mBgModel(1) on Linux
The text 4478d1c00486, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it. The page shows this text now.
Re-project and mosaic your images, with background rectification
Flags it lists
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-a -
-d -
-i -
-l -
-niter -
-r -
-s