Fig. 1. Schematic diagram of computational ghost imaging

Fig. 2. Random speckle pattern

Fig. 3. Average spectrum distribution of random speckle pattern

Fig. 4. Curve of the average value of threshold value under different measurement times

Fig. 5. Schematic diagram of speckle pattern decomposition

Fig. 6. Schematic diagram of fusion algorithm

Fig. 7. Comparison of reconstructed results for CGI, DGI and this paper

Fig. 8. Curve of average PSNR and contrast of four images under different measurement times