Filters comparable to UnDot and RemoveGrain(mode=1) for 1080p Blu-rays?

[orion44]

UnDot and RemoveGrain(mode=1) were great for DVD encoding.

Can they be used for the same purposes on 1080p Blu-ray movies (before downscaling to SD resolution)?

Are there modern AviSynth equivalents better suited/tuned for high-definition sources that perform a same/similar cleaning function?

[Selur]

RemoveGrain(mode=1): Replaces each pixel with the 3×3 median
UnDot: Replaces a pixel only if it is a clear outlier relative to its neighbors
=> not really use what you are looking for, but maybe try:
KNLMeansCL(d=1, a=2, h=0.8)
or RemoveGrain with a higher mode, i.e.
RemoveGrain(mode=3)

[Didée]

RemoveGrain(mode=1): Replaces each pixel with the 3×3 median
That's not quite correct. The equivalent of a 3x3 median is RemoveGrain(4). RG(1) clamps by the 1st brightest/darkest pixels of the 3x3 environment, RG(2) clamps by the 1st+2nd brightest/darkest environment pixels, RG(3) accordingly, and finally RG(4) in effect does a 3x3 median.

In how far this is efficient for processing HD BDs? Big surprise, it depends on the characteristics of the source material. Some may benefit more, some less. In general, modern BD sources where the source is encoded with a modern codec, should be less prone to show source artefacts like past DVD sources (being mpeg2-encoded) did show.

[Selur]

@Didée: Thanks for the correction.