It is a power point presentation on a new technology call virtual keyboard. It simulates the job of a keyboard and allows users to communicate with different devices. This presentation also consist the working mechanism of the projection based virtual keyboard.

1. Department of Presented By:
MCA Siddhartha Sadhukhan
And
Siddhartha Banerjee

2. Introduction
 A virtual keyboard allows a user to communicate with
computer.
 Virtual keyboard is a technological breakthrough.
 Virtual keyboard is well suited with today’s computer
trend.
 Easy for bi- or multi-lingual users .
 Modern virtual keyboards display a projection of a
image of a keyboard and allow type on it.
 The Virtual Keyboard is not restricted to the QWERTY
touch-typing paradigm.

3. Overview
 An optical virtual keyboard was invented and patented by
IBM engineers in 1992.
 Virtual Keyboards is a flashlight-size gadget that projects
an image of a keyboard on non-reflexive surface.
 It uses sensor technology and artificial intelligence.
 The device detects movement of fingers, and make the
proper key-stroke.

4. Modules
The virtual keyboard system comprise of three module:
 The sensor module:
 Serves as the eyes of the Keyboard Perception technology.
 This module determines the appropriate
key-stroke and generates the
corresponding code and it to the host
device.

5.  IR-light source
 Emits invisible infrared beam.
 The Infrared Light Source emits a beam of infrared light
and overlap the area on which keyboard
is projected.
 This helps in recognizing the hand
movements and the pressing of keys.

6.  The pattern projector
 Projects an image of the keyboard on any flat-surface.
 The Projector has wide-angle lens so
that a large pattern can be projected
from relatively low distance.
 The template serves only as a
reference for the user and is not involved
in the detection process

7. Working Mechanism
 Step 1: A image of a keyboard is projected.
 Step 2: An infrared plane of light is generated just above
the projection keyboard.
 Step 3: Finger movement breaks the infrared plane and
reflects light beam which is picked up by a CMOS chip.

8. Other Types of VKB
 Canesta
 Projection of a keyboard.
 Allow work on that projection.
 Small in size.
 Kitty
 Developed at the University of California
in Irvine.
 Wearable "virtual" keyboard.
 Using spiraling, printed-electric circuit wires that
wrap around the fingers detects key-stroke.
 On-screen Keyboard
 It is a software component.
 It can usually be operated with
multiple input device

9.  Advantages
 Can be projected on any non-reflective surface.
 Create low noise.
 Not restricted to the QWERTY touch-typing paradigm.
 Highly portable.
 Free from hardware based key-logger.
 Disadvantages
 Hard to use.
 Very costly.
 The room where we use vkb should not be very bright.
 Without the feel of the keys slowing you down and possibly
even creates a inaccurate document.
 The IR light is affected by sunlight.
 Alignment needed between IR transmitter and IR detector.

10. References
 https://en.wikipedia.org/wiki/Computer_keyboard
 https://en.wikipedia.org/wiki/Virtual_keyboard
 https://en.wikipedia.org/wiki/Projection_keyboard
 http://www.howtechnologywork.com/virtual-laser-keyboard/
 http://www.extremetech.com/extreme/51958-canesta-says-virtual-
keyboard-is-reality
 https://www.siggraph.org/s2003/conference/etech/everyday.html
 http://electronics.howstuffworks.com/gadgets/travel/virtual-laser-
keyboards.htm
 http://www.virtual-laser-devices.com/demo.asp

11. Any Question ?

12. Thank
you