Virtual keyboard

virtual keyboard ppt

1. C . Sri Sudheera

2. Contents: Introduction Definition Virtual Keyboard Features Virtual keyboard Technology Working Mechanism Advantages Disadvantages Conclusion References

3. Introduction: The aim of this technology is to develop an “Augmented Reality” solution for a handheld device that enables the user to write text. The first virtual keyboard was invented by IBM in 1992 Virtual keyboard

4. Definition: A virtual keyboard is a software component that allows a user to enter characters. A virtual keyboard can usually be operated with multiple input devices, which may include a touch screen, an actual computer keyboard . Virtual keyboard is also called as projection keyboard. Virtual keyboard with screen

5. Virtual keyboard Features: Most of the projection keyboards use a red diode laser as a light source. Virtual keyboard size is usually 295mm*95mm. Virtual keyboard can be connected by using either by USB ports or Bluetooth. Virtual keyboard works on lithium ion batteries. Virtual keyboard capacity is 120 minutes of continuous typing.

6. Virtual keyboard technology: This system comprises three modules :- The sensor module IR light source The patter projector

7. Sensor Module : Operates by locating the users fingers in 3 –D space and tracking the intended keystrokes. IR Light Source : It emits a beam of infrared light helps in recognizing hand movements and the pressing of the keys.

8. iii. Pattern Projector : Image can be projected on flat surface. The projected image is that of standard QWERTY keyboard, with all the keys and control functions as in keyboard. The pattern projector or optional printer image presents the image of the keyboard by the system.

9. 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.

10. 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.

11. Advantages: Portability. Speed of text accuracy. Alternative keyboard layouts. Flexibility. Lack of need flat or large typing space.

12. Disadvantages: Poor video output quality is less than expected. Unusable virtual keyboard in portrait mode. Relatively poor battery life. The keyboard utility depends on the surface on which it is located. virtual keyboard is very costly ranging from 150 to 200 dollars

13. Conclusion: Projection key boards or virtual key boards claim to provide the convenience of compactness with the advantages of a full-blown QWERTY keyboard. A virtual keyboard based on 3-D optical range camera. Virtual Keyboard is also used in 6 th sense technology device in which it is not depends on surface. the feedback text and/or graphics may be integrated with such projector, thus enabling truly virtual working area. Thus virtual keyboards will make typing easier, faster, and almost a pleasure.

14. http://en.wikipedia.org/wiki/Virtual_keyboard http://www.dfrobot.com/wiki/index.php/Laser_Keyboard_Kit_(SKU:KIT0030) http://www.ehow.com/list_5772511_advantages-virtual-laser-keyboard.html http://en.wikipedia.org/wiki/Projection_keyboard#Interpretation_and_communication_.28Sensor_module.29 http://en.wikipedia.org/wiki/Projection_keyboard https://www.google.co.in/search?q=virtual+keyboard+images&biw=800&bih=509&tbm=isch&tbo=u&source=univ&sa=X&ei=PhsuVIugOY-hugSxpoGQBA&ved=0CBsQsAQ References: