07-04-2011, 04:33 PM
PRESENTATION_VIRTUAL_KEYBORD.ppt (Size: 2.87 MB / Downloads: 275)
INTRODUCTION
• Virtual Keyboard is just another example of today’s computer trend of ‘smaller and faster’.
• Many alternate forms like speech recognition, hand writing recognition devices had come.
• The new virtual keyboard technology uses sensor technology and artificial intelligence to let users work on any surface as if it were a keyboard.
• The software and hardware part recognizes the typed characters and pass it to the computer.
• Virtual Keyboard, being a small, handy, well-designed and easy to use application, turns into a perfect solution for cross platform multilingual text input.
QWERTY KEYBOARDS
• QWERTY is the most common keyboard layout on English-language computer and typewriter keyboards.
• INSIDE THE KEYBOARD
• 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.
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.
• Virtual Devices have developed a flashlight-size gadget that projects an image of a keyboard on any surface and let’s people input data by typing on the image.
• 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 .
VIRTUAL KEYBOARD TECHNOLOGY
• This system comprises of three modules:
• 1. The sensor module
• 2. IR-light source and
• 3. The pattern projector .
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, or mouse movements.
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 .
The pattern projector:
• The Pattern Projector or optional printed image presents the image of the keyboard or mouse zone of the system.
• 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.
VIRTUAL DEVICES
• For some input devices there is a complimentary form where they can also be displays. This is called input-output duality.
• Input/output duality is accomplished by designing two separate technologies into one integrated package.
• Recently a new class of device has started to emerge which is conceptually rooted in exploiting this input/output duality. They can be called Projection/Vision systems, and/or Projection/Scanning or Projection/Camera technologies.
HOW DOES IT WORKS
Projection Module – A template is created of the desired interface and is projected onto the adjacent interface surface. This template is produced by illuminating a specially designed highly efficient holographic optical element with a red diode laser.
Micro-illumination Module – An infa-red plane of light is generated just above, and parallel to the interface surface. This light is invisible to the user and hovers a few millimeters above the surface.
Sensor Module – Reflected light from user interactions with the interface surface is passed through an infa-red filter and imaged onto a CMOS image sensor in the sensor module.
DIFFERENT VIRTUAL KEYBOARDS
• There are different types of virtual keyboards, manufactured by various companies which provide different levels of functionalities .
• The different types of virtual keyboards are:
• Developer VKBä
• Canestaä
• Sense board Technologies
• KITTYä
• InFocusä
Developer VKBä
• Siemens Procurement Logistics Services Rechargeable batteries similar to those in cell phones.
As a Class 1 laser, the output power is below the level at which eye injury can occur.
Canestaä
• In the Canesta Keyboard the same laser is also used to scan the projection field and extract 3D data.
• They also have a chip set, Electronic Perception Technology, which they supply for 3rd parties to develop products using the projection/scanning technology.
Sense board Technologies
• Here the image is not projected on to any surface.
• The Senseboard SB 04 technology is an extreme case of a hybrid approach. The sensing transducer is neither a laser scanner nor a camera. Rather, it is a bracelet-like transducer that is worn on the hands which captures hand and finger motion.
• 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.
KITTYä
• KITTY, an acronym for Keyboard-Independent Touch-Typing, is a Finger mounted keyboard that uses touch typing as a method of data entry.
InFocusä
• They do not use laser technology. This has that advantage of delivering high quality color images with a mature technology like video camera.
• It has the disadvantage of larger size, lower contrast, and higher power requirements, compared to laser projection systems.
ADVANTAGES
• It can be projected on any surface or you can type in the plain air.
• It can be usefull in places like operation theaters where low noise is essential.
• The typing does not require a lot of force. So easing the strain on wrists and digits.
• The Virtual Keyboard is not restricted to the QWERTY touch-typing paradigm, adjustments can be done to the software to fit other touch-typing paradigms as well.
ADVANTAGES
• No driver software necessary, It can be used as a plug and play device.
• High battery life. The standard coin-sized lithium battery lasts about eight months before needing to be replaced.
DRAWBACKS
• 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.]
• It is very costly ranging from 150 to 200 dollars.
• The room in which the projected keyboard is used should not be very bright so that the keyboard is properly visible.
APPLICATIONS
• High-tech and industrial Sectors.
• Used with Smart phones, PDAs, email, word processing and spreadsheet tasks.
• As computer/PDA input.
• Gaming control.
• TV remote control
CONCLUSION
• Projection key boards or virtual key boards claim to provide the convenience of compactness with the advantages of a full-blown QWERTY keyboard. The company's Virtual Keyboard is designed for anyone who's become frustrated with trying to put information into a handheld but doesn't want to carry a notebook computer around.
• Canesta appears to be the most advanced in this class of technology and the only one who is shipping product. Other products are KITTY, a finger-mounted keyboard for data entry into PDA's, Pocket PC's and Wearable Computers and KITTY, a finger-mounted keyboard for data entry into PDA's, Pocket PC's and Wearable Computers.
• Thus virtual keyboards will make typing easier, faster, and almost a pleasure.