Detect silhouette only
With this mode selected, the movement detection feature uses all the rough structures of an object to detect movement.
Also detect object contours
With this mode selected, object outlines are also detected and included in the movement analysis.
Also detect details
With this mode selected, not only silhouettes and contours, but also the details of an object are included in the movement analysis.
Summary:
This section is where you decide how to optimise movement detection, depending on the video footage and your personal criteria (which only you can choose). Luckily you need no mathematical skills for this – which is why you’ll probably prefer Mercalli to other stabilisation programs.