I tested PaNup using "The Abyss" PAL DVD letterbox, and NTSC R6 DVD, anamorphic; overlaid at 40% PAL and 60% R6 (as it has more resolution); applied at the end a grain plate - LINK
It could be an interesting technique to restore movies that are not available in HD, but only as PAL and NTSC DVDs - or letterbox and anamorphic DVDs.