Fig. 1. Transient imaging optical path^[12]

Fig. 2. Non-line-of-sight imaging using phasor-field virtual light wave^[31]. (a) Reconstruction under strong ambient illumination; (b) reconstruction under large depth range

Fig. 3. Ultrafast light field tomography for non-line-of-sight imaging^[32]. (a) Illustration of cylindrical lens array imaging; (b) two steps of cylindrical small lens imaging; (c) typical system setup of an LIFT camera; (d) reconstruction results for moving objects at 30-Hz rate

Fig. 4. Principle of speckle pattern imaging^[38]

Fig. 5. Single-shot non-line-of-sight imaging based on speckle correlations^[38]. (a) System schematic; (b) camera image; (c) reconstructed image; (d) original object

Fig. 6. Non-line-of-sight imaging for speckle patterns based on deep-inverse correlography^[45]. (a) Experimental setup; (b) reconstructed results under different exposure time

Fig. 7. Non-line-of-sight imaging using synthetic wavelength holography^[48]. (a) Synthetic wavelength holography principle; (b) system principle; (c)-(g) sampling phase of the synthetic wavelength holography; (h)-(l) reconstruction results

Fig. 8. Non-line-of-sight imaging based on spatial coherence^[49]. (a) System principle; (b) experimental setup of DuPSal

Fig. 9. Multi-modal non-line-of-sight imaging^[50]. (a) System principle; (b) intensity measurement; (c) reconstruction only using intensity; (d) scattered coherence measurement; (e) fusion reconstruction

Fig. 10. Non-line-of-sight imaging based on digital camera^[57]. (a) Picture taken by camera; (b) estimation of the position of the obstruction; (c) reconstruction result

Fig. 11. Non-line-of-sight imaging based on compressive sensing^[58]. (a) System setup; (b) reconstruction results, the first row uses random pattern, the second row uses Hadamard pattern

Fig. 12. Steady non-line-of-sight imaging^[61]. (a) Experimental setup; (b) object images, captured images, and reconstruction results

Fig. 13. Non-line-of-sight imaging based on thermal camera^[62]. (a) Experimental setup; (b) reconstruction result