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.
2. Introduction
๏ A virtual keyboard allows a user to communicate with
computer.
๏ Virtual keyboard is a technological breakthrough.
๏ Virtual keyboard is well suited with todayโs 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.