Fig. 1. Schematic diagrams of ghost imaging. (a) Principle diagram of traditional ghost imaging; (b) principle diagram of calculating ghost imaging

Fig. 2. Correlation function theory simulation diagram

Fig. 3. Object to be measured

Fig. 4. Comparison between direct imaging of double-slit interference and ghost imaging. (a) Direct imaging of double-slit interference; (b) ghost image of double-slit interference

Fig. 5. Speckle patterns. (a) Random speckle pattern; (b) speckle pattern after 30 cm propagation; (c) speckle pattern after 60 cm propagation; (d) speckle pattern at 478 nm wavelength; (e) speckle pattern at 633 nm wavelength; (f) speckle pattern at 1096 nm wavelength

Fig. 6. Numerical simulation of interference ghost imaging with a wavelength of 633 nm. (a) Reference optical path λ1=633 nm, signal optical path λ2=337 nm; (b) reference optical path λ1=633 nm, signal optical path λ2=1096 nm; (c) reference optical path λ1=633 nm, signal optical path λ2=633 nm

Fig. 7. Numerical simulation of interference ghost imaging with a wavelength of 1096 nm. (a) Reference optical path λ1=1096 nm, signal optical path λ2=633 nm; (b) reference optical path λ1=1096 nm, signal optical path λ2=337 nm; (c) reference optical path λ1=1096 nm, signal optical pathλ2=1096 nm

Fig. 8. Numerical simulation of interference ghost imaging with a wavelength of 478 nm. (a) Reference optical path λ1=478 nm, signal optical path λ2=633 nm; (b) reference optical path λ1=478 nm, signal optical path λ2=1096 nm; (c) reference optical path λ1=478 nm, signal optical path λ2=478 nm

Fig. 9. Computational ghost imaging experimental device. (a) Schematic of the system; (b) experimental equipment

Fig. 10. Double-slit interference ghost imaging with reference optical path wavelengths of 478 nm. (a) Interference ghost imaging with two optical paths of 478 nm wavelength; (b) double-slit interference ghost imaging experiment with reference optical paths of 478 nm wavelength and signal optical paths of white light

Fig. 11. Double-slit interference ghost imaging with reference optical path wavelengths of 633 nm. (a) Interference ghost imaging with two optical paths at 633 nm wavelength; (b) double-slit interference ghost imaging experiment with reference optical paths at 633 nm wavelength and signal optical paths at white light

Fig. 12. Comparison between the ghost imaging double-slit simulation image and the correlation function after second-order correlation. (a) Double-slit simulation image of ghost imaging; (b) ghost imaging correlation function second order correlation property

Fig. 13. Direct imaging of double-slit interference