A virtual keyboard is actually a key-in device, roughly a size of a fountain pen & which uses highly advanced laser technology.

1. Seminar on Virtual Keyboard
Technology
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2.  Introduction
 Qwerty keyboard
 Virtual keyboard
 Virtual keyboard Technology
 System Architecture
 Connectivity
 Reason to use Virtual Keyboard
 Advantages
 Drawbacks
 Applications
 Conclusion
 References
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3. The virtual keyboard was invented in 2002 by a team of researchers
from the Israeli-based company KVB. The invention uses a red laser to
project the keyboard onto a flat surface.
The aim of this technology is to develop an “Augmented Reality” (AR)
solution for a handheld device that enables the user to write text.
A virtual keyboard is actually a key-in device, roughly a size of a
fountain pen & which uses highly advanced laser technology.
In a virtual keyboard, camera tracks the finger movements of the typist
to get the correct keystroke.
The software and hardware part recognizes the typed characters and
pass it to the computer.
The main features are: platform independent multilingual support for
keyboard text input, built-in language layout and setting, copy/paste etc.
Introduction
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5.  QWERTY is the most common keyboard layout on English-
language computer and typewriter keyboards.
 The processor in a keyboard has to understand several things
that are important to the utility of the keyboard, such as:
Qwerty keyboard
 Position of the key in the key
matrix.
 The amount of bounce and how
to filter it.
 The speed at which to transmit
the typematics
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6. The microprocessor and controller circuitry of a keyboard
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7.  Virtual Keyboard is just another example of today’s computer trend
of "smaller and faster“.
 Virtual Keyboard uses sensor technology and artificial intelligence
to let users work on any surface as if it were a keyboard.
 The keyboard is projected optically on a flat surface and, as the user
touches the image of a key, the optical device detects the stroke and
sends it to the computer.
 The Projected Keyboard size is usually 295 mm × 95 mm. &
distance of 60 mm from the virtual keyboard Unit.
 It is detects up to 400 characters per minute.
 The keyboard unit works on lithium-ion batteries and offers at least
120 minutes of continuous typing.
Virtual keyboard
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8.  A virtual keyboard is a keyboard that a user operates by typing on or
within a wireless or optical-detectable surface or area rather than by
depressing physical keys.
 The Virtual Keyboard uses light to project a full-sized computer
keyboard onto almost any surface, and disappears when not in use.
 A virtual keyboard makes it possible for the user of a very small smart
phone or a wearable computer to have full keyboard capability.
 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 .
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9. The Virtual Keyboard system comprises of three modules:-
 The sensor module
 IR-light source
 The pattern projector
Virtual Keyboard Technology
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10. The Sensors are hardware component
that can serves as the eyes of the
Keyboard Perception technology .
The Sensor Module operates by locating
the user's fingers in 3-D space and
tracking the intended keystrokes.
Keystroke information processes and
can then be output to host devices.
Sensor module:
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11.  The Infrared Light Source emits a beam of
infrared light .
 This light beam is designed to overlap the area
on which the keyboard pattern projector or
printed image resides.
 This helps in recognizing the hand movements
and the pressing of keys .
IR Light source :
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12. The Pattern Projector or optional printed image presents the image of
the keyboard
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.
Pattern projector:
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13. This Fig. shows the physical setup
of the system:-
 The 3D range camera is placed several cms
over the input surface, with a well-defined
angle facing the working area.
 The size of the working area, limited by
the spatial resolution of the camera, is 15
cm × 25 cm, which is comparable to a full-
size laptop-computer keyboard.
The display projector is mounted on the camera,
facing the same area, which would generate the visual
feedback for the keyboard and input information.
System Architecture
System Architecture
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15. Working layout of a Virtual Keyboard:-
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16. Connectivity
Two way to connect the computer with
Projection keyboards :
Bluetooth
USB
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17. Bluetooth
A short- range, non-line-of-sight wireless technology
operating over a typical distance of around 30 feet and
geared towards easy data exchange between fixed and
electronic devices.
Connect with any Bluetooth HID(Human Interface
Device) devices
Bluetooth devices, such as PCs, PDAs and mobile phone.
Compatible operating systems: iOS 4+, Android 4.0+,
Windows XP+, Mac OS X, Blackberry 10.
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18. USB (Universal Serial Bus):
Defines the cables, connectors and
communications protocols used in a bus for
connection, communication, and power supply
between computers and electronic devices.
The connection between the USB keyboard
and the device is made through a USB Port,
which is available on every computer and (via an
adapter), other devices.
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19. When Connected to your handheld computer it
is more convenient to carry around than your
laptop.
It takes up less desk space than a conventional
keyboard.
You could use it with your desktop, laptop or
handheld computer.
Reasons to use Virtual Keyboard
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20. Compare the following two pictures.
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21.  Portability
 Accuracy
 Speed of text entry
 High battery life.
 They can fit easily into pocket or carrying bag.
 Lack of need for flat or large typing surface
 Ability to minimize the risk for repetitive strain injuries.
 No driver software necessary, It can be used as a plug and play device.
Advantages
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22.  It is very costly.
 The room in which the virtual keyboard is used should not be very
bright so that the keyboard is properly visible.
 Virtual keyboard is hard to get used to. Since it involves typing in
thin air, it requires a little practice. Only people who are good at
typing can use a virtual keyboard efficiently.
Drawbacks
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23.  High-tech and industrial Sectors.
 Used with Smart phones, PDAs, email, word processing and
spreadsheet tasks.
 Small Sleek
 As computer/PDA input.
 Gaming control.
Applications
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24.  A virtual key boards claim to provide the convenience of compactness
with the advantages of a QWERTY keyboard.
 A Virtual keyboard system based on a true-3D optical range camera.
 It is also used in 6th Sense Technology Device in which it is not
depends on surface. The feedback text and/or graphics may be
integrated with such projector, thus enabling truly virtual working
area.
 Thus virtual keyboards will make typing easier, faster, and almost a
pleasure.
Conclusion
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25. References
[1]www.wikipedia.org
[2]www.howstuffworks.com
[3]www.virtualkeyboard.com
[4]www.engineeringseminar.org
[5]www.itech.com/vkey/specification
[6] www.microsoft.com/vkb
[7] http://www.cectcellphone.com
[8] http://en.wikipedia.org/wiki/Augmented_reality
[9]http://en.wikipedia.org/wiki/QWERTY_keyboard
[10]http://www.scribd.com/doc/63955060/Seminar-report-on-Virtual-Laser-
Keyboard
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