Dissertation on Virtual Keyboard Text

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On screen keyboard or virtual keyboard is a projected keyboard layout displayed on the screen for the use of different programs that requires input from a keyboard. A standard mouse is generally used but a number of alternatives are available that addresses different kinds of disabilities. These alternatives, according to public service commission of canada 2007 include 'foot/toe mouse, touchpad, trackballs, infrared/camera optical mouse and sip 'n' puff switches.' eye tracking is the process of measuring either the point of gaze or the motion of an eye relative to the head. According to eye trackers measure rotations of the eye in one of several ways, but principally they fall into three categories. One type uses an attachment to the eye, like a special contact lens with a mirror or a sensor embedded magnetic field, and the movement of attachment is measured with the assumption that it does not slip significantly as the eye rotates. Measurement with fitting contact lens has a very sensitive recording of eye movements, and magnetic search coils are the method of choice for researchers studying the underlying dynamics and physiology of eye movements. Our writers can help get your essay back on track, take a look at our services to learn more about how we can help.

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Essay writing service essay marking service place an order the second broad category uses non contact, optical method for measuring eye movements. Light, usually ir, reflected in the eyes and feel with a video camera or some other optical sensor designed specifically. This information is then analyzed to extract eye rotation from changes in the reflection.

Video based eye trackers typically use the corneal reflection and the center of the pupil as to detect features from time to time. A more sensitive type of eye tracker, the dual purkinje eye tracker uses reflections from the front of the cornea and the back of the lens as features to track. A more sensitive method is to image features from inside the eye, such as retinal blood vessels, and follow these features as the eye rotates. Optical methods, particularly those based on video recordings, are widely used and preferred to gaze tracking for non invasive and inexpensive. Crane amp steele, 1985 the third category uses potential measured using electrodes placed around the eyes. It is the origin of the stationary electric field, which can also be detected in total darkness, and if the eyes are closed.

It can be produced by the dipole model to the positive pole of the cornea and the negative pole of the retina. The electrical signals that can be derived using two pairs of electrode contacts placed on the skin around the eyes are called electrooculogram eog. It is a very light weight approach that, in contrast to current video based eye trackers, only requires very low computational power, works under different lighting conditions and can be implemented as an embedded, self contained wearable system. Bulling, roggen, amp tr'ster, 2009 it is thus the method of choice for measuring eye movement in mobile daily life situations and rem phases during sleep. 2.2 eye tracking related researches and products in developing this study, we have found several researches that have similar study to this topic. These products and previous studies were useful to us as guidelines and provided a lot of details to help accomplish all of the objectives. 2.2.1 eye gaze response interface computer aid erica eye gaze response interface computer aid erica is a device that tracks eye movement to enable hands free computer operation.

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From the features of the current portrait, the interface calculates the approximate location of the user's eye gaze on the computer screen. The computer then executes commands associated with the menu option currently displayed at this screen location. In this way, the user can interact with the computer, run applications software, and manage peripheral devices all simply by looking at an appropriate sequence of menu options displayed on the screen. White, martin, reichert, amp frey, 1989 the device can also deliver a synthetic voice output.

The technology can allow users to speak, write e mail, surf the internet, create documents, or play games through eye movement alone. Reitan, 2005 with the eyegaze edge people with physical disabilities can do many things with their eyes that they would otherwise do with their hands. Simply by looking at control keys displayed on a computer monitor screen, the user can perform a broad variety of functions including speech synthesis, environmental control, sending emails, browsing the internet, playing games, typing, and controlling most pc and mac computers. It is a communication and control system for people with complex physical disabilities.

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By looking at control keys displayed on a screen, a person can synthesize speech, control his environment lights, call bells, etc. , type, run computer software, operate a computer mouse, and access the internet and e mail. Eyegaze edge systems are being used to write books, attend school and enhance the quality of life of people with disabilities all over the world.

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