Fig. 3.

(a) Camera plane hologram, $H_C$, formed using DC subtraction temporal filtering. (b) Arbitrary logarithmic representation of a reconstructed intensity hologram, $H_R$. The two heterodyne gain terms, $S_{\pm \mathrm{\Delta }\omega }$, are masked by the dotted circles (which are a conjugate pair), the shot noise mask, $N$, is depicted by the dashed circle. (c) The thin grey solid line shows the value of the diagonal white dashed line that has been superimposed on $H_R$, averaged over $\pm 5$ pixels in $k_y$. The thick dashed black line shows the average shot noise value of all the pixels in $H_C$ for this particular image reconstruction.