Spaced Ranger said:

There really isn't a good solution for this kind of problem. I guess it's not a big enough problem for talented AviSynth'ers to apply themselves to a good fix. You would use a chain of diverse functions (denoising, sharpening, etc.), each applied to fix the other fix's artifacts.

You might like to look at http://originaltrilogy.com/forum/topic.cfm/THX-1138-Japanese-letterboxed-LD-preservation/topic/17360/ for links & tests of DeHalo_alpha() [an update to Blinddehalo3() by the same author] and LGhost().

Thankyou Spaced Ranger, will take a look see.

I am new to AVIsynth's more advanced plugins, beyong changing speeds and deinterlacing im new territory.