Virtual keyboard abstract
Download as DOCX, PDF0 likes315 views
This document discusses virtual keyboards as an alternative input method for small devices. A virtual keyboard uses a laser projection system to project the image of a keyboard onto any flat surface. It allows touch-typing without the need for physical keys. The system works by using infrared sensors to detect finger positions and track keystrokes on the projected keyboard interface. While offering portability and flexibility over physical keyboards, virtual keyboards also have disadvantages like poor battery life and video quality issues. The document explores the technology and components of virtual keyboard systems.
Virtual keyboard abstract
- 1. VIRTUAL KEYBOARD C.SRI SUDHEERA (13891A0414) DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING VIGNANINSTITUTE OF TECHNOLOGYAND SCIENCE csrisudheera@gmail.com ABSTRACT Input to small devices is becoming an increasingly crucial factor in development for the ever-more powerful embedded market. Speech input promises to become a feasible alternative to tiny keypads, yet its limited reliability, robustness, and flexibility render it unsuitable for certain tasks and/or environments. This paper surveys technology for alphanumeric input devices using virtual keyboard projection with a strong focus on touch-typing. KEYWORDS: sensors, QWERTY keyboard, pattern projector . Virtual keyboard Introduction: Virtual keyboardisjustanother example of today’scomputertrendof ‘smaller and faster’.Computingisnownotlimitedto desktopsandlaptops,ithasfoundwayinto mobile devicealso.Butwhatisnot changedis the inputdevice,the good oldQWERTY keyboard.The virtual keyboardtechnologyisa tabletopunitthatprojectsa laserimage of a keyboardonany flatsurface.Theyare not the electronicdevicetheyare justthe setof lights that looklikesthe keyboardandworkslike a keyboard.Inthistechnique we use adevice that producesthe LASER lightonthe flatsurface. ThisLASER lightproducedisthe keyboard.It createsdetectable surface onwhichuserdon’t needtopressthe keylike normal keyboard, whena usertouchesthe surface coveredbyan image of a key,the device recordsthe correspondingkeystroke. The aimof this technology istodevelopan“Augmented Reality”solutionforahandhelddevice that enablesthe usertowrite text. The firstvirtual keyboardwasinventedbyIBMin1992. People withbiggerfingersmayfindthe keyboardson smart phonesandPDAstoo small.Tomake up for this,some manufactureshave developed special virtual laserkeyboardsto accompany handhelddevices.Insteadof havingtopoke lightlyaroundyourphone'skeyboard,avirtual laserkeyboardconnectstothe phone and projectsa full-sizedvirtual keyboardontoany flatsurface. Definition: A virtual keyboard isa software componentthatallowsauser toenter characters.A virtual keyboard can usuallybe operatedwithmultiple inputdevices,which may include atouch screen,an actual computerkeyboard anda computermouse. Virtual keyboardis alsocalledasprojection keyboard. The laserkeyboard projection isa sort of an image of real keyboardbutwhich doesnotreallyexistphysically.
- 2. Virtual keyboard features:Most of the projectionkeyboardsuse areddiodeslaserasa lightsource andmay projecta full size QWERTY layoutkeyboard.The projectionkeyboardsizeis usually295mm*95mm andit isprojectedata distance 60mm fromthe virtual keyboardunit. The projectionkeyboardmaydetectupto400 characters perminute andit maybe connected by usingeitherby USB portsor Bluetooth.And it worksonlithiumionbatteriesandithasa capacityof at least120 minutesof continuous typing.Projectionunitsizevariesnotbigger than 35mm*92mm*25mm. Virtual keyboard technology: Thissystem comprisesthree modules :- 1. The sensormodule 2 .IR lightsource 3. The patterprojector 1. Sensor Module: Operates by locating user fingers in 3 –D space and tracking the intended keystrokes. 2. IR Light Source: It emits a beam of infrared lighthelpsinrecognizing hand movements and pressing of the keys. 3. PatternProjector: Image can be projectedon flat surface. The projected image is that of standard QWERTY keyboard,withall the keys and control functions as in keyboard. The pattern projector or optional printer image presents the image of the keyboard by the system. Working mechanism: The keyboard pattern projection displays a virtual keyboard pattern on a flat surface as a desktop surface. When user touches the key the top of finger will be illuminated by the lighting plane created by linear laser.
- 3. Infrared light cam captures the images of the illuminated fingers and send the image to the signal processing software. The position of illuminated finger is detected and localized by the software, and it will be related key input events. Advantages: a. Portability. b. Speed of text accuracy. c. Alternative keyboard layouts. d. Flexibility. e. Lack of need flat or large typing space. Disadvantages: a. Poor video output quality is less than expected. b. Unusable virtual keyboard in portrait mode. c. Relatively poor battery life. d. The keyboard utility depends on the surface on which it is located. e. It is very costly ranging from 150 to 200 dollars. Conclusion:Projectionkeyboardsorvirtual keyboardsclaimto provide the convenience of compactnesswiththe advantagesof a full- blownQWERTY keyboard.A virtual keyboard basedon 3-D optical range camera. Virtual Keyboardisalsousedin6th sense technology device inwhichitisnot dependsonsurface.the feedbacktextand/orgraphicsmaybe integratedwithsuchprojector,thusenabling trulyvirtual workingarea. Thusvirtual keyboardswill make typingeasier,faster,and almosta pleasure. References: http://en.wikipedia.org/wiki/Virtual_keyboar d http://www.dfrobot.com/wiki/index.php/ Laser_Keyboard_Kit_(SKU:KIT0030) http://www.ehow.com/list_5772511_adva ntages-virtual-laser-keyboard.html http://en.wikipedia.org/wiki/Projection_k eyboard#Interpretation_and_communicati on_.28Sensor_module.29 http://en.wikipedia.org/wiki/Projection_k eyboard https://www.google.co.in/search?q=virtua l+keyboard+images&biw=800&bih=509&tb m=isch&tbo=u&source=univ&sa=X&ei=Phs uVIugOY-hugSxpoGQBA&ved=0CBsQsAQ