Fig. 1. Hadamard matrix. (a) 256-order Hadamard matrix generated by Matlab with a resolution of 256×256; (b) structured light map generated on the 16th line with a resolution of 16×16

Fig. 2. Illustration of single-pixel imaging. (a) Active illumination mode for single-pixel imaging; (b) passive illumination mode for single-pixel imaging

Fig. 3. Results of single-pixel imaging under additive noise^[69]. (a) Experimental reconstruction of half white and half blackboard under three different imaging conditions; (b) simulation reconstruction of common objects

Fig. 4. Results of single-pixel imaging under multiplicative noise^[69]. (a) Experimental and simulation results under sinusoidal wave illumination of light source, when the sinusoidal frequency is 100 Hz, and the amplitude is 1/10 of the lighting power; (b) experimental and simulation results under Gaussian wave illumination of light source, in which the variance of Gaussian noise is 2.8% and 5.6% of the lighting power

Fig. 5. Reconstructed images of RS and MS under partial missing detections^[70]

Fig. 6. Reconstructed images of RS and MS under different sampling refresh rates under passive illumination^[69]

Fig. 7. Real-time imaging of methane gas leaks^[32]

Fig. 8. Schematic illustration of near-field, single-pixel THz imaging^[37]

Fig. 9. Experimental schematic of X-ray ghost imaging^[71]. (a) Reference speckle patterns are pre-recorded with CCD1; (b) field transmitted by the object is then recorded by bucket detector CCD1/CCD2, and the object and CCD1 are in the same plane; (c) profile of the direct X-ray beam

Fig. 10. Object and images of X-ray ghost imaging^[65]. (a) Two 3D views of the object from different angles where the area enclosed by the dashed line is the actually exposed part of the object; (b) scanning electron microscope image of part of the object; (c) image reconstructed by CH-MWCNN after 768 exposures

Fig. 11. Schematics of electron ghost imaging experiment^[74]

Fig. 12. Schematic diagram of the imaging scheme^[57]