Fig. 1. Speckle pattern and intensity distribution of Gaussian speckle beam

Fig. 2. Schematic diagram of this paper

Fig. 3. Numerical simulation results of different methods

Fig. 4. Contrast curves with different l

Fig. 5. PSNR curves with different l

Fig. 6. Contrast curves and PSNR curves with different l for different target

Fig. 7. Numerical simulation results with different l

Fig. 8. Result comparing of ghost image before and after combination-modulation of multiple speckle patterns

Fig. 9. Improvement degree schematic diagram of PNSK and contrast