate the system results in for different eye movements.
A. 5.1 Eye movement detection
Fig. 8: Left eye movement was detected and device-1 is turned ON
The Fig. 8 shows movement of left eye and EOG electrode placement Vertical EOG signals and horizontal EOG signals were
processed in parallel.Signal amplitudes were compared with the corresponding threshold values. Once it crossed the
threshold, the duration for which it holds the threshold value was calculated. If both duration and amplitude condition were
satisfied, it generated one control signal. Control signal was generated in such a way that it remained high for the next 2
seconds. Even though the input signal changed, its values did not vary during this time. This kept the system in minimum error
and maximum control. The generated command signals were used to turn on the electric bulb and it is shown in Fig. 8.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 671
B. Eye Blink sensor output
In blink detection, the comparator was used to detect blinking action. If amplitude of the signal was above threshold and pulse
duration was within the range, it detected as blinking and device-2 is controlled .
Fig. 9:Eye blink was detected and decive-2 is turned ON
V. Conclusions
In the present work, an EOG signal acquisition system has been designed and implemented. Additionally, a new algorithm for
EOG classification and control signal generation was also developed. This algorithm required much less user training than
other classification algorithms. Hence it is very much useful for the implementation of rehabilitation aids. As a part of this
project, an EOG based Human Machine Interface has also been developed. This HMI was able to generate control signals during
various eye movements and blinks. These control signals were used to control electric device model by various eye
movements and blink. This EOG based HMI control system for electric device will be a good assistive technique for people
suffering from extremely limited peripheral mobility. From the application point of view, control signals generated can be used
to control HCI systems or other communication devices. As a whole, great prospects lie ahead for the current project which
can be implemented with some further modifications.
REFERENCES
[1] Andreas bulling, Jamie A. ward, Hans gellersen, Gerthar troster, “Eye movement analysis for activity recognition using
electrooculgraphy” IEEE transactions on pattern analysis and machine intelligence, vol 33, NO. 4, April 2011. 1323
International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 5, May – 2013
[2] David Raamirez Perez, “Human Machine Interface Communication using EOG for handicapped people”, Congress on
Instruments and Applied Sciences.
[3] Siriwadee Aungsakun, Angkoon Phinyomark, Pornchai Phukpattaranont and Chusak Limsakul, “Development of robust
electrooculgraphy (EOG) - based human-computer interface controlled by eight-directional eye movements”, International
Journal of Physical Sciences, vol 7(14), pp. 2196- 2208.
[4] Nolan Y M, “Control and communication for physically disabled people, based on vestigial signals from the body”, PhD
thesis paper submitted to National University of Ireland, Dublin, 2005, pp. 7-18.
[5] Malik Q A and Ahmad J, “Retina Based Mouse Control (RBMC)”, World Academy of Science, Engineering and Technology,
(7); (2007) pp. 318-321.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 672
[6] Ahsan M R, Ibrahimy M I and Khalifa , “EMG Signal Classification for Human Computer Interaction: A Review”, European
Journal of Scientific Research, 33 (3); (2009), pp. 480-501.
[7] Lotte N S and Struijk A, “An Inductive Tongue Computer Interface for Control of Computers and Assistive Devices”, IEEE
Transactions on Biomedical Engineering, 53(12); (2006), pp. 2594-2597.
[8] Gopi E S, Sylvester R, Rangarajan V and Nataraj L, “Brain Computer Interface Analysis using Wavelet Transforms and Auto
Regressive Coefficients”, International Conference on Electrical and Computer Engineering (ICECE’06), Dhaka, Bangladesh,
(2006), pp.169 – 172.
[9] Wolpaw J R, Birbaumer N, Mcfarland D J, Pfurtscheller G and Vaughan T M, “Brain Computer Interfaces for communication
and control”, Clinical Neurophysiology, 113 (6); (2002), pp. 767–791.
[10] Barcia J C, “Human Electrography Interface”, Master in Physics Engineering thesis submitted to Lisbon Technical
University, (2010), pp. 03-09.
[11]Guyton A C and Hall J E, “Textbook of medical physiology”, International edition, 11th edition. Elsevier Saunders, (2006),
pp. 626-639.
[12] Merino M, Rivera O, Gomez I, Molina A and Dorronzoro E, “A Method of EOG Signal Processing to Detect the Direction of
Eye Movements”, Proceedings of the 2010 First International Conference on Sensor Device Technologies and Applications,
Venice, Italy, (2010), pp.100-105.
[13] Usakli A B, Gurkan S, Aloise F, Vecchiato and Babiloni F, “On the Use of Electrooculogram for Efficient Human Computer
Interfaces”, Computational Intelligence and Neuroscience, 2010; (2010), pp. 1-5.
[14] D’Mello P C and D’Souza S, “Design and development of a Virtual Instrument for Biosignal Acquisition and Processing
using LabVIEW”, International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 1(1);
(2012), pp. 1-5.

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IRJET- EOG based Human Machine Interface to Control Electric Devices using Eye Movement

  • 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 666 EOG BASED HUMAN MACHINE INTERFACE TO CONTROL ELECTRIC DEVICES USING EYE MOVEMENT Mr. Shivaprasad B K1, Mr. Vishwanath Muddi2 1,2Assistant Professor, Department of Electronics and Communication Engineering, PESITM, Shivamogga, VTU, Belagavi. ---------------------------------------------------------------------------***--------------------------------------------------------------------------- Abstract:- Rehabilitation devices are increasingly being used to improve the quality of the life of differentially abled people. Human Machine Interface (HMI) have been studied extensively to control electromechanical rehabilitation aids using biosignals such as EEG, EOG and EMG etc. among the various biosignals, EOG signals have been studied in depth due to the occurrence of a definite signal pattern. Persons suffering from extremely limited peripheral mobility like paraplegia or quadriplegia usually have the ability to coordinate eye movements. The current project focuses on the development of a prototype motor wheelchair controlled by EOG signals. EOG signals were used to generate control signals for the movement of the wheelchair. As a part of this work an EOG signal acquisition system was developed. The acquired EOG signal was then processed to generate various control signals depending upon the amplitude and duration of signal components. These control signals were then used to control the movements of the prototype motorized wheelchair model. Keywords - Electrooculography (EOG), Eye movements, Rehabilitation aids, BCI, HCI. I. INTRODUCTION Bio-based HCI (Human Computer Interface) has the potential to enable severely disabled people to drive computers directly by bio-electricity rather than by physical means. A study on the group of persons with severe disabilities shows that many of them have the ability to control their eye movements, which could be used to develop new human computer interface systems to help them to communicate with other persons or control some electrical instruments. With improvement in technology, there is a vast development in the field of rehabilitation techniques. Research is going on to develop reliable, low cost and easy to use devices. Out of all the rehabilitation techniques, HCI (Human Computer Interface) and HMI (Human Machine Interface) are the latest and most effective techniques. Researches in these fields are being carried out extensively. The main objective of the HMI system is conversion of signals generated by humans through various gestures to control some electromechanical devices. While in HCI system some key strokes or cursor movements on the screen are controlled by using these signals. In HCI and HMI both biosignals and non biosignals are used as a medium of control. The chief biosignals used in the Interface are Electromyography (EMG), Electroencephalography (EEG) and Electrooculography (EOG). HMI is commonly used by motor impaired patients to control wheelchair. Rehabilitation devices are broadly classified into two categories; the first category includes all those devices which are biosignal and the second category includes non biosignal based devices. Non biosignal rehabilitation aids provide 100% accuracy and require less training for patients but the usage of these devices is limited to patients with partial or complete flexibility in their body parts. Biosignal based rehabilitation devices mainly use biosignals like EEG, EOG or EMG as control signals. The advantage of using biosignal approach is that when patients become completely paralyzed, the only resource available to them then is biosignals. However it usually needs user training and has lesser accuracy than non biosignal approaches. The biosignal approach usually requires user calibrations because biosignals produced by each individual are unique due to difference in individual physiological properties and skin conductance. II. LITERATURE REVIEW Satish Kumar et.al, 2015 have proposed a low-cost Electrooculogram (EOG) acquisition system that can be used efficiently in Human Machine Interface (HMI) systems. The proposed system consists of an Op-Amp based EEG/EOG amplifier circuit and ATMega8 microcontroller for analog to digital conversion and transferring of acquired data to PC. In this system five electrodes are used to acquire eye blinking, horizontal and vertical eye movements. In this system, the signals are first captured using EEG surface electrodes, amplified, filtered and then converted into digital form before stored into PC. The acquired EOG signal provides different eye related activities. Depending upon these eye related activities various systems can be developed to perform different tasks in real world, which provides a degree of independence to the user [1].
  • 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 667 Kousik Srathy Sridharan, 2012 in his thesis work has built a portable system to acquire and analyse electro-oculographic (EOG) signals in real-time. The system contains two sub-systems; a hardware sub-system that consists of the filters, amplifiers, data acquisition card and isolation and the software sub-system that contains the program to acquire and analyse the signal and present the results to the observer .In his work, one paradigm records only normal blinks while the other records long blinks and the results showed differences in detection and error rates. The observations made from performance tests at various levels gave satisfactory results and proved the usefulness of the system for sleep state and drowsiness detection [2]. A Saravananet, 2015 have designed a system which incorporates Texas embedded processor, wireless communication solutions and highly-customized analog front ends. As a demonstration of concept, this technology uses instrumentation amplifiers as analog front end and further single supply quad op-amp for analog signal processing in an effective manner [3]. W S Wijesoma et.al, 2005.In this paper a complete system is presented that can be used by people with extremely limited peripheral mobility but having the ability for eye motor coordination. The Electrooculogram signals (EOG) that results from the eye displacement in the orbit of the subject are processed in real time to interpret the information and hence generate appropriate control signals to the assistive device. The effectiveness of the proposed methodology and the algorithms are demonstrated using a mobile robot for a limited vocabulary [4]. Ali Marjaninejad, Sabalan Daneshvar, 2014. In this paper an EOG based low-cost real-time wheelchair navigation system for severely disabled people is present d using signal processing techniques, bio-amplifiers and a microcontroller driven servomotor. All the digital signal processing and execution of commands were performed utilizing a microcontroller which drastically reduced the total cost of this project. The servomotor has been synchronized with the computed eye direction resulted from processing the horizontal EOG signal. The speed of the wheelchair was also regulated with the same EOG signal. Performed tests indicated that in 98.5% of trials, subjects could navigate to their targets in presence of simple obstacles in their first attempts which confirm the feasibility of the proposed system [5]. III. SYSTEM DEVELOPMENT The eye is known to have a resting potential and acts as a dipole in which the anterior pole (cornea) is positive and the posterior pole (retina) is negative as shown in the figure 1.1.The magnitude of this cornea-retinal potential is in the range 0.4- 1.0 mV. This difference in potential can be explained by the metabolic activities in the eye. The Electrooculogram (EOG) signal thus is derived from the polarization potential, also known as the Corneal-Retinal Potential (CRP), generated within the eyeball by the metabolically active retinal epithelium. The CRP is produced by means of hyper-polarizations and de- polarizations of the nervous cells in the retina .Electrooculography (EOG) is a technique for measuring this resting potential. The resulting signal is called the Electrooculogram. Fig. 1: Polarity of Eye Fig.2: EOG signal based on eyeball movement
  • 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 668 The amplitude of the EOG signal is known to be in microvolt range (15 - 200 uV) and most of the information is contained in 0 Hz to 38 Hz frequency range with dominant component in 0 to 25 Hz range. Specially designed electrodes for EOG are placed on the corners (lateral canthi) of both the eyes. When the eyes look left the positive end of the dipole (the eye) comes closer to the electrode on the left canthus and the negative end to the right canthus. The vice versa is observed for the eyes looking towards right. Ideally the difference in potential should be proportional to the sine of the angle the eye produces with respect to the central axis. Fig. 3: EOG Block Diagram of the System A. Method used for EOG based assistive technique Basic Block Diagram of EOG based HMI system is given in Fig 4. Fig. 4: Basic Block Diagram of EOG based HMI system
  • 4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 669 The development work involved three parts: 1. Signal acquisition part included development of DAQ. 2. Signal classification part included classification of basic eye movement types and blink. 3. Application part involved implementation of rehabilitation devices which can be controlled using EOG. Fig. 5: Electrooculography electrode placements EOG signals were measured by placing electrodes on the region surrounding the eye. They were recorded from two separate regions: horizontal and vertical. Horizontal electrodeswere for detecting horizontal eye movements (left and right eye movement) and vertical electrodes were for detecting vertical movements (up and down cornea movements). B. Flowchart 1) Flowchart for blink detection Fig. 6: Flowchart for blink detection 2) Flowchart for detecting right-left eye movement An EOG signal corresponding to right-left eye movement was dominated in horizontal channel. Hence for easy analysis, right- left classification algorithm was applied to EOG signals form horizontal channel. Algorithms were carried out simultaneously and in parallel.
  • 5. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 670 Right and left eye movement we experienced almost the same amplitude and the amplitude of EOG signal was around 290µv. But there was a slight difference in the voltage during movement of eye from right to left. Fig. 7: Flowchart for detecting right-left eye movement IV. RESULTS In the present work, an EOG signal acquisition system has been designed and implemented. Additionally, a new algorithm for EOG classification and control signal generation was also developed. This algorithm required much less user training than other classification algorithms. Hence it is very much useful for the implementation of rehabilitation aids. As a part of this project, an EOG based Human Machine Interface has been developed. This HMI was able to generate control signals during various eye movements and blinks. The following figures below indicate the system results in for different eye movements. A. 5.1 Eye movement detection Fig. 8: Left eye movement was detected and device-1 is turned ON The Fig. 8 shows movement of left eye and EOG electrode placement Vertical EOG signals and horizontal EOG signals were processed in parallel.Signal amplitudes were compared with the corresponding threshold values. Once it crossed the threshold, the duration for which it holds the threshold value was calculated. If both duration and amplitude condition were satisfied, it generated one control signal. Control signal was generated in such a way that it remained high for the next 2 seconds. Even though the input signal changed, its values did not vary during this time. This kept the system in minimum error and maximum control. The generated command signals were used to turn on the electric bulb and it is shown in Fig. 8.
  • 6. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 671 B. Eye Blink sensor output In blink detection, the comparator was used to detect blinking action. If amplitude of the signal was above threshold and pulse duration was within the range, it detected as blinking and device-2 is controlled . Fig. 9:Eye blink was detected and decive-2 is turned ON V. Conclusions In the present work, an EOG signal acquisition system has been designed and implemented. Additionally, a new algorithm for EOG classification and control signal generation was also developed. This algorithm required much less user training than other classification algorithms. Hence it is very much useful for the implementation of rehabilitation aids. As a part of this project, an EOG based Human Machine Interface has also been developed. This HMI was able to generate control signals during various eye movements and blinks. These control signals were used to control electric device model by various eye movements and blink. This EOG based HMI control system for electric device will be a good assistive technique for people suffering from extremely limited peripheral mobility. From the application point of view, control signals generated can be used to control HCI systems or other communication devices. As a whole, great prospects lie ahead for the current project which can be implemented with some further modifications. REFERENCES [1] Andreas bulling, Jamie A. ward, Hans gellersen, Gerthar troster, “Eye movement analysis for activity recognition using electrooculgraphy” IEEE transactions on pattern analysis and machine intelligence, vol 33, NO. 4, April 2011. 1323 International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 5, May – 2013 [2] David Raamirez Perez, “Human Machine Interface Communication using EOG for handicapped people”, Congress on Instruments and Applied Sciences. [3] Siriwadee Aungsakun, Angkoon Phinyomark, Pornchai Phukpattaranont and Chusak Limsakul, “Development of robust electrooculgraphy (EOG) - based human-computer interface controlled by eight-directional eye movements”, International Journal of Physical Sciences, vol 7(14), pp. 2196- 2208. [4] Nolan Y M, “Control and communication for physically disabled people, based on vestigial signals from the body”, PhD thesis paper submitted to National University of Ireland, Dublin, 2005, pp. 7-18. [5] Malik Q A and Ahmad J, “Retina Based Mouse Control (RBMC)”, World Academy of Science, Engineering and Technology, (7); (2007) pp. 318-321.
  • 7. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 672 [6] Ahsan M R, Ibrahimy M I and Khalifa , “EMG Signal Classification for Human Computer Interaction: A Review”, European Journal of Scientific Research, 33 (3); (2009), pp. 480-501. [7] Lotte N S and Struijk A, “An Inductive Tongue Computer Interface for Control of Computers and Assistive Devices”, IEEE Transactions on Biomedical Engineering, 53(12); (2006), pp. 2594-2597. [8] Gopi E S, Sylvester R, Rangarajan V and Nataraj L, “Brain Computer Interface Analysis using Wavelet Transforms and Auto Regressive Coefficients”, International Conference on Electrical and Computer Engineering (ICECE’06), Dhaka, Bangladesh, (2006), pp.169 – 172. [9] Wolpaw J R, Birbaumer N, Mcfarland D J, Pfurtscheller G and Vaughan T M, “Brain Computer Interfaces for communication and control”, Clinical Neurophysiology, 113 (6); (2002), pp. 767–791. [10] Barcia J C, “Human Electrography Interface”, Master in Physics Engineering thesis submitted to Lisbon Technical University, (2010), pp. 03-09. [11]Guyton A C and Hall J E, “Textbook of medical physiology”, International edition, 11th edition. Elsevier Saunders, (2006), pp. 626-639. [12] Merino M, Rivera O, Gomez I, Molina A and Dorronzoro E, “A Method of EOG Signal Processing to Detect the Direction of Eye Movements”, Proceedings of the 2010 First International Conference on Sensor Device Technologies and Applications, Venice, Italy, (2010), pp.100-105. [13] Usakli A B, Gurkan S, Aloise F, Vecchiato and Babiloni F, “On the Use of Electrooculogram for Efficient Human Computer Interfaces”, Computational Intelligence and Neuroscience, 2010; (2010), pp. 1-5. [14] D’Mello P C and D’Souza S, “Design and development of a Virtual Instrument for Biosignal Acquisition and Processing using LabVIEW”, International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, 1(1); (2012), pp. 1-5.