Fig. 3: Space-time wave propagation using RSD.
From: Phasor field diffraction based reconstruction for fast non-line-of-sight imaging systems
a The phasor field collected at the aperture forms a spatial frequency cube. Given the output plane, by using the RSD propagation model, we can recover the hidden wavefront at any time instance. b This space-time wave propagation method where one can reveal a spherical wavefront that moves into the hidden scene. Even though (b) only shows reconstruction at a single depth plane, our proposed method can be generalized into the three-dimensional volume as well, which leads to a four-dimensional reconstruction space-time volume.
