CONTENTS
1. Abstract …………………………………………. 1
2. Introduction ……………………………….…….2
3. Keyboard………………………………………..3
4. Virtual Key board………………….……………7
5. Technologies used ……………………..………..8
6. Senseboard Keyboardless Keyboard ……….…10
7. SCURRY – The SAMSUNG Product .…….…...12
8. The CANESTA Keyboard…………………..….13
9. Technology …………..……………….……….16
10. VKEY – From Virtual Devices………………...21
11. NO-Keys -- The Software ………………….....23
12.Application………………………………………25
13. Conclusion ……………………………………...27
14. Appendix ……………………………………….28
15. References ……………………………………..35
VIRTUAL KEYBOARD SEMINAR 2004
ABSTRACT
A virtual keyboard is actually a key-in device, roughly a size of a
fountain pen, which uses highly advanced laser technology, to project a full sized
keyboard on to a flat surface. Since the invention of computers they had
undergone rapid miniaturization. Disks and components grew smaller in size, but
only component remained same for decades –its keyboard. Since miniaturization
of a traditional keyboard is very difficult we go for virtual keyboard. Here, a
camera tracks the finger movements of the typist to get the correct keystroke.A
virtual keyboard is a keyboard that a user operates by typing on or within a
wireless or optical –dectable surface or area rather than by depressing physical
keys.
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INTRODUCTION
Since their invention, computers have undergone rapid
miniaturization from being a ‘space saver’ to ‘as tiny as your palm’. Disks
and components grew smaller in size, but one component still remained the
same for decades – it’s the keyboard.
Miniaturisation of keyboard had proved nightmare for users. Users of
PDAs and smart phones are annoyed by the tiny size of the keys. The new
innovation Virtual Keyboard uses advanced technologies to project a full-
sized computing key-board to any surface. This device has become the
solution for mobile computer users who prefer to do touch-typing than
cramping over tiny keys.
Typing information into mobile devices usually feels about as natural as
a linebacker riding a Big Wheel. Virtual Keyboard is a way to eliminate
finger cramping.
All that's needed to use the keyboard is a flat surface. Using laser
technology, a bright red image of a keyboard is projected from a device
such as a handheld. Detection technology based on optical recognition
allows users to tap the images of the keys so the virtual keyboard behaves
like a real one. It's designed to support any typing speed.
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KEYBOARD
The part of the computer (also that of PDAs, smart phones etc.) that
we come into most contact with is probably the piece that we think about
the least. But the keyboard is an amazing piece of technology. For
instance, did you know that the keyboard on a typical computer system is
actually a computer itself?
Windows keyboard
At its essence, a keyboard is a series of switches connected to a
microprocessor that monitors the state of each switch and initiates a specific
response to a change in that state.
Types of Keyboards
Keyboards have changed very little in layout since their introduction. In
fact, the most common change has simply been the natural evolution of
adding more keys that provide additional functionality.
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The most common keyboards are:
101-key Enhanced keyboard
104-key Windows keyboard
82-key Apple standard keyboard
108-key Apple Extended keyboard
Portable computers such as laptops quite often have custom keyboards
that have slightly different key arrangements than a standard keyboard.
Also, many system manufacturers add specialty buttons to the standard
layout. A typical keyboard has four basic types of keys:
Typing keys
Numeric keypad
Function keys
Control keys
The typing keys are the section of the keyboard that contain the letter
keys, generally laid out in the same style that was common for typewriters.
This layout, known as QWERTY for the first six letters in the layout, was
originally designed to slow down fast typists by making the arrangement of
the keys somewhat awkward! The reason that typewriter manufacturers did
this was because the mechanical arms that imprinted each character on the
paper could jam together if the keys were pressed too rapidly. Because it
has been long established as a standard, and people have become
accustomed to the QWERTY configuration, manufacturers developed
keyboards for computers using the same layout, even though jamming is no
longer an issue. Critics of the QWERTY layout have adopted another
layout; Dvorak that places the most commonly used letters in the most
convenient arrangement.
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An Apple Extended keyboard.
The numeric keypad is a part of the natural evolution mentioned
previously. As the use of computers in business environments increased, so
did the need for speedy data entry. Since a large part of the data was
numbers, a set of 17 keys was added to the keyboard. These keys are laid
out in the same configuration used by most adding machines and
calculators, to facilitate the transition to computer for clerks accustomed to
these other machines.
In 1986, IBM extended the basic keyboard with the addition of function
and control keys. The function keys, arranged in a line across the top of the
keyboard, could be assigned specific commands by the current application
or the operating system. Control keys provided cursor and screen control.
Four keys arranged in an inverted T formation between the typing keys and
numeric keypad allow the user to move the cursor on the display in small
increments. The control keys allow the user to make large jumps in most
applications. Common control keys include:
Home
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End
Insert
Delete
Page Up
Page Down
Control (Ctrl)
Alternate (Alt)
Escape (Esc)
The Windows keyboard adds some extra control keys: two Windows or
Start keys, and an Application key.
Keyboards use a variety of switch technologies. It is interesting to note
that we generally like to have some audible and tactile response to our
typing on a keyboard. We want to hear the keys "click" as we type, and we
want the keys to feel firm and spring back quickly as we press them.
As you type, the processor in the keyboard is analyzing the key
matrix and determining what characters to send to the computer. It
maintains these characters in a buffer of memory that is usually about 16
bytes large. It then sends the data in a stream to the computer via some type
of connection.
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VIRTUAL KEYBOARD
A virtual keyboard is a keyboard that a user operates by typing
(moving fingers) on or within a wireless or optical-detectable surface or
area rather than by depressing physical keys. In one technology, 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. In another technology, the keyboard is projected on an area and
selected keys are transmitted as wireless signals using the short-range
Bluetooth technology. With either approach, a virtual keyboard makes it
possible for the user of a very small smart phone or a wearable computer to
have full keyboard capability. Theoretically, with either approach, the
keyboard can be in space and the user can type by moving fingers through
the air! The regular QWERTY keyboard layout is provided.
All that's needed to use the keyboard is a flat surface. Using laser
technology, a bright red image of a keyboard is projected from a device
such as a handheld. Detection technology based on optical recognition
allows users to tap the images of the keys so the virtual keyboard behaves
like a real one. It's designed to support any typing speed.
Several products have been developed that use virtual keyboard to
mean a keyboard that has been put on a display screen as an image map. In
some cases, the keyboard can be customized. Depending on the product, the
user (who may be someone unable to use a regular keyboard) can use a
touch screen or a mouse to select the keys.
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We simply take our PDA and put it onto the table. It shines a
keyboard onto the table and we just type on the table as if it were a
keyboard.
The only drawback for the touch typist is that we can't rest our
fingers on the keyboard as we would normally. But the manufacturers say
that 10-15 minutes of practice makes perfect.
ADVANTAGES OF VIRTURAL KEYBOARD
Portability
Accuracy
Speed of text entry
Lack of need for flat or large typing surface
Ability to minimize the risk for repetitive strain injuries
Flexibility
Keyboard layouts can be changed by software allowing for foreign or
alternative keyboard layouts
TECHNOLOGIES USED
Several products have been developed by different manufacturers
that use different technologies. In one technology, 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. In
another technology, the keyboard is projected on an area and selected keys
are transmitted as wireless signals using the short-range Bluetooth
technology. Both approaches make it possible for the user to work with the
device with much ease.
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Some products use infrared camera to project the picture of the
keyboard on a surface, while some others use laser beam. Optical
recognition techniques like laser technology are used to translate finger
movements.
In another product sensors are attached to the palm of users. Here
sensor technology combined with artificial intelligence is used to let the
user type in a virtual key environment. This is utilized in the Sense board
models. Two hand-mounted devices connect to the target computing
device with the help of Bluetooth wireless networking technology. The user
can type on a hard surface like a desk or table, or into the air. Through the
use of Bluetooth technology, the "typed" information is transferred
wirelessly to the computer, where a word processing program analyzes and
interprets the signals into readable text.
One product works by attaching motion sensors to each finger. It
doesn't detect muscle movement, but rather uses gyroscopic technology to
detect angular movements of fingers through space. This is applied in the
Samsung models.
The Integrated Canesta Keyboard is based on a controller and two
optical components that project the image of a keyboard onto any flat
surface and use a light source to track the movement of fingers on that
image. It uses the Electronic Perception Technology. The information
picked up is formed into a 3D image with motion and translated into
standard keyboard input data. Canesta's advantage is the fact that as far as
the user is concerned there's no new hardware to buy or install. But PDA
manufacturers are under pressure to add a raft of new features to their
devices, all of which require extra components that take up valuable space
and add to the always sensitive bill of materials. Canesta's advantage is the
fact that as far as the user is concerned there's no new hardware to buy or
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install. But PDA manufacturers are under pressure to add a raft of new
features to their devices.
VKB has developed a highly efficient method for projecting an
optical image of a keyboard onto a surface. In addition, VKB has developed
a detection method through several proprietary developments for the
accurate and reliable detection of user interaction, such as typing or cursor
control functions (e.g. mouse or touch-pad controls). VKB has resolved all
the technological hurdles required to make a practical virtual interface.
There are some products which are meant for the disabled lot. It is
visible on the screen and typing can be done by clicking with mouse or by
touch-screen method.
SENSEBOARD KEYBOARDLESS KEYBOARD
To use the Senseboard device, we simply slip a soft rubber pad onto
each palm and start typing as if a keyboard was in front of us. A demo of
the product didn't work so well, however, and produced the gibberish
"DNiSP" when the tester was asked to type "Comdex." The Sense board
product clearly needs work. Representatives say the poor performance
demonstrated for show attendees is not typical. Sense board works by
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tracking the muscle movements in the palm of the hand. When we
extendyour left pinky finger in midair and strike it down as if we were
going to strike the "Q" key Senseboard displays the letter "Q" on the
monitor.
Two hand-mounted devices connect to the target computing device
with the help of Bluetooth wireless networking technology. The user can
type on a hard surface like a desk or table, or into the air. The hand-mounts
measure finger movements and tell the handheld what keys the user intends
to press, based on the ubiquitous QWERTY keyboard layout. There's also a
pause function.
Sensors made of a combination of rubber and plastic are attached to
the user's palms in such a way that they do not interfere with finger
motions. Through the use of Bluetooth technology, the "typed" information
is transferred wirelessly to the computer, where a word processing program
analyzes and interprets the signals into readable text.
The device is currently usable via existing ports on personal digital
assistants (PDAs) from Palm and other manufacturers. Senseboard officials
say it eventually will be compatible with most brands of pocket PCs,
mobile phones and laptop computers.
No visual mapping, recognition not recalls, easy to make errors.
Only for expert touch typists. Also the product requires specialized
software for handheld devices. For example, Senseboard software includes
a dictionary program that predicts words based on common grammatical
sentence structures to boost keying accuracy.
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SCURRY – THE SAMSUNG PRODUCT
Samsung's Scurry is also a wearable keyboard. It works by attaching
motion sensors to each finger. It doesn't detect muscle movement, but
rather uses gyroscopic technology to detect angular movements of fingers
through space. This approach works better: Demonstrations on the show
floor were far more impressive than its competitor's performance in terms
of accuracy. However the device is too bulky. Nonfunctional prototypes of
the final product are much smaller.
The model demonstrated is wired. The manufacturers say, by the time
their products become commercially available they will support the
wireless Bluetooth protocol. Also the product requires specialized software
for handheld devices.
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THE CANESTA KEYBOARD
In 1998 two inventors, Nazim Kareemi and Cyrus Bamji, struck up a
conversation with an informal gathering of alumni from the Massachusetts
Institute of Technology in Santa Clara, Calif. Bamji mentioned his concept
for controlling electronic devices from a distance--in essence, a new form
of remote control. "This idea was humming in my head for some time," he
says, "but it didn't gel."
Kareemi, an electrical engineer who had founded PenWare (now
owned by Symbol Technologies), a producer of machines that record
signatures electronically, took a pragmatic interest in the problem. His
experience in the technology business complemented Bamji's ongoing
supply of ideas, making the two an ideal team. For his part, Bamji is a jack-
of-all-trades and an expert at most. He earned a collection of degrees, from
math to computer science, plus a doctoral degree in electrical engineering
and computer science, from M.I.T. Then he worked as an architect of
electronic devices and systems at Cadence Design Systems in San Jose,
Calif.
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The two men followed up on their original discussion by starting to
think about developing a low-cost gadget that could make a three-
dimensional map of its surroundings. After pondering that problem for half
a year, they decided that an ideal application would be a virtual keyboard:
an image of "q," "w," "e," "r," "t," "y" and the other keys projected on a
desktop, where someone could press down fingers. The sequence of
keystrokes would be recorded by a nearby personal electronic device or a
cellular phone equipped to send electronic mail. The apparatus would
register which key had been pressed by using a three-dimensional depth
map, which provides information about where a particular key is located.
This invention was conceived early in 1999, but financial backing
for their brainchild did not come readily. "We presented the keyboard idea
to a couple of venture capitalists," Bamji says. "My recollection is that they
merely smiled." Yet Kareemi and Bamji believed in their invention, and by
April they and an engineer colleague, Abbas Rafii, launched a company
called Canesta, based in San Jose, Calif. (The company name is an acronym
made from the given names of the founders, plus a few added letters to give
it a ring.) They funded the company themselves for a year and then, in
2000, went after their initial round of venture capital and raised $3 million.
By that fall they had gone as far as to concoct a working version of the
keyboard.
To devise a way for electronics to see in three dimensions, the team
wanted to avoid mistakes made by others who had pursued similar
technologies. Earlier researchers who had attempted to create 3-D images
had relied on dual cameras and compared images pixel by pixel, a method
that demands considerable computer processing. "We took a step back,"
Bamji explains, "and tried to have a more holistic approach. We needed a
3-D sensor to get away from problems with interpreting light from dark."
Just such a sensing apparatus was incorporated in a product, the
Integrated Canesta Keyboard, and introduced in September at a mobile and DEPARTMENT OF ECE GEC THRISSUR
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wireless conference. The product became one of several virtual keyboards
that are entering the market.
The Integrated Canesta Keyboard is based on a controller and two
optical components that project the image of a keyboard onto any flat
surface and use a light source to track the movement of fingers on that
image. It uses the Electronic Perception Technology.
It is made up of three components.
· Pattern Projector
is used to project light onto a flat surface, forming a standard QWERTY
keyboard layout or a custom layout of your choosing.
· IR light source
Bathes the keyboard in an infrared light.
· Sensory module
Picks up finger movements over the keys.
The information picked up is formed into a 3D image with motion
and translated into standard keyboard input data. Canesta's advantage is the
fact that as far as the user is concerned there's no new hardware to buy or
install. But PDA manufacturers are under pressure to add a raft of new
features to their devices, all of which require extra components that take up
valuable space and add to the always sensitive bill of materials. Canesta's
advantage is the fact that as far as the user is concerned there's no new
hardware to buy or install. But PDA manufacturers are under pressure to
add a raft of new features to their devices, all of which require extra
components that take up valuable space and add to the always sensitive bill
of materials.
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TECHNOLOGY
Uses low-cost semiconductor-based sensors.
The resolution of the chip also was not disclosed, although
van Burden said that the sensor chip would recognize images up to
about 30 centimeters away from the camera, in a field of view about
the size of an airplane's seatback tray table. The chip can process up
to 50 frames per second of information, he said. Future versions of
the chip will improve the resolution of the device and the distance at
which it can distinguish objects, van Burden said.
Ideally, the chipset will reduce a PDA's battery life by about
ten percent, a target Spare said the company hasn't quite met.
However, Taiwan chip foundry UMC is fabricating the chipset on
0.25-micron silicon, leaving plenty of room for a power-reducing
process shrink. The pattern projector uses the most power, requiring
about 60 mW to operate and project the image. The company built in
power-saving modes into the chipset, set to wake up the device at the
wave of a finger.
The chipset simply outputs RS232 serial keystrokes, and
does not require a specific CPU, Spare said.
Tricky Placement: Size and proper orientation of the three
Canesta components is likely to be the biggest hurdle for handheld
system makers looking to use the technology. The 0.25-micron
sensor chip at the heart of the solution includes a barrel lens that
senses the light bouncing off a finger. The chip and lens together
measure 8 x 8 x 8 mm. The infrared light source is in a separate 6.4-DEPARTMENT OF ECE GEC THRISSUR
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mm diameter x 12-mm module. And the pattern projector measures
9 x 9 x 12 mm. All three devices need to point outward from the
system in a similar orientation — a tricky placement and integration
challenge for a PDA and one currently not feasible for the next-
generation of relatively thin 2.5G cell phones.
The company is already working on a so-called LP-2
version of the components that would shrink the controller module
to 6 x 6 x 6 mm and shave size off the optical components as well.
Machine Vision: According to van Burden, the EPT chip
includes finely tuned timing circuits that can be used to measure
each individual pixel's worth of reflected light, calculating the
distance of the object away from the camera. The reflected waves
can be used to reconstruct the image of the object, complete with
what van Burden called a "depth map" to extend the two-
dimensional image into the third dimension.
EPT, in fact, does not use visible light at all. Instead, a beam
of infrared light—similar to that emitted by the auto focus
mechanism of a camera—"paints" the object. The EPT sensor
receives the light and reconstructs the image using built-in software.
The EPT system consists of the infrared light source and a slightly
modified conventional CMOS imaging chip, similar to those used in
digital cameras. Canesta has built in the software inside the imaging
chip, eliminating the need for a separate microcontroller.
Total maximum power consumption for the three modules
currently stands at 105 mW.
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Canesta Keyboard™ Perception Chipset™
The Canesta Keyboard Perception Chipset is designed to meet the
stringent needs of manufacturers of portable devices. Their small size and
low power requirements make them ideally suited for integration into
portable devices such as cell phones, PDAs, and Tablet PCs. In addition,
each module is fully self-contained simplifying the process of integrating
them into an electronic device.
Canesta Keyboard Sensor Module
The Canesta Keyboard Sensor Module (SM-CK100) serves as the
eyes of the Canesta Keyboard Perception Chipset and features Canesta's
patent-pending electronic perception technology. It includes an integrated
lens that performs all necessary filtering and focusing functions, making it
easy to integrate the module into a final product. Working in conjunction
with the Canesta Keyboard Light Source, the SM-CK100 enables both
keyboard data input and mouse functionality without the confining
limitations of a physical form factor.
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The Canesta Keyboard Sensor Module operates by locating the user's
fingers in 3-D space and tracking the intended keystrokes. Tracking and
keystroke information is processed onboard the SM-CK100 without
assistance from the device processor. Keystroke information can then be
output to the device via an RS232 or USB interface.
Canesta Keyboard IR Light Source
The Canesta Keyboard Light Source (IR-CK100) plays a critical role
in any Canesta Keyboard Perception Chipset implementation by enabling
Canesta's patented electronic perception technology. The module collects
the IR laser diode and all the associated optics into a single concise
package, making it easy to integrate into a final product. The IR Light
Source operates by emitting a beam of infrared light. This light beam is
designed to overlap the area on which the Canesta Keyboard Pattern
Projector (PP-CK100) displays the keyboard layout so that the user's
fingers are illuminated by the infrared light beam. The Canesta Keyboard
Sensor Module (SM-CK100) detects the finger movement and the typing
activity is resolved into the appropriate keystrokes or mouse actions.
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Canesta Keyboard Pattern Projector
The Canesta
Keyboard Pattern Projector (PP-CK100) presents the image of the Canesta
Keyboard. The Projector features a wide-angle lens so that a large pattern
can be projected from the relatively low elevations associated with mobile
devices. When activated, the Pattern Projector displays a standard
QWERTY keyboard layout onto a flat surface such as a desk, or the side of
a briefcase. The projected keyboard image can then be used to enter data
into the device, such as a cell phone or a PDA, in an efficient and familiar
way.
The default projected keyboard pattern has been optimized to improve
typing accuracy and include shortcut keys for popular applications.
Interested manufacturers can have custom layouts incorporated into the
Canesta Keyboard Pattern Projector to meet the unique needs of their target
market. To further improve usability, the Canesta Pattern Projector features
adjustable brightness levels so that both manufacturers and end users can
configure the Pattern Projector to best meet the unique requirements of the
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VKEY – FROM VIRTUAL DEVICES
Pennsylvania-BASED virtual Devices has introduced a
revolutionary keyboard, called the Vkey, for next-generation handheld
devices. The ides behind the camera is use of an infrared camera that
projects the picture of a keyboard on a surface while the camera tracks the
movement of our fingers on the surface and structured light to interpret and
analyse keystrokes and mouse functions, enabling us to compose e-mails or
interact with wordprocessors and spreadsheets.
The keyboard translates finger movements to keystrokes with a high
degree of precision and may be a viable replacement for standard
keyboards. The technology will let businessmen carry a fully functional
computer in their pockets.
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Virtual Devices (VDI) is not only looking at the PDA market,
however - they also want to try and crack the wireless desktop workstation
market, as well as the cellular market, which has experienced a phenomenal
boom in short message services (sms). It also has potential in the wearable
personal computer market (which so far has proved a huge disappointment,
mainly because no one wants to become the ultimate geek by actually
wearing their computer - do they?), as well as for industrial applications
like ATM machines and pay telephones. "VDI believes that the virtual
keyboard is the last piece in the evolving convergence of personal
computers, mobile phones, personal digital assistants (PDAs), and the
internet.
VIRTUAL KEYBOARD FROM VKB
A full-size fully functional virtual keyboard that can be projected and
touchedon any surface is shown by Siemens Procurement Logistics
Services at the CeBIT fair in Hanover, northern Germany, on Monday,
March 18, 2002. The virtual interface from Developer VKB Inc. from
Jerusalem in Israel can be integrated in mobile phones, laptops, tablet PCs,
or clean, sterile and medical environments and could be a revolution for the
data entry of any mini computer. The mini projector that detects user
interaction with the surface also simulates a mousepad.
VKB has developed a highly efficient method for projecting an optical
image of a keyboard onto a surface. In addition, VKB has developed a
detection method through several proprietary developments for the accurate
and reliable detection of user interaction, such as typing or cursor control
functions (e.g. mouse or touch-pad controls). VKB has resolved all the
technological hurdles required to make a practical virtual interface. Include
minimizing the power consumption, minimal component size, simple
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processing, high accuracy and ease of use. VKB has filed numerous patents
on its core technology and related applications.
NO-KEYS -- THE SOFTWARE
No-Keys is a computer software program that displays a picture of a
computer keyboard on the screen. Users can "type" on this virtual keyboard
using a mouse, trackball, or similar pointing device. (A scan option is also
provided for people who cannot move any pointing device at all.) Whatever
keys are typed on the virtual keyboard are sent to another program (such as
a word processor, email program, text-to-speech program, etc.) selected by
the user. This allows you to operate the computer entirely with the mouse
or other pointing device. This is intended primarily for computer users who
have limited mobility, such as people suffering from MD, MS, stroke, or
similar handicaps or disabilities. It can also be used for touch screen
computers to eliminate the need for the keyboard.
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The current version is version 5.0. This is a new and improved
version that allows the user to create custom keyboard configurations. You
can now put exactly the keys you want on the keyboard in whatever order
and arrangement you want.
The program is distributed as shareware. This means that you can
download the program and use it for 60 days without paying for it. If you
decide you want to continue using the program after 60 days, you must pay
the $30 registration fee.
CLICK-N-TYPE KEYBOARD
Click-N-Type is an on-screen virtual keyboard designed for anyone
with a disability that prevents him or her from typing on a physical
computer keyboard. As long as the person can control a mouse, trackball or
other pointing device, he or she can send keystrokes to virtually any
Windows application or DOS application that can run within a window.
Click-N-Type is a 32 bit application that requires Windows
95/98/Me/NT/2000/XP or later. There are other virtual keyboards around
but you'll find Click-N-Type the easiest to use for getting text into those
uncooperative places like browser URL "Address:" fields, Email "To:"
addresses, Email "Subject:" fields, dialog boxes like "Open" and "Save
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As...", and many other problematic applications. You'll see they all work
fine while typing into Notepad or WordPad, but when you attempt to do
some real work, you'll get really annoyed really fast. Click-N-Type was
designed with ease of use foremost in mind.
The basic Click-N-Type keyboard could be completely visible on a
screen of any size or resolution. The Click-N-Type window is fully
resizable to our needs and can be repositioned to any place on our screen.
There are many options to modify its appearance. For example, the Speed
Keyboard option changes the alphabetic key layout based on the frequency
of letter usage in the English language. This keeps our mouse movement to
a minimum and speeds up typing. We can also customize our alphabet to
fit our needs. For more specialized needs, we can even build our own
keyboard. Of course, when not in use Click-N-Type may be minimized so
it's out of our way.
APPLICATIONS
Writing sentences on PDAs still requires a lot of patience and
practice. Some older models require people to enter data with a proprietary
scrawl, while newer models use tiny keyboards that require dexterous,
strong thumbs. And full-size keyboards just don't go well with the latest
svelte devices. Even though these (handheld) devices are capable of
sophisticated applications there's really no way to reasonably use those
applications, especially those that require entering data, like e-mail.
Virtual keyboards project an image of a full-size keyboard on any
flat surface. It also emits an infrared beam that detects the position and
motion of a typist's hands. Tapping on the image of a key produces the
corresponding character on the device.
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In addition to small devices projection keyboards could be used to
create a control-panel projection that offers virtual knobs and switches for
use in hazardous environments, as well as in medical markets where sterile
data entry is a concern.Even though PDAs have capabilities like word
processing and spreadsheets, they’re generally not utilized because they
lack a practical keyboard. Virtual Keyboard provides a full-size computer
keyboard that disappears when not in use.
The keyboard will be convenient for people who travel so they can
easily access information through web pages. So when designing pages, it
will be important to make sure the pages include complete and updated
information.
This keyboard will be efficient for individuals that have physical
disabilities. This technology will provide a keyboard that does not require
force to activate the keys.Since a virtual keyboard does not violate the
sterile environment, this has wide applications in the medical field.
Moreover the technology will cause our laptops and palmhelds to shrink to
pocket computers.
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CONCLUSION
Writing sentences on PDAs still requires a lot of patience and
practice. Some older models require people to enter data with a proprietary
scrawl, while newer models use tiny keyboards that require dexterous,
strong thumbs. And full-size keyboards just don't go well with the latest
svelte devices.
Virtual keyboards are projected images of the real thing that let
typists compose their sentences on any flat surface. They are inching closer
to store shelves. The keyboard will be convenient for people who travel so
they can easily access information through web pages. This will be efficient
for individuals that have physical disabilities. This technology will provide
a keyboard that does not require force to activate the keys. It will serve
disabled people better. Virtual keyboard is the last piece in the evolving
convergence of personal computers, mobile phones, personal digital
assistants (PDAs), and the internet. Hope soon the time will arrive when
the laptops shrink more to pocket devices and the now available pocket
devices still smaller.
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Appendix I
Smart phone
The term smart phone is sometimes used to characterize a wireless
telephone set with special computer-enabled features not previously
associated with telephones.
In addition to functioning as an ordinary telephone, a smartphone's features
may include:
Wireless e-mail, Internet, Web browsing, and fax
Intercom function
Personal information management
Online banking
LAN connectivity
Graffiti style data entry
Local data transfer between phone set and computers
Remote data transfer between phone set and computers
Remote control of computers
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Remote control of home or business electronic systems
Wearable computers
Some inventors and other theorists not only believe you could wear a
computer; they believe there's no reason why you shouldn't. Assuming you
remembered to wear it, a wearable computer is always available. Currently,
several companies sell wearables and there is a considerable literature on
the subject. Some wearable computers are basically desktop or notebook
computers that have been scaled down for body-wear. Others employ brand
new technology. Both general and special purposes are envisioned. A
number of wearables have been designed for the disabled.
Among the challenges of wearable computers are: how to minimize
their weight and bulkiness, how and where to locate the display, and what
kind of data entry device to provide. Some of the applications envisioned
for wearable computers include:
Augmented memory, a concept originated by Thad Starner and being
developed by Bradley Rhodes at the MIT Media Lab, in which as you enter
a room, your wearable computer could sense the people present and remind
you of their names or personal history, or a scheduler could whisper the
time of an important meeting in your ear, or a "remembrance agent" could
look for related documents by observing the words you were typing
Immediate access to important data for anyone whose occupation
requires mobility, such as real estate agents, rural doctors, fire and police
professionals, lawyers in courtrooms, horse bettors, military personnel,
stock brokers, and many others
The ability to take notes immediately. For example, for reporters,
geologists, botanists, vendor show representatives, field service repair
personnel.
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In Web page development, an image map is a graphic image defined
so that a user can click on different areas of the image and be linked to
different destinations. You make an image map by defining each of the
sensitive areas in terms of their x and y coordinates (that is, a certain
horizontal distance and a certain vertical distance from the left-hand corner
of the image). With each set of coordinates, you specify a Uniform
Resource Locator or Web address that will be linked to when the user clicks
on that area.
The X and Y coordinates are expressed in pixels either in a separate file
called a map file or in the same HTML file that contains the link to the
image map. Popular tools like MapEdit provide a graphical interface for
creating an image map (so that you don't have to figure out the X and Y
coordinate numbers yourself).
Originally, the map file had to be sent to the server. Now the creator
can place the map information either at the server or at the client (a "client-
side map"). Image maps are used widely on many Web sites as a more
adventuresome form of main menu.
TouchScreen
A touch screen is a computer display screen that is sensitive to
human touch, allowing a user to interact with the computer by touching
pictures or words on the screen. Touch screens are used with information
kiosks, computer-based training devices, and systems designed to help
individuals who have difficulty manipulating a mouse or keyboard. Touch
screen technology can be used as an alternative user interface with
applications that normally require a mouse, such as a Web browser. Some
applications are designed specifically for touch screen technology, often
having larger icons and links than the typical PC application. Monitors are
available with built-in touch screen technology or individuals can purchase
a touch screen kit.
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A touch screen kit includes a touch screen panel, a controller, and a
software driver. The touch screen panel is a clear panel attached externally
to the monitor that plugs into a serial or Universal Serial Bus (USB) port or
a bus card installed inside the computer. The touch screen panel registers
touch events and passes these signals to the controller. The controller then
processes the signals and sends the data to the processor. The software
driver translates touch events into mouse events. Drivers can be provided
for both Windows and Macintosh operating systems. Internal touch screen
kits are available but require professional installation because they must be
installed inside the monitor.
There are three types of touch screen technology:
Resistive: A resistive touch screen panel is coated with a thin metallic
electrically conductive and resistive layer that causes a change in the
electrical current which is registered as a touch event and sent to the
controller for processing. Resistive touch screen panels are generally more
affordable but offer only 75% clarity and the layer can be damaged by
sharp objects. Resistive touch screen panels are not affected by outside
elements such as dust or water.
Surface wave: Surface wave technology uses ultrasonic waves that pass
over the touch screen panel. When the panel is touched, a portion of the
wave is absorbed. This change in the ultrasonic waves registers the position
of the touch event and sends this information to the controller for
processing. Surface wave touch screen panels are the most advanced of the
three types, but they can be damaged by outside elements.
Capacitive: A capacitive touch screen panel is coated with a material that
stores electrical charges. When the panel is touched, a small amount of
charge is drawn to the point of contact. Circuits located at each corner of
the panel measure the charge and send the information to the controller for
processing. Capacitive touch screen panels must be touched with a finger
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unlike resistive and surface wave panels that can use fingers and stylus.
Capacitive touch screens are not affected by outside elements and have high
clarity.
Sensor Chips
Most people understand that light takes a finite time to travel between
two points -- that photons of light from two different stars, for example,
may have started their journeys years, or even millennia apart. Since light
travels essentially at a constant speed, if you know the time, you can
calculate the distance.
The light illuminating each individual pixel in an image sensor comes
from a different feature in the scene being viewed. Canesta recognized that
if you could determine the amount of time that light takes to reach each
pixel, you then could calculate with certainty the exact distance to that
feature. In other words, you could develop a three-dimensional "relief" map
of the surfaces in the scene. In three dimensions, objects previously
indistinguishable from the background, for example, metaphorically "pop"
out. For a broad class of applications, this proves extremely helpful in
reducing the mathematical and physical complexity that has plagued
computer vision applications from the start.
In a recently-granted U.S. patent, Canesta describes several of its
inventions for "timing" the travel time of light to a unique, new class of
low-cost sensor chips.
Fundamentally, the chips work in a manner similar to radar, where the
distance to remote objects is calculated by measuring the time it takes an
electronic burst of radio waves to make the round trip from a transmitting
antenna to a reflective object (like a metal airplane) and back. In the case of
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The chips, which are not fooled by ambient light, either then time the
duration it takes the pulse to reflect back to each pixel, using high speed,
on-chip timers, in one method, or simply count the number of returning
photons -- an indirect measure of the distance, in another.
In either case, the result is an array of "distances" that provides a
mathematically accurate, dynamic "relief" map of the surfaces being
imaged. The image and distance information is then handed off to an on-
chip processor running Canesta's proprietary imaging software that further
refines the 3-D representation before sending it off chip to the OEM
application.
Image Precessing Software
The second component of Canesta's electronic perception technology
is a robust body of new, "industrial grade" software designed for real-world
applications.
Since Canesta's software starts with a three-dimensional view of the
world, provided "for free" by the hardware, it has a substantial advantage
over classical image processing software that struggles to construct three-
dimensional representations using complex mathematics, and using images
from multiple cameras or points of view. This significant reduction in
complexity makes it possible to embed the application-independent portion
of the processing software directly into the chips themselves so they may be
used in the most modestly-priced, and even pocket-sized, electronic
devices. In addition, it accounts for the remarkable ability of the technology
to compute 3-dimensional image maps at more than 50 frames per second;
remarkable compared to existing technology that can take from several
seconds to several minutes to generate a 3-dimensional representation of a
single, static frame.
Finally, with an expectation of its use not only in mission critical
applications such as medical instrumentation, automotive, or security, but
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in the notoriously unforgiving consumer products arena, Canesta's software
features tolerant, self calibrating algorithms, and is built using a layered
software model that features compact code, for ease of embedding in
modest applications.
Although the foregoing discussion has focused on two specific electronic
perception chip designs, Canesta, with over 20 hardware and software
patents filed, and with more on the way, has substantial research and
development initiatives underway that will result in future technology
disclosures, product announcements, and strategic alliances well beyond
what is discussed here.
Electronic Perception Technology
Electronic perception technology permits machines, consumer and
electronic devices, or virtually any other class of modern product to
perceive and react to objects and individuals in the nearby environment in
real time, particularly through the medium of "sight," utilizing low-cost,
high-performance, embedded sensors and software. What sets electronic
perception technology apart from classical "computer vision" applications,
is that for the first time, actionable information can be developed in real
time by observation of the nearby environment utilizing an ultra-low-cost
sensor technology that is a size comparable to that found in nature. And as
portable. The goal of electronic perception technology is to make it
possible for devices or applications of any complexity, from "lightweight"
appliances, PDAs, cell phones, or games, to heavyweight vehicle control,
airport security, or national security-class applications, to be able to
perceive objects and features in the nearby environment such that
identification and action are practical and possible.///Canesta has taken a
leadership role in defining and implementing practical electronic perception
technology with the development of low-cost, semiconductor-based image
sensor chip technology and powerful embedded image processing software.
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Canesta's technology provides actionable perceptions or identifications to
third-party applications that permit these applications embedding Canesta's
technology to react in a manner appropriate to their function.
REFERENCE
Websites :
www.pcworld.com
www.senseboard.com
www.canesta.com
www.ananova.com
www.virtual-keyboard.com
www.lakefolks.com
www.time.com
Other References :
Electronics for you
Scientific American
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