Scattering medium-robust computational ghost imaging with random superimposed-speckle patterns

Illumination patterns of a ghost imaging (GI) system disturb when passing through a scattering medium. Within limits, the larger the speckle size, the stronger the anti-interference ability of illumination pattern to scattering medium, but the lower the imaging resolution. Computational ghost imaging (CGI) system has the advantage of flexible design of illumination patterns. We analyze and demonstrate that using random superimposed-speckle patterns as the illumination pattern of CGI system (RSCGI) can enhance the anti-interference ability of illumination pattern to scattering medium without reducing the imaging resolution when intensity fluctuation correlation reconstruction algorithm is used. Experimental results show that the contrast-to-noise ratio (CNR) and imaging resolution are obviously improved.