Talk:AWarpSharpDering

2. AWarpSharpDering by Kurt Bernhard Pruenner
4. Tries to clean up slight ringing around edges by heavily AWarpSharp-ing the
5. image and then applying it only to the areas where the difference is small
6. enough so detail isn't destroyed.
8. Currently only processes the chroma, as that's what sharpeners that cause the
9. ringing in the first place operate on.
11. depth ........ Depth of the AWarpSharpening
13. diffthresh ... differences between the source and the sharpened clip larger
14. than this will not be touched; the smaller the difference the
15. more of the sharpened clip will be used
17. lumathresh ... since the ringing is mostly notable in bright places this
18. threshold will prevent dark areas from being hit too hard, so
19. for instance linework will be preserved
21. debug ........ 0 - normal operation
22. 1 - return sharpened clip
23. 2 - return diffthresh mask
24. 3 - return lumathresh mask
25. 4 - return combined mask
26. 5 - return source (for comparison)

function AWarpSharpDering(clip source, float "depth",int "diffthresh",int "lumathresh",int "debug") {

 depth=Default(depth,32.0)
 diffthresh=Default(diffthresh,8)
 lumathresh=Default(lumathresh,32)
 debug=Default(debug,0)
 
 sharpened=source.AWarpSharp(depth=depth,blurlevel=2,cm=0,bm=0) 

 # absolute differences mask
 diffmask=YV12LUTxy(source,sharpened,yexpr="x y - x y > *",Y=3,U=1,V=1).Levels(0,0.5,diffthresh,255,0,coring=false)

 # source-luma mask
 lumamask=source.Deflate(Y=3,U=1,V=1).Levels(16,0.5,16+lumathresh,0,255,coring=false)

 # both masks multiplied
 mask=YV12LUTxy(lumamask,diffmask,yexpr="x y * 255 /",Y=3,U=1,V=1).Deflate()
 
 result=MergeChroma(MaskedMerge(source,sharpened,mask,Y=3,U=1,V=1),source)
 
 result=debug != 1 ? result : sharpened
 result=debug != 2 ? result : diffmask.Levels(0,1.0,255,16,240,coring=false).MergeChroma(source.BlankClip(color_yuv=$808080))
 result=debug != 3 ? result : lumamask.Levels(0,1.0,255,16,240,coring=false).MergeChroma(source.BlankClip(color_yuv=$808080))
 result=debug != 4 ? result : mask.Levels(0,1.0,255,16,240,coring=false).MergeChroma(source.BlankClip(color_yuv=$808080))
 result=debug != 5 ? result : source
 
 return result

}