Fig. 1. Single-pixel SFDI system based on multi-wavelength lock-in photon counting detection

Fig. 2. Reconstructed and filtering-processed results based on steady single-photon counting mode under single wavelength. (a) Wiener filtering; (b) mean filtering; (c) median filtering

Fig. 3. Model of inhomogeneous phantom

Fig. 4. Reconstructed results of inhomogeneous phantom based on steady single-photon counting mode under three wavelengths. (a) 445 nm; (b) 532 nm; (c) 660 nm

Fig. 5. Reconstructed results from lock-in photon-counting detection at three wavelengths. (a) 445 nm; (b) 532 nm; (c) 660 nm