  Detecting the 21-cm hyperfine transition from neutral hydrogen in the
intergalactic medium is our best probe for understanding the astrophysical
processes driving the Epoch of Reionisation (EoR). The primary means for a
detection of this 21-cm signal is through a statistical measurement of the
spatial fluctuations using the 21-cm power spectrum (PS). However, the 21-cm
signal is non-Gaussian meaning the PS, which only measures the Gaussian
fluctuations, is sub-optimal for characterising all of the available
information. The upcoming Square Kilometre Array (SKA) will perform a deep,
1000 hr observation over 100 deg$.^{2}$ specifically designed to recover direct
images of the 21-cm signal. In this work, we use the Wavelet Scattering
Transform (WST) to extract the non-Gaussian information directly from these
two-dimensional images of the 21-cm signal. The key advantage of the WST is its
stability with respect to statistical noise for measuring non-Gaussian
information, unlike the bispectrum whose statistical noise diverges. We
introduce a novel method to isolate this non-Gaussian information from mock
21-cm images and demonstrate its detection at 150 (177)~MHz ($z\sim8.5$ and
$\sim7$) for a fiducial model with signal-to-noise of $\sim$5~(8) assuming
perfect foreground removal and $\sim2$~(3) assuming foreground wedge avoidance.
