tempest. 20+ years ago.
can 'see' computer screens thru walls at a distance.
https://yandex.com/search/?text=tempest+program+see+computer...
Can we make a camera see behind walls? [video]
11–15 of 15 posts
Re: Can we make a camera see behind walls? [video]
#12The title from the video was changed to "What if we made a camera that sees in reverse?" which is more fitting since "seeing behind walls" was a bit clickbaity since the camera is mounted big arm literally peeking with a mirror.
The guy made a home made camera with orthographic projection, that should been enough for the title...
Re: Can we make a camera see behind walls? [video]
#13The orthographic image is the coolest thing I've seen in a while! This is some remarkable engineering. I expected the images to be much lower quality but they look great.
Re: Can we make a camera see behind walls? [video]
#14This reminds me of MIT’s work on femto-photography to see around corners. They used ultrafast laser pulses to bounce light off walls, capturing the reflections from hidden objects. By analyzing the time-of-flight data, they could reconstruct 3D shapes of objects not in direct view. https://web.media.mit.edu/~raskar/cornar/ >
Using a projector and computing the light field (i.e. single pixel, controlled light source) it is also possible to look around corners. It's probably easier to achieve than time of flight of photons.
That's exactly what I was expecting given he [original] video title.
Re: Can we make a camera see behind walls? [video]
#15Amazing engineering here, but isn't this equivalent to raising your camera above the wall and then snapping a pic? This wasn't really seeing behind walls in the sense I expected.
It's a bit different than that since the image perspective is as if the camera is directly in front of the wall. Normally if you take a picture from above the wall, the perspective is from the angle of the camera pointing over the shoulder of the wall.