Table 4.

Numerical estimates of the Signal to Noise ratio (SNR) in the ghost images of different dimensions along with the total number of photons acquired corresponding to different acquisition times.

Image dimensions	Total photons = Average photons/pixel $\times$ no of pixels	Imaging time (sec)	Signal to noise ratio (SNR)
64$\times$64	$98304=12\times {(64)}^2$	4	3.46
64$\times$64	$786432=96\times {(64)}^2$	32	9.80
64$\times$64	$3686400=450\times {(64)}^2$	150	21.21
128$\times$128	$14745600=450\times {(128)}^2$	150	21.21
256$\times$256	$58982400=450\times {(256)}^2$	150	21.21
512$\times$512	$6291456=450\times {(512)}^2$	150	21.21
1024$\times$1024	$235929600=450\times {(1024)}^2$	150	21.21
2028$\times$2028	$3774873600=450\times {(2028)}^2$	150	21.21