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Through-Wall Human Pose Estimation Using Radio Signals

rfpose.csail.mit.edu

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Re: Through-Wall Human Pose Estimation Using Radio Signals

#81

I've noticed, recently, that literally every major chain store I go into blocks my cell signal. I get full bars outside, perfect LTE, and about 5 ft past the glass doors, I'm suddenly cut off. Specifically, Meijer grocery stores and Home Depot are the worst offenders. Coincidentally they offer free in store WiFi to track me with, so I turn off my wifi radio on both smartphone and smartwatch before walking in the door…

classic hackernews

Re: Through-Wall Human Pose Estimation Using Radio Signals

#82
post #7

With this paper our last shreds of privacy are being taken away, but they presented the news with nice background music, so there's that.

Guess you shouldn't read about what synthetic aperture radar systems have been able to do for decades... you can actually make a ghetto radar capable of capturing the data used for this demo with about $350 (in 2012) in materials. But don't worry too much. Their limitations section states that "the operating distance of a radio is dependent on its transmission power" so their system only works reliably up to 40 feet, which is true, but the dominating factor is simply distance, because any signal you get back will be attenuated proportional to 1/r^4. Pumping up the transmitted power to compensate takes a lot of energy that quickly gets you into needing operating licenses. Not to mention moving to using different frequencies that can give higher resolution of whatever you're imaging...

Re: Through-Wall Human Pose Estimation Using Radio Signals

#84

I've noticed, recently, that literally every major chain store I go into blocks my cell signal. I get full bars outside, perfect LTE, and about 5 ft past the glass doors, I'm suddenly cut off. Specifically, Meijer grocery stores and Home Depot are the worst offenders. Coincidentally they offer free in store WiFi to track me with, so I turn off my wifi radio on both smartphone and smartwatch before walking in the door…

In terms of passive signal blocking, I wonder if the chickenwire mesh that holds exterior stucco in place could serve as an effective Faraday cage? Or aluminum siding? I'm sure the metal roof and walls of a modular storage building would.

Most businesses use metal studs to support interior walls, though I doubt their ~2 foot spacing would block wifi or cellular RF.

In terms of active cellular jamming, that should be pretty easy to detect -- by standing in an outside doorway where you'd be exposed to inside AND outside signals, and then checking if your cellular bars fade out. That should indicate that you've been exposed to an internal jamming signal, since the external signal should still remain.

It's hard to imagine that the advantage to a corporation of isolating the customer's phone would be worth the risk of FCC prosecution.

Re: Through-Wall Human Pose Estimation Using Radio Signals

#85
post #79

I'll repeat it again. - Machines that see through walls are coming - Microscopic drones are coming - Mind-reading machines are coming - Private key cryptography will become obsolete Fighting for privacy is backward. It's unsustainable. We must work toward a post-privacy world. The sooner we do it, the smoother the transition will be.

I'm scared. What is a post-privacy world?

A world where you don't have to lie and keep secrets.

A world where people freely share knowledge and resources.

Re: Through-Wall Human Pose Estimation Using Radio Signals

#87

I've noticed, recently, that literally every major chain store I go into blocks my cell signal. I get full bars outside, perfect LTE, and about 5 ft past the glass doors, I'm suddenly cut off. Specifically, Meijer grocery stores and Home Depot are the worst offenders. Coincidentally they offer free in store WiFi to track me with, so I turn off my wifi radio on both smartphone and smartwatch before walking in the door…

Could it be that they had repeater antennas before, but after the LTE upgrades, they either declined to renew the repeater leases in favor of wifi+tracking or perhaps the carriers didn't want to pay for hosting repeaters?

Re: Through-Wall Human Pose Estimation Using Radio Signals

#89
post #6

Love it. This is a game mechanic / movie superhero device that's been around a long time, just love the fact that this does it so simply and with so much promise. As sensitivity and the quality of the neural net increases, combined with AR, this is going to make super soldiers out of SWAT teams.

And this is why you build a shipping container house -- free Faraday cage, built right in. Not mention that it's not hard to convert shipping containers to meet California earthquake code, or so I've read.

> Not mention that it's not hard to convert shipping containers to meet California earthquake code, or so I've read.

Other than bolting crap down wouldn't that basically consist of making sure it won't tip over?

Re: Through-Wall Human Pose Estimation Using Radio Signals

#90
post #67
post #7

With this paper our last shreds of privacy are being taken away, but they presented the news with nice background music, so there's that.

The skeletons appear to have very long legs, but no torsos. I wonder if it was made intentionally that way to make them look less serious.

I also wonder how accurate their estimates are of arm and leg poses, much less their motions. I do believe they can detect the location of a torso. I don't believe they can do the same for forearms, hands, legs, or feet, or their precise motions.

I suspect the articulated pose and motion of their animated stick figures were extrapolated from progressions of articulations of limb poses that were learned from the light-based training videos, and then they were overlaid onto the wifi-based signal of only the moving trunk.

All that animation does look cool, though.

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