I found a way to do a correct edge cut with imagemagick, it's about the same result than with omzy (not 100% perfect, it's impossible to automate when screen have barriers or small part) but it's correcting some omzy edge cut bug too (the "warning" plaque in the 3° game screen have a back dot with omzi for exemple).
I think the main engine of my software is ready now so I'm runing a complete field pack generation (will take some time) so i can test it and check lots of special case.
So you have a list of buggy field witch need some manual traitment so i can test and correct them if needed.
Thanks