Snapshot Lidar: Fourier Embedding of Amplitude and Phase for Single-Image Depth Reconstruction

Figure 1. We propose a novel snapshot Lidar imaging system that is inspired by off-axis holography techniques. (1 st col.) Off-axis holography uses oblique illumination to separate the hologram and its twin in Fourier space. (2 nd col.) We leverage the rolling-shutter effect of amplitude modulated continuous wave time-of-flight (AMCW-ToF) cameras to emulate the off-axis principle, thereby separating the time-of-flight hologram and its twin in Fourier space. (3 rd col.) The conventional operation of AMCW-ToF Lidars requires four measurements, whereas our technique is 4x faster, improving both the data bandwidth and temporal resolution. (4 th col.) Reconstructed phase (that encodes depth) from measurements-The reconstructions are quite similar even with 4x fewer measurements.