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Virtual keyboard


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Virtual keyboard

  1. 1. Presented By:- X Y z Seminar on Virtual Keyboard Technology
  2. 2. Introduction Qwerty keyboard Virtual keyboard Modules of Virtual keyboard System Architecture Advantages Drawbacks Applications Conclusion References
  3. 3. Introduction The aim of this technology is to develop an “Augmented Reality” (AR) solution for a handheld device that enables the user to write text. A virtual keyboard is actually a key-in device, roughly a size of a fountain pen & which uses highly advanced laser technology. In a virtual keyboard, camera tracks the finger movements of the typist to get the correct keystroke. The software and hardware part recognizes the typed characters and pass it to the computer. The main features are: platform independent multilingual support for keyboard text input, built-in language layout and setting, copy/paste etc.
  4. 4.  QWERTY is the most common keyboard layout on English-language computer and typewriter keyboards.  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 Qwerty keyboard
  5. 5. The microprocessor and controller circuitry of a keyboard A look at the key matrix
  6. 6. 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.  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.
  7. 7. Virtual keyboard used in PDA’s  A virtual keyboard is a keyboard that a user operates by typing on or within a wireless or optical-detectable surface or area rather than by depressing physical keys.  The Virtual Keyboard uses light to project a full-sized computer keyboard onto almost any surface, and disappears when not in use.  A virtual keyboard makes it possible for the user of a very small smart phone or a wearable computer to have full keyboard capability. 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 .
  8. 8. Modules of Virtual Keyboard The Virtual Keyboard system comprises of three modules:-  The sensor module  IR-light source  The pattern projector
  9. 9. 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. Keystroke information processes and can then be output to host devices.
  10. 10. 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 .
  11. 11. Pattern projector: The Pattern Projector or optional printed image presents the image of the keyboard 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.
  12. 12. System Architecture This Fig. shows the physical setup of the system:-  The 3D range camera is placed several cms over the input surface, with a well-defined angle facing the working area.  The size of the working area, limited by the spatial resolution of the camera, is 15 cm 25 cm, which is comparable to a full-size laptop-computer keyboard. Virtual-keyboard demonstration-system setup The display projector is mounted on the camera, facing the same area, which would generate the visual feedback for the keyboard and input information.
  13. 13. Working layout of a Virtual Keyboard:-
  14. 14. Advantages  Portability  Accuracy  Speed of text entry  Lack of need for flat or large typing surface  Ability to minimize the risk for repetitive strain injuries.  No driver software necessary, It can be used as a plug and play device.
  15. 15. Drawbacks  It is very costly.  The room in which the virtual keyboard is used should not be very bright so that the keyboard is properly visible.  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.
  16. 16. Applications  High-tech and industrial Sectors.  Used with Smart phones, PDAs, email, word processing and spreadsheet tasks.  As computer/PDA input.  Gaming control.
  17. 17. Conclusion  A virtual key boards claim to provide the convenience of compactness with the advantages of a QWERTY keyboard.  A Virtual keyboard system based on a true-3D optical range camera.  It is also used in 6th 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.
  18. 18. References       