Figure 2: Overview of the reconstruction algorithm.
From: Single-pixel three-dimensional imaging with time-based depth resolution

The incident laser pulses (a) back-scattered from a 3D scene are temporally broadened (b) and discretely sampled using a high-speed digitizer (c). An image cube (d) is obtained using a reconstruction algorithm, having an intensity distribution along the longitudinal axis (e), from which the depth map (f) and the reflectivity (g) of the scene can be estimated.