  Mini-EUSO is a small, near-UV telescope observing the Earth and its
atmosphere from the International Space Station. The time resolution of 2.5
microseconds and the instantaneous ground coverage of about $320\times 320$
km$^2$ allows it to detect some Transient Luminous Events, including Elves.
Elves, with their almost circular shape and a radius expanding in time form
cone-like structures in space-time, which are usually easy to be recognised by
the eye, but not simple to filter out from the myriad of other events, many of
them not yet categorised. In this work, we present a fast and efficient
approach for detecting Elves in the data using a 3D CNN-based one-class
classifier.
