  Single-photon time-of-flight (TOF) non-line-of-sight (NLOS) imaging enables
the high-resolution reconstruction of objects outside the field of view. The
compactness of TOF NLOS imaging systems, entailing the miniaturization of key
components within such systems is crucial for practical applications. Here, we
present a miniaturized four-channel time-correlated single-photon counting
module dedicated to TOF NLOS imaging applications. The module achieves
excellent performance with a 10 ps bin size and 27.4 ps minimum
root-mean-square time resolution. We present the results of TOF NLOS imaging
experiment using an InGaAs/InP single-photon detector and the time-correlated
single-photon counting module, and show that a 6.3 cm lateral resolution and
2.3 cm depth resolution can be achieved under the conditions of 5 m imaging
distance and 1 ms pixel dwell time.
