This presentation is related to wireless vision technology which is the invented by MIT

1. WI-VI
(WirelessVision)
Presented by
RAJAT BANSAL
IIITU14204

2. Contents
History
Introduction
Basic Idea
Challenges faced in designing WI-VI
 Flash Effect
 Tracking Human Movement
MIMO NULLING method
How it Works
Tracking Moving object
Advantage And Limitation
Applications

3. History
This Research is invented 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 invented this
technology.

4. Introduction toWI-VI
WI-VI stands for WIFI-VISION
Wireless Device
Capture moving objects behind the walls
Use Wi-Fi signals in ISM band(2.4 GHz)
Requires a Wi-Fi Hardware
3 Antenna MIMO device(Two Transmitter antenna and one receiver antenna)

5. BASIC IDEA
Wi-Vi
Device
wall Moving
object
Transmitted
signal reflected signal

6. Challenge Faced inWI-VI
Flash Effect

7. Identifying andTracking Humans

8. MIMO NULLING CONCEPT
To Eliminate the FLASH EFFECT we use MIMO NULLING CONCEPT
h2
h1
px
X
Y=h1x+ph2x
Static objects(Walls , chair etc.)
P=-h1/h2
Y=h1x+(-h1/h2)h2x=ZERO
Moving Objects
Y=h1x+ph2x=NOT ZERO

9. HowTechnology work
ROUTER 1 ROUTER2
MOVING OBJECT
RECEIVER

10. WIVI SETUP

11. Tracking moving object

12. Advantages
Wi-Vi is relatively a low-power, low-cost, low-bandwidth, and low-size
Wi-Vi requires only few MHz of bandwidth and operates in the same range
as Wi-Fi. It operates in ISM band.
It allowing us to detect objects in the dark or in smoke.
Accurate detection and good accuracy

13. Limitations
We cannot detect the human if concrete walls thicker than 8".
It has low resolution.

14. Applications
Emergency Situations

15. Rescue Operations

16. Law Enforcement

17. FUTURE SCOPE
Wi-vi could be built into a smartphones or a special handheld
device.
Evolution of seeing humans through denser building material
and with a longer range.

18. References
Fadel adib and Dina katabi, see through walls with wi-fi, ACM
SIGCOMM’13 hongkong august 2013.
Seeing through walls"- MIT's Lincoln Laboratory, http://www.youtube.
com/watch?v=H5xmo7iJ7KA.
www.people.csail.mit.edu/fadel/wivi
Wi-Vi system uses Wi-Fi to see through walls Gizmag