If they're all from the exact same LD release (i.e. they're all from Star Wars Definitive Collection LDs) then look up an avisynth filter called TooT (stands for Two out of Three). It will essentially take your 3 captures and combine them into one good one that's free of any rot spots or other imperfections not on the original LD. I'm sure there are other avisynth plugins out there as well.
If they're not from the same LD release, good luck and let me know if you come up with something.