19-02-2011, 01:08 AM
ABSTRACT
Information and communication technologies can have a key role in helping people with educational needs, considering both physical and cognitive disabilities. Replacing a keyboard or mouse, with eye-scanning cameras mounted on computers have become necessary tools for people without limbs or those affected with paralysis. This system acts as an interface between the person and the computer. It can be like an input device or eye tracking device. The idea behind this is pretty simple. When we look at a particular object the image of that object is formed on the eye. Similarly, if we gaze at a character, The camera scans the image of the character formed on the eye, allowing users to ‘type’ on a monitor as they look at the visual keyboard. The paper describes an input device, based on eye scanning techniques that allow people with severe motor disabilities to use gaze for selecting specific areas on the computer screen. The visual key system gives overall idea on how does this process goeson, also deals with the system architecture which includes calibration, image acquisition, segmentation, recognition, and knowledge base.
The paper mainly includes three algorithms, one for face position, for eye area identification, and for pupil identification which are based on scanning the image to find the black pixel concentration. Inorder to implement this we use software called dasher, which is highly appropriate for computer users who are unable to use a two handed keyboard. One-handed users and users with no hands love dasher. The only ability that is required is sight. Dashers along with eye tracking devices are used.
This model is a novel idea and the first of its kind in the making, which reflects the outstanding thinking of a human that he left no stone unturned.
