Non-line-of-sight (NLOS) imaging techniques use light that diffusely reflects
off of visible surfaces (e.g., walls) to see around corners. One approach
involves using pulsed lasers and ultrafast sensors to measure the travel time
of multiply scattered light. Unlike existing NLOS techniques that generally
require densely raster scanning points across the entirety of a relay wall, we
explore a more efficient form of NLOS scanning that reduces both acquisition
times and computational requirements. We propose a circular and confocal
non-line-of-sight (C2NLOS) scan that involves illuminating and imaging a common
point, and scanning this point in a circular path along a wall. We observe that
(1) these C2NLOS measurements consist of a superposition of sinusoids, which we
refer to as a transient sinogram, (2) there exists computationally efficient
reconstruction procedures that transform these sinusoidal measurements into 3D
positions of hidden scatterers or NLOS images of hidden objects, and (3)
despite operating on an order of magnitude fewer measurements than previous
approaches, these C2NLOS scans provide sufficient information about the hidden
scene to solve these different NLOS imaging tasks. We show results from both
simulated and real C2NLOS scans.

本文介绍了一种名为 Circular and Confocal Non-line-of-sight (C2NLOS) 扫描的非直线视野成像技术，它使用激光和超快速感应器来测量多次散射光的行程时间，以了解隐藏的场景。与现有的 NLOS 技术相比，这种技术可以更高效的扫描目标，同时提高成像的质量和效率。