Fig. 1. Experimental device diagram of reflection ghost imaging

Fig. 2. Speckle patterns of different speckle particle sizes. (a) Speckle particle size of 1 pixel×1 pixel; (b) speckle particle size of 5 pixel×5 pixel

Fig. 3. Numerical simulation reconstruction results of computational ghost imaging. (a)(b) Reconstruction results based on 500 and 1500 simulations of speckles with a size of 5 pixel×5 pixel; (c)(d) reconstruction results based on 500 and 1500 simulations of speckles with a size of 1 pixel×1 pixel

Fig. 4. Superimposed speckle patterns. (a) Randomly selected superimposed speckle pattern 1; (b) randomly selected superimposed speckle pattern 2

Fig. 5. Numerical simulation reconstruction results of computational ghost image based on superimposed speckle. (a) After 500 times of numerical simulation; (b) after 1500 times of numerical simulation

Fig. 6. CNR curves of different sizes of speckles after different times of simulation

Fig. 7. Randomly selected speckle patterns from different types of superimposed speckles. (a) Only 5 pixel×5 pixel speckle particles are randomly inserted; (b) only 3 pixel×3 pixel speckle particles are randomly inserted

Fig. 8. Numerical simulation reconstruction results of computational ghost imaging. (a)(b) Reconstruction results obtained after 500 and 1500 simulations using superimposed speckles based on randomly inserted 5 pixel×5 pixel speckle particles; (c)(d) reconstruction results obtained after 500 and 1500 simulations using superimposed speckles based on randomly inserted 3 pixel×3 pixel speckle particles

Fig. 9. CNR curves of superimposed speckles containing different speckle particles after different times of simulation

Fig. 10. Analyte

Fig. 11. Results of different sizes of speckles after reflection ghost imaging experiments with different times. (a) Speckle particle size of 5 pixel×5 pixel, 1500 times; (b) superimposed speckles, 1500 times; (c) speckle particle size of 1 pixel×1 pixel, 1500 times

Fig. 12. CNR curves of speckles with different coherence lengths after different tests