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Eye Tap
Abstract: An Eye Tapis a device that is worn in f ront of
theeyethat acts as a camera to record the scene
available to the eye as well as a display to superimpose a
computer-generated imagery on the origi nal scene
available to the eye. Th is structure all ows the user' s eye to
operate as both a monitor and a camera as the Eye tap
in takes the worl d around i t and augments the image the user
sees all owing it to overl ay computer-generated data
over top of the normal worl d the user would perceive. The Eye
tap is a hard technol ogy to categori ze under the
three main headers for wearable computing (constancy,
augmentation, mediation) for whil e it i s in theory a
constancy technol ogy in natur e it also has the abil ity to
augment and mediate the reality the user perceives.
I n order to captu re what the eye is seeing as accur ately as
possible, an Eye tap uses a beam spli tter to send the
same scene (wi th reduced intensity) to both the eye and a
camera. The camera then digiti zes the refl ected image
of the scene and sends it to a computer. The computer pr ocesses
the image and then sends it to a projector . The
proj ector sends the image to the other side of the beam split
ter so that th is computer -generated image is reflected
in to the eye to be superimposed on the ori ginal scene. Stereo
Eye taps modif y li ght passing through both eyes, but
many research prototypes (mainl y for reasons of ease of
constructi on) onl y tap one eye.
Introduction:
Eye tap is a device which allows, in a sense, the eye itself to
function as both a display and a camera. Eye tap is at
once the eye piece that displays computer information to the
user and a device which allows the computer to process
and possibly alter what the user sees. That which the user looks
at is processed by the Eye tap. This allows the Eye
tap to, under computer control, augment, diminish, or otherwise
alter a user's visual perception of their environment,
which creates a Computer Mediated Reality. Furthermore, ideally,
Eye tap displays computer-generated information
at the appropriate focal distance, and tonal range. The figure
below depicts and describes the basic functional
principle of Eye tap. Note from the diagram that the rays of
light from the environment are collinear with the rays of
light entering the eye (denoted by the dotted lines) which are
generated by a device known as the aremac. "aremac"
is the word camera spelled backwards and is the device which
generates a synthetic ray of light which is collinear
with an incoming ray of light. Ideally, the aremac will generate
rays of light to form an image which appears to be
spatially aligned, and appears at with the same focus as the
real world scene.
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Conclusion
By contrast, in Eye tap devices, the diverter (which may be a
double-sided mirror or a beamsplitter) places the centre
of projection of the camera at (in an optical sense) the centre
of projection of the lens of an eye of the wearer. When
no computer mediation is used, Eye tap video can be displayed to
the user in such a way that the user perceives what
he/she would otherwise have in the absence of the device. Eye
tap mediates a portion of the user's vision, in such a
way that it is integrated with the un-mediated portion of the
user's field of view, without any mismatch between the
mediated area and the real world.
