Fig. 1. Flow chart of Hadamard single-pixel imaging

Fig. 2. (a) Schematic diagram of the laparoscopic full-color single-pixel endoscopic imaging system with RGB trichromatic light source scheme; (b) Schematic diagram of the modularized single-pixel camera in dashed box

Fig. 3. Compact 4-wavelength LEDs light source. (a) The 4-wavelength LEDs array module; (b) Normalized 4-wavelength spectrum of the LED light box

Fig. 4. (a) Schematic diagram of laparoscopic full-color single-pixel endoscopic imaging system with white light solution; (b) Schematic diagram of the modularized single-pixel camera in dashed box

Fig. 5. Transmittance spectra of spectroscopic prisms

Fig. 6. Imaging results of laparoscopic full-color single-pixel endoscopic imaging system with color bar. (a) Original image captured by CMOS; (b) Reconstruction result of full-color image of the white light scheme; (c) Reconstruction result of full-color image of the RGB trichromatic scheme; (d) Reconstruction result of the R channel of full-color image of the white light scheme; (e) Reconstruction result of the G channel of full-color image of the white light scheme; (f) Reconstruction result of the B channel of full-color image of the white light scheme; (g) Reconstruction result of the R channel of full-color image of the RGB trichromatic scheme; (h) Reconstruction result of the G channel of full-color image of the RGB trichromatic scheme; (i) Reconstruction result of the B channel of full-color image of the RGB trichromatic scheme

Fig. 7. Imaging results of a laparoscopic full-color single-pixel endoscopic imaging system for intestinal models. (a) Original image; (b) Reconstruction result of the full-color image of the white light scheme; (c) Reconstruction result of the R channel of the full-color image of the white light scheme; (d) Reconstruction result of the G channel of the full-color image of the white light scheme; (e) Reconstruction result of the B channel of the full-color image of the white light scheme