30-08-2014, 03:30 PM
Virtual keyboard Seminar Report
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ABSTRACT
Computing is now not limited to desktops and laptops, it has
found its way into mobile devices like palm tops and even cell phones.
But what has not changed for the last 50 or so odd years is the input
device, the good old QWERTY keyboard. Virtual Keyboard uses sensor
technology and artificial intelligence to let users work on any surface
as if it were a keyboard. Virtual Devices have developed a flashlightsize
gadget that projects an image of a keyboard on any surface and
let’s people input data by typing on the image. The Virtual Keyboard
uses light to project a full-sized computer keyboard onto almost any
surface, and disappears when not in use. Used with Smart Phones and
PDAs, the VKEY provides a practical way to do email, word processing
and spreadsheet tasks, allowing the user to leave the laptop computer
at home.
INTRODUCTION
Virtual Keyboard is just another example of today’s computer trend of ‘smaller
and faster’. Computing is now not limited to desktops and laptops, it has found its way
into mobile devices like palm tops and even cell phones. But what has not changed for
the last 50 or so odd years is the input device, the good old QWERTY keyboard.
The virtual keyboard technology is the latest development. The virtual keyboard
technology uses sensor technology and artificial intelligence to let users work on any flat
surface as if it were a keyboard. Virtual Keyboards lets you easily create multilingual text
Virtual Keyboard
content on almost any existing platform and output it directly to PDAs or even web
pages. Virtual Keyboard, being a small, handy, well-designed and easy to use application,
turns into a perfect solution for cross platform text input.
The main features are: platform-independent multilingual support for keyboard
text input, built-in language layouts and settings, copy/paste etc. Operations support just
as in a regular text editor, no change in already existing system language settings, easy
and user-friendly interface and design, and small file size.
The report first gives an overview of the QWERTY keyboards and the difficulties arising
from using them. It then gives a description about the virtual keyboard technology and
the various types of virtual keyboards in use. Finally drawbacks and the applications are
discussed.
Difficulties
It is now recognized that it is important to be correctly seated while using a
computer. A comfortable working position will help with concentration, quality of work,
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and reduce the risk of long-term problems. This is important for all who use computers,
and especially so for those with disabilities.
The increased repetitive motions and awkward postures attributed to the use of
computer keyboards have resulted in a rise in cumulative trauma disorders (CTDs) that
are generally considered to be the most costly and severe disorders occurring in the
office. Lawsuits for arm, wrist, and hand injuries have been filed against keyboard
manufacturers allege that keyboarding equipment is defectively designed and
manufacturers fail to provide adequate warnings about proper use to avoid injury.
As early as1926, Klockenberg described how the keyboard layout required the
typist to assume body postures that were unnatural, uncomfortable and fatiguing. For
example, standard keyboard design forces operators to place their hands in a flat, palm
down position called forearm pronation. The compact, linear key arrangement also causes
some typists to place their wrist in a position that is skewed towards the little fingers,
called ulnar deviation. These awkward postures result in static muscle loading, increased
muscular energy expenditure, reduced muscular waste removal, and eventual
discomfort or injury. Researchers also noted that typing on the QWERTY keyboard is
poorly distributed between the hands and fingers, causing the weaker ring and little
fingers to be overwork.
VIRTUAL KEYBOARD
Virtual Keyboard is just another example of today’s computer trend of "smaller
and faster". Computing is now not limited to desktops and laptops, it has found its way
into mobile devices like palm tops and even cell phones. But what has not changed for
the last 50 or so odd years is the input device, the good old QWERTY keyboard.
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Alternatives came in the form of handwriting recognition, speech recognition, abcd input
(for SMS in cell phones) etc. But they all lack the accuracy and convenience of a full
blown keyboard. Speech input has an added issue of privacy. Even folded keyboards for
PDAs are yet to catch on. Thus a new generation of virtual input devices is now being
paraded, which could drastically change the way we type.
Virtual Keyboard uses sensor technology and artificial intelligence to let users
work on any surface as if it were a keyboard. Virtual Devices have developed a
flashlight-size gadget that projects an image of a keyboard on any surface and let’s people
input data by typing on the image.
The device detects movement when fingers are pressed down. Those movements
are measured and the device accurately determines the intended keystrokes and translates
them into text. The Virtual Keyboard uses light to project a full-sized computer keyboard
onto almost any surface, and disappears when not in use. The translation process also
uses artificial intelligence. Once the keystroke has been decoded, it is sent to the portable
device either by cable or via wireless.
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Fig 3.1: Virtual keyboard used in PDA’s
The Virtual Keyboard uses light to project a full-sized computer keyboard onto
almost any surface, and disappears when not in use. Used with Smart Phones and PDAs,
it provides a practical way to do email, word processing and spreadsheet tasks, allowing
the user to leave the laptop computer at home. The technology has many applications in
various high-tech and industrial Sectors. These include data entry and control panel
applications in hazardous and harsh environments and medical markets.
Projection key boards or virtual key boards claim to provide the convenience of
compactness with the advantages of a full-blown QWERTY keyboard. An interesting use
of such keyboards would be in sterile environments where silence or low noise is
essential like operation theatres. The advantage of such a system is that you do not need a
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surface for typing; you can even type in plain air. The company's Virtual Keyboard is
designed for anyone who's become frustrated with trying to put information into a
handheld but doesn't want to carry a notebook computer around. There is also the
provision for a pause function to avoid translating extraneous hand movements function
Electronic Perception Technology
Electronic perception technology enables ordinary electronic devices to “see” the
world around them so they can perceive and interact with it. Now everyday electronic
devices in a variety of markets can perceive users’ actions, gaining functionality and ease
of use.
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The tiny electronic perception chips and embedded software work by developing
a 3D “distance map” to nearby objects in real-time. This information is factored through
an on-chip processor running imaging software that translates the image into defined
events before sending it off-chip for application-specific processing. It’s an action that is
continually repeated, generating over 30 frames of 3D information per second.
Electronic perception technology has a fundamental advantage over classical
image processing that struggles to construct three-dimensional representations using
complex mathematics and images from multiple cameras or points of view. This single
chip “contour mapping” approach results in a high reduction of complexity, making it
possible to embed the application independent processing software directly into the chips
themselves – so they may be used in the most modestly-priced, and even pocket-sized
electronic devices.
The pattern projector
The Pattern Projector or optional printed image presents the image of the
keyboard or mouse zone of the system. This image can be projected on any flat surface.
The projected image is that of a standard QWERTY keyboard, with all the keys and
control functions as in the keyboard.
The Projector features a wide-angle lens so that a large pattern can be projected
from relatively low elevations. A printed image, with replaceable templates allows system
flexibility, permitting most any kind of keyboard configuration for greater functionality.
In some types of virtual keyboards, a second infra-red beam is not necessary. Here
the projector itself takes the inputs, providing dual functionality. A sensor or camera in
the projector picks up the finger movements, and passes the information on to the sensor
modules
Sense board Technologies
The Sense board SB 04 technology is an extreme case of a hybrid approach. The
sensing transducer is neither a laser scanner nor a camera. Rather, it is a bracelet like
transducer that is worn on the hands which captures hand and finger motion. In fact, as
demonstrated, the technology does not incorporate a projection component at all; rather, it
relies on the user's ability to touch type, and then infers the virtual row and key being
typed by sensing relative hand and finger movement. The system obviously could be
augmented to aid non-touch typists, for example, by the inclusion of a graphic
representation of the virtual keyboard under the hands/fingers. In this case, the keyboard
graphically represented would not be restricted to a conventional QWERTY keyboard,
and the graphical representation could be projected or even on a piece of paper. I include
it here, as it is a relevant related input transducer that could be used with a projection
system. The technology has patents pending, and is currently in preproduction proof of
Concept form
KITTY
KITTY, a finger-mounted keyboard for data entry into PDA's, Pocket PC's and
Wearable Computers which has been developed at the University of California in Irvine.
KITTY, an acronym for Keyboard-Independent Touch-Typing, is a Finger mounted
keyboard that uses touch typing as a method of data entry. The device targets the portable
computing market and in particular its wearable computing systems which are in need of
a silent invisible data entry system based on touch typing .the new device combines the
idea of a finger mounted coding device with the advantages of a system that uses touch
typing
InFocus
InFocus is one of the leading companies in providing video and data projectors.
Their projectors are conventional, in that they do not use laser technology. This has that
advantage of delivering high quality colour images with a mature technology. However, it
has the disadvantage of larger size, lower contrast, and higher power requirements,
compared to laser projection systems. In 2000, InFocus merged with Proxima, which had
been one of its competitors. I include InFocus/Proxima in this survey not only because
they make projectors. In their early days, Proxima developed one of the first
commercially available projection/vision systems. It was called Cyclops, and they still
hold a patent on the technology. Cyclops augmented the projector by adding a video
camera that was registered to view the projection area. The video camera had a band pass
filter over the lens, which passed only the wavelength of a laser pointer.
The system, therefore, enabled the user to interact with the projected image, using
a provided laser pointer as the input device. The camera detected the presence of the laser
pointer on the surface, and calculated its coordinates relative to the currently projected
image. Furthermore, the laser pointer had two intensity levels which enabled the user to
not only point, but to have the equivalent of a mouse button, by the vision system
interpreting the two levels as distinguishing button up and down events
CONCLUSION
Virtual Keyboard uses sensor technology and artificial intelligence to let users
work on any surface as if it were a keyboard. Projection key boards or virtual key boards
claim to provide the convenience of compactness with the advantages of a full-blown
QWERTY keyboard. The company's Virtual Keyboard is designed for anyone who's
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become frustrated with trying to put information into a handheld but doesn't want to carry
a notebook computer around.
Canesta appears to be the most advanced in this class of technology. Different
types of virtual keyboards suit different typing styles. Thus virtual keyboards will make
typing easier, faster, and almost a pleasure.