Non-line of Sight imaging by SPAD​

Introduction

Single photon avalanche detector (SPAD) has become a hot topic today for its application of seeing the unseen imaging. By utilizing the SPAD’s character we can calculate the time/distance between the object and light source. And by using that information we can ‘tell’ where the object is.

There have been multiple papers published on this topic. The one we have studied is “Detection and tracking of moving objects hidden from view”. It was published last year on nature photonics. The scenario they provided is as follow. First they have the SPAD and laser light source hang at the wall. Then the laser and SPAD would first hit the ground. And these two regions at the ground are our starting point and the end point.