Non–line-of-sight imaging over 1.43 km

TLDR

Non‑line‑of‑sight imaging can recover hidden scene details from indirect light, but has been limited to short‑range verifications. The study aims to extend NLOS imaging from meters to kilometers by developing new hardware and software solutions. The authors combine experimental and conceptual innovations to achieve this range increase. This range is about three orders of magnitude longer than previous experiments, opening avenues for real‑world NLOS applications.

Abstract

Significance Non–line-of-sight (NLOS) imaging can recover details of a hidden scene from the indirect light that has scattered multiple times. Despite recent advances, NLOS imaging has remained at short-range verifications. Here, both experimental and conceptual innovations yield hardware and software solutions to increase NLOS imaging from meter to kilometer range. This range is about three orders of magnitude longer than previous experiments. The results will open avenues for the development of NLOS imaging techniques and relevant applications to real-world conditions.