Researchers use a laser to scan the entire room through the keyhole

Researchers at Stanford Lab have perfected a non-line-of-sight imaging technique.

Now scientists only need one point of laser light entering the room. It can be used to see what objects are inside.

The basis of the method is technology, which has alreadyhas been used for years to create cameras that can see around corners and generate images of objects that are not in the camera's field of view or are blocked by obstacles. Previously, this technique used flat surfaces, such as the floor or walls, that were in the line of sight of both the camera and the obstructing object.

A series of light pulses emanating from the camera,usually from lasers, reflects off these surfaces, then bounces off a hidden object, and then returns to the camera's sensors. The algorithms then use information about how long it took for the reflection to create an image of what the camera cannot see. The results are usually of poor quality, but even this is enough to identify the object.

Keyhole imaging methodso named because it allows you to see objects inside a closed room through a tiny opening (such as a keyhole or peephole). A laser beam enters the room through it, creating a single point of light on the wall inside the room. Then the light bounces off the wall, off the object in the room, off the wall again. Countless photons are reflected back into the camera, which uses a single-photon avalanche photodetector to measure their return time.

When an object hidden in a room is motionless,the new keyhole imaging technique simply can't figure out what it's seeing. But the researchers found that a moving object paired with pulses of light from a laser generated enough useful data over a long exposure time for the algorithm to create an image of it.

Researchers have improved the quality of recognition withusing AI. It can even detect blurry images of a person or a closet by adding a picture from an image database that already has similar models.

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