1. Presented By:-
S P Rohit (CSE Branch)
Seminar on Virtual Keyboard Technology

2. Introduction
Qwerty keyboard
Virtual keyboard
Modules of Virtual keyboard
System Architecture
Advantages
Drawbacks
Applications
Conclusion
References

3. Introduction
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.

4. 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:
 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.
Qwerty keyboard

5. The microprocessor and controller circuitry of a keyboard
A look at the key matrix

6. Virtual keyboard
 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.

7. Virtual keyboard used in PDA’s
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 .

8. Modules of Virtual Keyboard
The Virtual Keyboard system comprises of three modules:-
 The sensor module
 IR-light source
 The pattern projector

9. Sensor module:
The Sensor Module 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.

10. IR Light source :
 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 .

11. Pattern projector:
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.

12. System Architecture
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.
Virtual-keyboard demonstration-
system setup
The display projector is mounted on the camera, facing the same area, which
would generate the visual feedback for the keyboard and input information.

13. Working layout of a Virtual Keyboard:-

14. Advantages
Portability
Accuracy
Speed of text entry
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.

15. Drawbacks
 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.

16. Applications
 High-tech and industrial Sectors.
 Used with Smart phones, PDAs, email, word processing and
spreadsheet tasks.
 As computer/PDA input.
 Gaming control.

17. Conclusion
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.

18. References
1) "Bluetooth Virtual Laser Keyboard | Bluetooth Laser Virtual Keyboard cl850
Projection." Bluetooth Laser Keyboard - Before Purchase Bluetooth Laser Keyboard
information. N.p., n.d. Web. 2 Mar.
2012. http://www.bluetoothlaserkeyboard.net/virtual.html
2) Kölsch, M & Matthew Turk Keyboards Without Keyboards: A Survey of Virtual
Keyboards. , . retrieved march 2, 2012,
from http://www.cs.ucsb.edu/~mturk/pubs/KolschKeyboards.pdf
3) "Seminar report on Virtual Laser Keyboard." Scribd. N.p., n.d. Web. 2 Mar.
2012 http://www.scribd.com/animeshp1/d/63955060-Seminar-report-on-Virtual-Laser-
Keyboard
4) Chien, Huan-Wen . "Virtual keyboard." Patents.com. N.p., n.d. Web. 2 Mar.
2012. http://www.freshpatents.com/Virtual-keyboard-dt20061019ptan20060232558.php