The highly sensitive camera detects this secondary scatter as it hits the wall. 1įigure 3: This light then scatters a second time off of the hidden target and propagates back towards the wall. However, non-line-of-sight imaging images objects obscured by obstacles by adding another scattering event to this process. The process for non-line-of-sight imaging is similar to that of LiDAR (light detection and ranging), where a laser pulse is sent towards an object and the time-of-flight of the light scattering back off of the object is used to measure the distance between the object and a detector. A combination of lasers, sensitive cameras, and computational reconstruction methods can be used to detect objects hidden by obstacles by scattering light off of surrounding objects. However, that is starting to change as some cutting edge research is opening up possibilities to image around corners and around obstacles. But for the most part, imaging applications are limited to light propagating in a straight line. Many potential benefits for autonomous vehicles, public health, and medical imagingĪ direct line of sight between an object and a camera or detector is typically needed for every imaging application except for extreme cases such as light bending due to gravitational lensing in astronomy. Involves scattering laser light off of surrounding objects onto a hidden target
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