Role of Transients in Two-Bounce Non-Line-of-Sight Imaging

Two-Bounce NLOS (c) Experimental Setup (d) Reconstruction with 10 Measurements (b) Application Settings Hidden Target SPAD Multiplexed Illumination Occluder Streets Tunnels Corridors Forests Backprojection from intensity only Backprojection from transients (60 ps resolution) 10 cm Occluded object Figure 1. Two-bounce Transient NLOS Imaging. (a) We propose using two-bounce transients for NLOS imaging. Two-bounce signals capture information about the shadows in a scene, and use of transient information can reduce the number of measurements needed for reconstruction by using multiplexed illumination. (b) Our work can be applicable in many scenarios, such as tunnels, corridors, streets, and forests. (c)-(d) We experimentally validate the use of two-bounce transients on real objects. We show that time-of-flight information enables more robust reconstructions of occluded objects while using fewer measurements.