Fig. 1. Flow chart of cosinusoidal encoding multiplexed multispectral ghost imaging

Fig. 2. Original images of target objects and three filter models. (a)-(c) Original images; (d) ideal low-pass filter (ILPF); (e) Gaussian low-pass filter (GLPF); (f) Butterworth low-pass filter (BLPF)

Fig. 3. Simulation results of resolution test image. (a) Multispectral image restoration results of three filters under different filter radii; (b) PSNR chart of restored images under different filter parameters combinations; (c) SSIM chart of restored images under different filter parameters combinations

Fig. 4. Simulation results of image coloredChips. (a) Multispectral image restoration results of three filters under different filter radii; (b) PSNR chart of restored images under different filter parameters combinations; (c) SSIM chart of restored images under different filter parameters combinations

Fig. 5. Simulation results of image toysnoflash. (a) Multispectral image restoration results of three filters under different filter radii; (b) PSNR chart of restored images under different filter parameters combinations; (c) SSIM chart of restored images under different filter parameters combinations

Fig. 6. Structure diagram of cosinusoidal encoding multiplexed multispectral ghost imaging

Fig. 7. Results of contrast experiment, where spectral component images of red, green, blue channels and multispectral images are respectively shown in Figs. 7(b) and 7(c). (a) Restoration results under different filtering parameters; (b) restoration results of Gaussian low-pass filter with a filter radius of 45 pixel; (c) imaging results from conventional methods