Wi vi presentation


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Wi vi presentation

  1. 1. WI-VI (Wireless Vision) Guided by Prof. M. L. Patel Presented by Vikas Shantaram Malvekar R. C. Patel Institute of Technology
  2. 2. History of WI-VI. Introduction. Operating principle. RADAR and SONAR imaging. Development. Futuristic uses. contents
  3. 3. Researchers at MIT's Computer Science and Artificial Intelligence Laboratory. Dina Katabi , a professor in MIT’s Department of Electrical Engineering and Computer Science, and her graduate student Fadel Adib. history
  4. 4. Previous attempts to track moving targets through walls have done so using an array of spaced antennas. Each capture the signal reflected off a person moving through the environment. This would be too expensive and bulky for use in a handheld device. So instead Wi-Vi uses just one receiver. introduction
  5. 5. Based on the principle of RADAR and SONAR imaging. WI-VI is potentially an X-RAY vision created with low power Wi-Fi signals. This tech uses reflected Wi-Fi signals to track the movement of people behind walls. See through movement behind walls. basic working
  6. 6. RADAR and SONAR work on the Doppler effect. RADAR is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. Depends on its own transmitted signal. principle
  7. 7.  Wi-Vi relies on a simple hardware of 2.4 GHz Wi-Fi radios.  Wi-Fi signals easily penetrate through walls.  Small enough to be portably used.  Integrated in hand held devices.
  8. 8. WI-VI uses two transmitting antennas and a single receiver. Transmitting signals are low power Wi-Fi signals. The two antennas transmit almost identical signals, except the second antenna's signal is the inverse of the first, resulting in interference. How it works?
  9. 9. 180˚ inverse ROUTER 1 ROUTER2 obstacle DIRECTION OF SIGNAL RECIEVER
  10. 10.  Any static objects that the signals hit including the wall create identical reflections, they too are cancelled out by this nulling effect.  Only those reflections that change between the two signals, such as those from a moving object, arrive back at the reciever.
  11. 11. WI-VI setup
  12. 12.  As the person moves through the room, his or her distance from the receiver changes, meaning the time it takes for the reflected signal to make its way back to the receiver changes.  The system then uses this information to calculate where the person is at any one time.
  13. 13. All reflections from static objects are cancelled out, and the only thing registered by the device is the moving human.
  14. 14. Wi-Vi delivers a more basic perspective on moving objects. Relatively low resolution compared to a traditional camera. Wi-Vi delivers a more basic perspective on moving objects. “Simple gestures” are also traceable. resolution
  15. 15. Possible use in smart phones as a hand held WI-VI device. Monitoring situations in hospitals or a conspired heist. Disaster recovery. Gaming. applications
  16. 16. Smart hand held device which gives an insight vision through walls. Could prove to be very powerful and effective device for defence purposes. Possibly the next generation RADAR. conclusion
  17. 17. www.mit.com www.cnet.com www.gizmag.com www.techhive.com references
  18. 18. THANK YOU!