mimg is the software used on the AXIOM Beta to load overlay graphic files that are then shown "on-top" of the cameras live image. This guide should explain the technical background of this overlay and how it is "merged" with the real time camera view in real time in the FPGA. The guide should explain the parrameters and options of mimg. The guide should contain some downloadable demo overlays as well as a section showing how to convert transparent graphics into the format required for an overlay in the camera.

Reference: https://wiki.apertus.org/index.php/AXIOM_Beta/Manual#mimg