Perverted Geeks Using Wi-Fi to See Through Dorm Walls
This comes to being from what’s called variance-based radio tomographic imaging.
The idea is fairly straightforward believe it or not.
So – Any change in the volume of space through which the signals pass, for example caused by the movement of a person, makes the signal strength vary.
This means by “interrogating” this volume of space with many signals, picked up by multiple receivers you’re able to build up a picture of the movement within it.
Those researchers/voyeurs, call them what you will, were able to detect movement in a room to within a meter or so, which is pretty good.
Rest assured that they can’t see what you look like in the shower…………….. yet.