NLOS Keyhole Imaging Can See Inside a Closed Room

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But researchers at the Stanford Computational Imaging Lab have expanded on a technique called non-line-of-sight imaging so that just a single point of laser light entering a room can be used to see what physical objects might be inside.It’s a clever technique that’s been refined in research labs over the years to create cameras that can remarkably see around corners and generate images of objects that otherwise aren’t in the camera’s field of view, or are blocked by a series of obstacles.

Previously, the technique has leveraged flat surfaces like floors or walls that are in the line of sight of both the camera and the obstructed object.A series of light pulses originating from the camera, usually from lasers, bounce off these surfaces and then bounce off the hidden object before eventually making their way back to the camera’s sensors.But the current NLOS techniques have a big limitation: They’re dependent on a large reflective surface where light reflections coming off a hidden object can be measured.

The keyhole imaging technique, developed by researchers at Stanford University’s Computational Imaging Lab, is so named because all that’s needed to see what’s inside a closed room is a tiny hole (such as a key hole or a peephole) large enough to shine a laser beam through, creating a single dot of light on a wall inside.As with previous experiments, the laser light bounces off a wall, an object in the room, and then off the wall again, with countless photons eventually being reflected back through the hole and to the camera which utilizes a single-photon avalanche photodetector to measure the timing of their return.When an object hidden in the room is static, the new keyhole imaging technique simply can’t calculate what it’s seeing.But the researchers have found that a moving object paired with pulses of light from a laser generate enough usable data over a long period of exposure time for an algorithm to create an image of what it’s seeing.G

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