Fig. 1. Diagram of correlated imaging with pseudothermal light^[5]

Fig. 2. Principle of microwave coincidence imaging^[15]

Fig. 3. Resolution analysis of microwave coincidence imaging^[15]. (a) Coherent transmissions of conventional imaging; (b) Incoherent transmissions of coincidence imaging; (c) Spatial correlation function of conventional imaging; (d) Spatial correlation function of coincidence imaging

Fig. 4. Spatial correlation functions of transmitted waveforms^[9]. (a)-(b) Radiation field and spatial correlation function of random frequency modulation waveform; (c)-(d) Radiation field and spatial correlation function of random amplitude modulation waveform; (e)-(f) Radiation field and spatial correlation function of random phase modulation waveform

Fig. 4. [in Chinese]

Fig. 5. Relationship between effective rank of radiation field reference matrix and size of imaging cell^[17]

Fig. 6. Comparison of various algorithms of microwave coincidence imaging. (a) Target scene; (b) Correlation; (c) Least square; (d) Tikhonov regularization; (e) SBL

Fig. 7. The model error in microwave coincidence imaging

Fig. 8. Results of the reweighted-dynamic-grids-based method^[49]. (a) Target positions; (b)-(d) Results of 1st to 3rd iterations

Fig. 9. "Random radiating and coincidence imaging": Principle and verified experiment. (a) Principle^[8]; (b) Verified experiment^[50]

Fig. 10. Principle of microwave wavefront modulation imaging

Fig. 11. Typical wavefront modulation forms. (a) Random wavefront; (b) Vortex wavefront

Fig. 12. Wavefront modulation imaging to point-targets in X band

Fig. 13. Wavefront modulation imaging to a vehicle target in W band. (a) Imaging scene; (b) Target and imaging results

Fig. 14. Principle of a single pixel camera in optical-domain^[64]

Fig. 15. Principles of three kinds of imaging methods^[65]. (a) Traditional optical imaging method; (b) Single pixel imaging method; (c) Coded-aperture imaging method

Fig. 16. Single pixel imaging with tunable terahertz parametric oscillator^[66]

Fig. 17. Diagram of digital-array-based microwave coincidence imaging system^[15]

Fig. 18. Schematic diagram of plasma-based microwave coincidence imaging system^[72]

Fig. 19. The 1-dimensional frequency-diverse metasurface antenna of Duke university^[73]

Fig. 20. The 2-dimensional frequency-diverse metasurface antenna of Duke university and imaging result^[74]

Fig. 21. Active imaging system with coded metasurface aperture of Duke University and 3D imaging results^[75]

Fig. 22. Imaging system with transmission-type metasurface aperture of Southeast University and imaging results^[81]

Fig. 23. Imaging system with coded metasurface aperture of Xi’an Jiaotong University and the corresponding imaging results^[82-83]

Fig. 24. Coded-aperture imaging experiment in Ka band. (a) Experiment scene and imaging system; (b) Target model; (c) Imaging result of TRM algorithm; (d) Imaging result of SBL algorithm