Wi-Vi or wireless vision is one of the most modern technologies which use wireless fidelity or Wi-Fi as the core principle. Basically, it deals with tracking and manipulation of Wi-Fi signals.
Wi-Vi is used to image the obstacles or solids behind any wall or obstructions. The most important advantage of this is it is completely wireless and no cables or wires are used. Hence it becomes more suitable for usage in mobile devices and other lightweight technologies. Wireless facility also allows it to use in armed force and other security agencies.
As we know that SOANR and RADAR uses the principle of transmission and reflected waves, the Wi-Vi which uses the same principle can be called as an adaptation of those. But it also posses several differences and simpler apparatus. We will see those modifications on the coming pages of the paper.
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Researchers have always tried to build a device capable of seeing people through walls. However, previous efforts to develop such a system have involved the use of expensive and bulky radar technology that uses a part of the electromagnetic spectrum only available to the military. Now a system is being developed by Dina Katabi and Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. The device is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors. The system, called “Wi-Vi,” stands for "Wi-Fi" and "vision." is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
Simple definition for Wi-Vi is, as a Wi-Fi signal is transmitted at a wall, a portion of the signal penetrates through it, reflecting off any humans on the other side. However, only a tiny fraction of the signal makes it through to the other room, with the rest being reflected by the wall, or by other objects. Wi-Vi cancels out all these other reflections, and keeps only those from the moving human body. Previous work demonstrated that the subtle reflections of wireless inter signals bouncing off a human could be used to track that person's movements, but those previous experiments either required that a wireless router was already in the room of the person being tracked. Wi-Fi signals and recent advances in MIMO communications are used to build a device that can capture the motion of humans behind a wall and in closed rooms. Law enforcement personnel can use the device to avoid walking into an ambush, and minimize casualties in standoffs and hostage situations. Emergency responders can use it to see through rubble and collapsed structures. Ordinary users can leverage the device for gaming, intrusion detection, privacy-enhanced monitoring of children and elderly, or personal security when stepping into dark alleys and unknown places.
The concept underlying seeing through opaque obstacles is similar to radar and sonar imaging. Specifically, when faced with a non-metallic wall, a fraction of the RF signal would traverse the wall, reflect off objects and humans, and come back imprinted with a signature of what is inside a closed room. By capturing these reflections, we can image objects behind a wall.
Wi-Vi is a see-through-wall technology that is low-bandwidth, low-power, compact, and accessible to non-military entities. Wi-Vi is a see-through-wall device that employs Wi-Fi signals in the 2.4 GHz ISM band.
Seeing through walls using Wireless Vision Technology. Wi-Fi signals are typically information carriers between a transmitter
and a receiver. In this paper, we show that Wi-Fi can also
extend our senses, enabling us to see moving objects through walls and behind closed doors.
WIVI is based on the principle of RADAR and SONAR imaging which works on Doppler’s effect. RADAR is an Object detection system which uses waves to determine the range, altitude, direction or speed of objects.Depends on its own transmitting signal.
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Researchers have always tried to build a device capable of seeing people through walls. However, previous efforts to develop such a system have involved the use of expensive and bulky radar technology that uses a part of the electromagnetic spectrum only available to the military. Now a system is being developed by Dina Katabi and Fadel Adib, could give all of us the ability to spot people in different rooms using low-cost Wi-Fi technology. The device is low-power, portable and simple enough for anyone to use, to give people the ability to see through walls and closed doors. The system, called “Wi-Vi,” stands for "Wi-Fi" and "vision." is based on a concept similar to radar and sonar imaging. But in contrast to radar and sonar, it transmits a low-power Wi-Fi signal and uses its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
Simple definition for Wi-Vi is, as a Wi-Fi signal is transmitted at a wall, a portion of the signal penetrates through it, reflecting off any humans on the other side. However, only a tiny fraction of the signal makes it through to the other room, with the rest being reflected by the wall, or by other objects. Wi-Vi cancels out all these other reflections, and keeps only those from the moving human body. Previous work demonstrated that the subtle reflections of wireless inter signals bouncing off a human could be used to track that person's movements, but those previous experiments either required that a wireless router was already in the room of the person being tracked. Wi-Fi signals and recent advances in MIMO communications are used to build a device that can capture the motion of humans behind a wall and in closed rooms. Law enforcement personnel can use the device to avoid walking into an ambush, and minimize casualties in standoffs and hostage situations. Emergency responders can use it to see through rubble and collapsed structures. Ordinary users can leverage the device for gaming, intrusion detection, privacy-enhanced monitoring of children and elderly, or personal security when stepping into dark alleys and unknown places.
The concept underlying seeing through opaque obstacles is similar to radar and sonar imaging. Specifically, when faced with a non-metallic wall, a fraction of the RF signal would traverse the wall, reflect off objects and humans, and come back imprinted with a signature of what is inside a closed room. By capturing these reflections, we can image objects behind a wall.
Wi-Vi is a see-through-wall technology that is low-bandwidth, low-power, compact, and accessible to non-military entities. Wi-Vi is a see-through-wall device that employs Wi-Fi signals in the 2.4 GHz ISM band.
Seeing through walls using Wireless Vision Technology. Wi-Fi signals are typically information carriers between a transmitter
and a receiver. In this paper, we show that Wi-Fi can also
extend our senses, enabling us to see moving objects through walls and behind closed doors.
WIVI is based on the principle of RADAR and SONAR imaging which works on Doppler’s effect. RADAR is an Object detection system which uses waves to determine the range, altitude, direction or speed of objects.Depends on its own transmitting signal.
Wireless vision is a device which operates wirelessly and captures the moving objects behind the wall. WiFi or Wireless Fidelity signals are information carriers between a transmitter and a receiver. Through Wireless Vision, WiFi can be extended to our senses thereby allowing visualizing moving objects through closed doors and walls. These signals are helpful in identifying the people number and their locations while they are in a closed room. It can also help in identifying gestures behind the wall and also it combines gestures to communicate the messages to the wireless receiver without carrying any transmitting device.
This paper describes ultrasonic blind walking stick with the use of arduino. According to WHO, Visually impaired can range from mild severe. Worldwide, between 300 million people are visually impaired due to various causes just about 50 million People are totally Blind in the order of 80 of blindness occurs in people over 50years of age. If u notice them , you can very well know about it they can’t walk without the help of other. For Blind People without Any Support Its very Difficult to reach there. They faces many problems in their daily routine day to day life. revelation loss was linked by means of suicidal thoughts of suicide attempts, in a new study from south Korea. “People with visual harm often suffer substantial psychosocial consequences,†the authors wrote in the British Journal Of Ophthalmology. Ophthalmology is a branch of medicine and surgery which deals with the diagnosis and treatment of eye disorders. Shobhana Sonwane | Priyanka Gaidhane | Diksha Mohane | Nikita Gajbhiye | Akansha Patil | Tasneem Hasan "Smart Blind Stick using Arduino" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30754.pdf Paper Url :https://www.ijtsrd.com/engineering/computer-engineering/30754/smart-blind-stick-using-arduino/shobhana-sonwane
Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas[1] and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or cellular networks), or even a replacement in contexts of data broadcasting.
Wireless vision is a device which operates wirelessly and captures the moving objects behind the wall. WiFi or Wireless Fidelity signals are information carriers between a transmitter and a receiver. Through Wireless Vision, WiFi can be extended to our senses thereby allowing visualizing moving objects through closed doors and walls. These signals are helpful in identifying the people number and their locations while they are in a closed room. It can also help in identifying gestures behind the wall and also it combines gestures to communicate the messages to the wireless receiver without carrying any transmitting device.
This paper describes ultrasonic blind walking stick with the use of arduino. According to WHO, Visually impaired can range from mild severe. Worldwide, between 300 million people are visually impaired due to various causes just about 50 million People are totally Blind in the order of 80 of blindness occurs in people over 50years of age. If u notice them , you can very well know about it they can’t walk without the help of other. For Blind People without Any Support Its very Difficult to reach there. They faces many problems in their daily routine day to day life. revelation loss was linked by means of suicidal thoughts of suicide attempts, in a new study from south Korea. “People with visual harm often suffer substantial psychosocial consequences,†the authors wrote in the British Journal Of Ophthalmology. Ophthalmology is a branch of medicine and surgery which deals with the diagnosis and treatment of eye disorders. Shobhana Sonwane | Priyanka Gaidhane | Diksha Mohane | Nikita Gajbhiye | Akansha Patil | Tasneem Hasan "Smart Blind Stick using Arduino" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30754.pdf Paper Url :https://www.ijtsrd.com/engineering/computer-engineering/30754/smart-blind-stick-using-arduino/shobhana-sonwane
Light Fidelity (Li-Fi) is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi. The term was coined by Harald Haas[1] and is a form of visible light communication and a subset of optical wireless communications (OWC) and could be a complement to RF communication (Wi-Fi or cellular networks), or even a replacement in contexts of data broadcasting.
Presentation gives more insight about what is Converged Infrastructure , types of Converged Infrastructure and its benefits. Also it provides details about various Converged Infrastructure vendors in market and their shares.
Inspired by science fiction movies such as Star Wars, two FinnishInspired by science fiction movies such as Star Wars, two Finnish virtual reality researchers created the Fog Screen to recreate some virtual reality researchers created the Fog Screen to recreate some of the effects from these movies in real life.of the effects from these movies in real life. Fog Screen is an exciting new projection technology that allows toFog Screen is an exciting new projection technology that allows to project images and video onto a screen of dry fog, creating the project images and video onto a screen of dry fog, creating the illusion that the images are floating in mid air.illusion that the images are floating in mid air. The Fog Screen is an innovative display technology that allows forThe Fog Screen is an innovative display technology that allows for projections on a thin layer of dry fog.projections on a thin layer of dry fog.
Gesture Recognition using Wireless Signalijsrd.com
This paper presents WiSee, a novel gesture recognition system that leverages wireless signals (e.g., Wi-Fi) to enable whole-home sensing and recognition of human gestures. Since wireless signals do not require line-of-sight and can traverse through walls, WiSee can enable whole- home gesture recognition using few wireless sources. Further, it achieves this goal without requiring instrumentation of the human body with sensing devices.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
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https://alandix.com/academic/papers/synergy2024-epistemic/
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Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
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The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
2. What is Wi-Vi ?
Wi-Vi is one of the most modern
technology which modifies the Wi-Fi
technology to make the concept of
wireless vision possible.
The main logic or idea is the tracking and
manipulation of reflected Wi-Fi signals.
It can hence be called as an adaption of
3. From The Development…
The history of Wi-Fi lies in the campus of
MIT
Developed by professor Dina Katabi and
her graduate student Fadel Adib.
Developed in science and AI laboratory of
MIT by the faculty and student of electrical
engineering and computer science
department
4. The Concept
• As said Wi-Vi
abbreviates wireless
vision.
• Mainly used to
capture the moving
objects behind an
obstruction.
• Hence it could be
better tool for the
6. Introduction
• Wi-vi uses Wi-Fi technology to image
behind the obstacles.
• Totally wireless devices are the main
advantage of the technology.
• Uses only single receiver to map up the
image.
7. Old v/s New
• An array of special antennas are required
in earlier technology to map over
obstacles.
• Each of them capture the signals for
mapping.
• Hence it becomes more expensive
• Wi-Vi uses simpler device receiver than
8. Principle
• Doppler effect is
used in Wi-Vi
similar to SONAR
and RADAR.
• But less frequency
is used compared
to above two.
• Wi-Vi depends on
9. Working
• Two antennas transmit identical signals
where the second antenna signal is the
inverse if the first.
• This causes interference for imaging.
• Wi-Vi relies on a simple 2.4 GHz Wi-Fi
hardware radio.
• Simply this can be decoded on handheld
11. • During the motion of the target, the
distance of it changes with respect to
receiver.
• It changes the time that reflected signal
takes to get back to receiver.
• Only those reflections that changes
between the two signals such as those
from the moving object arrive back at the
receiver.
12. For example, here all the signals form
other obstacles are cancelled out and the
only target is moving human.
13. Tracking Reflections
Refection from human behaves like it is the
source.
Antennas are used to trace a radio frequency
source.
We can find the direction of the signal
movement by steering the beam of antennas.
Finally using this method, when the person
moves, the change in direction can be
16. Extend Of Resolution
• It delivers a basic perspective of the
moving object.
• Simple gestures can be traced using Wi-
Fi.
• The imaging clarity grades lower to that of
a camera quality due to RF signals used
rather than direct light .
17. Challenges In The Path…
• Due to the obstructions and intermediate
object it is essential to generate more
sharper output rays.
• The major challenges faced are :
flash effect
tracking of human movement
18. Flash effect
In this technology, the most challenging
part is the reflections for the wall itself
rather than reflections form the object.
Due to reflection off the wall, minute
variations coming through the object are
prevented from being tracked.
This behavior is known as flash effect.
19. To cancel both wall reflections and direct
signal from transmitting and receiving
antenna, Wi-Vi uses interference nulling.
This increase the sensitivity of the
reflections.
Multi Input Multi Output (MIMO)
antennas are used to nullify the flash
effect.
20. Nullification
Wi-Vi, however, avoids using an antenna
array for two reasons:
In order to achieve a good resolution,
one needs a large antenna array with
many antenna elements. This would
result in a bulky and expensive device.
Since Wi-Vi eliminates the flash effect
using MIMO nulling, adding multiple
receive antennas would require nulling
the signal at each of them. This would
require adding more transmit antenna,
21. To eliminate the flash effect we have to
remove reflected signal received from
stationary objects both in front off and
behind the wall and direct signals from
transmitting antenna to receiving antenna.
Wi-Vi’s uses nulling algorithm which
provides a 42dB mean reduction in signal
power which is enough to remove the flash
effect.
Nulling can be performed in the presence
of objects moving behind the wall and front
22. Nulling involves steps:
– Initial nulling
• Initial output signals are nullified.
– Power nulling
• MIMO radars and antennas boost the power of
signal to increase the sharpness.
– Iterative nulling
• Nulling is done continuously on final signals
23. Track human movements
Reflections include every objects behind
the wall.
But it is possible to clear out the human
reflected rays and to trace their
movement.
So one of the important challenges faced
are those to track the human movements
only.
24. Antenna array can eliminate by movement
of target by using ISAR (Inverse Synthetic
Aperture Radar)
There is only one receiver antenna in
ISAR ,so at any point in time we capture a
single measurement.
25. Since the target is moving consecutive
measurements in time eliminate an
inverse antenna array that is as if the
moving human is imaging the Wi Vi
device.
By processing such consecutive
measurements using standard antenna
array beam steering. Wi-vi can identify the
spatial direction of the human.
26. Gesture Based Communication
• For wireless communication with a system,
usually humans need to carry any wireless
device.
• Wi-Vi allow freehand communication using
gestures for humans without wireless
devices.
• Wi-Vi designates pair of gestures as 0 bit
and 1 bit.
27. Advantages
Operates in same bandwidth as Wi-Fi.
Wall imaging can be done without
accessing any device on the other side of
wall.
Signal wavelength of 12.5 cm are only
used.
28. • Its low power low cost and low bandwidth
makes it accessible for the average users.
• It operates in Industrial Scientific and
Medical radio band. (ISM band).
• It motivates a new form of user interfaces
which rely solely on using the reflections of
a transmitted RF signal to identify human
gestures .
• By leveraging finer nulling techniques and
employing better hardware, the system
can evolve to seeing humans through
denser building.
29. Limitations
Low resolution display is only possible.
Detection of human is only possible for
walls below 8 inch thickness.
Humans need to move by about 50cm to
achieve a narrow beam.
Short range of communication is only
30. Way To Go…
• Can be built in to special hand held devices.
• High quality imaging can possibly be done.
• Sight mapping through denser building beyond 8
inch thicker walls may be possible.
• Possibly used as next generation RADAR.
• The efficient device for military purpose may get
31. Applications
Can be implemented
on smart phone a and
hand held devices.
Used in monitoring
purposes.
Virtual gaming is
possible.
32. Conclusion
• Wi-Vi or wireless vision technology is the
simplest evolution for communicating.
• Rather than RADARS and old measures, it
can be afforded simply and cheaply.
• Its operation in ISM band makes it easily
accessible to public without any specially
built transmitting devices.
33. • Hence in most ways, it makes a
sense that Wi-Vi technology is one
further step in the fields of electronics
and has the most scope of
improvements and applications an far
considered…