The access to this menu is under evaluation… Image > Edges Only…
(you must be under analysis mode, i.e. frames extracted to memory, to be able to try it).
I have a feeling that nobody is actually using it, is it justified ?
Removing it would slightly simplify the Image menu (anticipating on the addition of some other menus that'll come later on).
So if you ever used it or think it'll be useful at some point, have your say now ! Otherwise, we'll just say good bye to it.
(The initial idea of this function was to better see the motion taking place but it's not very convincing…)