Fig. 1. Setup of reflective GI with the rough object. n→ denotes a unit vector pointing in the direction perpendicular to the object plane, and xr,xt represent the coordinate at the reference detector plane and test detector plane, respectively.

Fig. 2. Retrieved ghost images of the rough object with 10,000 measurements under different degrees of surface roughness. From (a) to (c), the value of mesh number N is 240, 360, and 600, respectively. Black solid curves in the lower area show the normalized horizontal sections of the images. (d) Dependence of the corresponding SNR on the mesh number N. The incident angle is θi=π/4, and the reflective angle is θo=0.

Fig. 3. Acquired images of the reflective target with a rough surface under different test detectors’ transverse sizes D. In (a)–(c), the transverse sizes are 2070, 690, and 172.5 μm, respectively. (d) The corresponding SNR versus D. Other parameters are chosen as N=240, and θi=θo=π/4.

Fig. 4. Experimental results of GI for a rough object and a smooth target under different reflective angles θo. (a) and (b) are ghost images of a rough object with N=240, θi=π/4, θo=π/4, and 5π/12, respectively. (c) and (d) are the results of a smooth target under θi=θo=π/4 and 5π/12, respectively.