The images obtained from the ghost imaging experimental setup described in Fig. 1. From left to right column images, the FWHM of the light spots is 44.34 μ m , 64.50 μ m , and 74.38 μ m , respectively. (a)–(c) The results from the conventional ghost imaging; (d)–(f) from the ghost imaging with the localization method; (g)–(i) with the localization and threshold methods by setting I th = 0.6 I max ; (j)–(l) the corresponding cross-sectional images. The blue, black and red profiles stand for the results from the conventional ghost images, the ghost imaging with the localization method and the localized ghost imaging with the 0.6 I max threshold selection, respectively. The unit a.u. is short for arbitrary units.