Technology

59159 readers

2449 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago

MODERATORS

465

Scientists Use WiFi to See Through People's Walls (www.popularmechanics.com)

submitted 9 months ago by gedaliyah to c/technology

108 comments fedilink hide all child comments

“We developed a deep neural network that maps the phase and amplitude of WiFi signals to UV coordinates within 24 human regions. The results of the study reveal that our model can estimate the dense pose of multiple subjects, with comparable performance to image-based approaches, by utilizing WiFi signals as the only input.”

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 15 points 9 months ago (3 children)

Henceforth, the building code shall make mandatory that every room be perfectly grounded Faraday cages (/s).

Still, imagine lethal drones integrated with that technology (of course, they already have infrared, maybe even some adequate wavelength of X-rays).

Nevertheless, pretty cool to see how far we can take preexisting technology with the help of some deep learning layers.

[–] Maggoty 8 points 9 months ago (1 children)

Here's what they're putting in the goggles that Infantrymen wear now.

I don't care to guess what the drones are packing.

[–] [email protected] 3 points 9 months ago (2 children)

What we know about drones is that they have cameras that can discern individuals from 10 km altitude.

What we suspect is that US has Hubble-sized spy satellites that can do almost the same. There were a lot of classified military STS missions.

What is theoretically possible is that US drones and spy sats can function as very large arrays (we do this with astronomical telescopes already) to dramatically increase spatial resolution.

[–] Maggoty 2 points 9 months ago

I'd believe it. When I was in the infantry 20 years ago we could see you 3km away with the optics mounted on our machineguns. And several kilometers with cameras mounted on towers. I don't know how far they went but it was at least 5km because we were directing mortar fire with them and that's about the range of the mortar system we were using.

[–] [email protected] 1 points 9 months ago (1 children)

Oh I wonder if that's how the Pic was taken that trump tweeted out of that rocket launch site, people didn't think it was physically possible for a satellite to have that resolution

[–] [email protected] 1 points 9 months ago

It all comes down to the size of the mirror/lense—the bigger, the better. Up to a point. The biggest problem is air currents and different air densities refracting light and distorting the image. That's what these laser beams are for on photos taken of astronomical observatories—they give reference light spot that can be used to calibrate adaptive optics to current atmospheric conditions reducing distortion.

[–] BreadstickNinja 3 points 9 months ago

Based on the cell phone reception in my house, I already suspect it's a Faraday cage.

[–] [email protected] 1 points 9 months ago

near future building insulation will include enhanced EM spectrum insulation, to prevent or distort leakage into the environment