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branon
Every Wi-Fi router, or only routers it's trained on, deployed into rooms it's been trained on with camera footage?
teaearlgraycold
Seems like you'd need to know the geometry of the room in advanced (either by reconstructing it in software or training like they did with a camera).
xethos
Or have a near-identical room to train on, and relatively thin walls in between, say, apartment units, to allow the signal through. This won't account for differences in furniture, but I'd imagine, over time, one could filter out and work around static objects.

America's cheap-as-hell apartments could cause even more problems beyond giving apartments a bad rap!

CommitSyn
I remember something similar from years ago but this is more recent: https://www.zmescience.com/feature-post/technology-articles/...

> For their demonstration, the researchers used three $30 WiFi routers and three aligned receivers that bounce WiFI signals around the walls of a room. The system cancels out static objects and focuses on the signals reflected off moving objects, reconstructing the pose of a person in a radar-like image. This was shown to work even if there was a wall between the routers and the subjects.

kumarvvr
The model only works if the furniture or the room is not modified much.

However, it's scary to think the implications.

Could we have a camera pointed through a telescope aimed at a window, have a radio receiver outside the said window, and train a model to predict human movements inside a room?

ikekkdcjkfke
Drone with kali linux. Does some circling to detect it's own sig
[deleted]
(comment deleted)
tabtab
I wanna Faraday'd House.
jondwillis
I have 4 routers to bounce signal well enough to use everywhere in a thick plaster(?) ~1000sqft apartment. Am I somewhat ok or do the multiple routers make it worse?
ofrzeta
It's not a "camera", you need more than one WiFi device and you can't identify people. Still impressive and scary without the hyberbole.
smegsicle
gait is fingerprintable
ofrzeta
Good point. Actually I thought a lot about this without any connection to tech. Because I noticed that we (I) am able to discern people from quite some distance and wondered if there's some evolutionary reason for this.
thfuran
IFF is probably pretty useful.
avery17
Put a rock in your shoe.
er0k
In 2016 there was an Atlantic article detailing all the different ways wifi could be used to spy on you.

> By analyzing the exact ways that a Wi-Fi signal is altered when a human moves through it, researchers can “see” what someone writes with their finger in the air, identify a particular person by the way that they walk, and even read a person’s lips with startling accuracy—in some cases even if a router isn’t in the same room as the person performing the actions.

I'm not surprised training models on this data made the process much easier.

https://www.theatlantic.com/technology/archive/2016/08/wi-fi...

https://news.ycombinator.com/item?id=12353605

rcarr
Anyone else picturing this as like the Netflix version of Daredevil when they show you how he perceives the world through sound?
mondayp
I’ve been warning people about this shit for more than 10 years, ever since Apple bought WIFISlam and made it disappear... haven’t I? And believe me when I say that 5G give them an even clearer picture. We are being watched and listened to 24/7.