This project is a very simple and mostly worthless prototype that was used to showcase RAIS running on a Raspberry Pi 3B+. Don't use this for anything real. Its purpose is to scan a filesystem for images and present an interface into the filesystem to let users see JP2s served up by RAIS and presented in a simple OpenSeadragon view.
That's all the explanation you will get. Look at the source if you really want details. Things are very hard-coded and we don't expect to maintain this project.