What is Blue eye technology?
A researcher at Stanford has created an alternative to the mouse that
allows a person using a computer to click links, highlight text, and
scroll simply by looking at the screen and tapping a key on the
keyboard. By using standard eye-tracking hardware--a specialized
computer screen with a high-definition camera and infrared lights--Manu
Kumar, a doctoral student who works with computer-science professor
Terry Winograd, has developed a novel user interface that is easy to
"Eye-tracking technology was developed for disabled users," Kumar
explains, "but the work that we're doing here is trying to get it to a
point where it becomes more useful for able-bodied users." He says that
nondisabled users tend to have a higher standard for easy-to-use
interfaces, and previously, eye-tracking technology that disabled
people use hasn't appealed to them.
At the heart of Kumar's technology is software called EyePoint
that works with standard eye-tracking hardware. The software uses an
approach that requires that a person look at a Web link, for instance,
and hold a "hot key" on the keyboard (usually found on the number pad
on the right) as she is looking. The area of the screen that's being
looked at becomes magnified. Then, the person pinpoints her focus
within the magnified region and releases the hot key, effectively
clicking through to the link.
Kumar's approach could take eye-tracking user interfaces in the
right direction. Instead of designing a common type of gaze-based
interface that is controlled completely by the eyes--for instance, a
system in which a user gazes at a given link, then blinks in order to
click through--he has involved the hand, which makes the interaction
more natural. "He's got the right idea to let the eye augment the
hand," says Robert Jacob, professor of computer science at Tufts
University, in Medford, MA.
Rudimentary eye-tracking technology dates back to the early
1900s. Using photographic film, researchers captured reflected light
from subjects' eyes and used the information to study how people read
and look at pictures. But today's technology involves a high-resolution
camera and a series of infrared light-emitting diodes. This hardware is
embedded into the bezel of expensive monitors; the one Kumar uses cost
$25,000. The camera picks up the movement of the pupil and the
reflection of the infrared light off the cornea, which is used as a
reference point because it doesn't move.
Even the best eye tracker isn't perfect, however. "The eye is
not really very stable," says Kumar. Even when a person is fixated on a
point, the pupil jitters. So he wrote an algorithm that allows the
computer to smooth out the eye jitters in real time. The rest of the
research, says Kumar, involves studying how people look at a screen and
figuring out a way to build an interface that "does not overload the
visual channel." In other words, he wanted to make its use feel natural
to the user.
One of the important features of the interface, says Kumar, is
that it works without a person needing to control a cursor. Unlike the
mouse-based system in ubiquitous use today, EyePoint provides no
feedback on where a person is looking. Previous studies have shown that
it is distracting to a person when she is aware of her gaze because she
consciously tries to control its location. In the usability studies
that Kumar conducted, he found that people's performance dropped when
he implemented a blue dot that followed their eyes.
system designing will be adapted to your needs and what you want in a computer.
4. System overview mentions the configuration of your system in both hardware and also software
Mar 06, 2009 |
Computers & Internet