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Old 8th November 2012, 17:16   #1  |  Link
18fps
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Despotting in high bit depth?

Lately I have been using Didée's "possible primitive for spot removal":
Code:
o=last ox=o.width() oy=o.height()

osup = o.MSuper(pel=2,sharp=2)
bv1  = osup.MAnalyse(isb=true, delta=1,blksize=8,overlap=4,search=4)
fv1  = osup.MAnalyse(isb=false,delta=1,blksize=8,overlap=4,search=4) 
bc1  = o.MCompensate(osup,bv1)
fc1  = o.MCompensate(osup,fv1)

Interleave(fc1,o,bc1)
MedianblurT(0,0,0,1)   #  you can also use "Clense(reduceflicker=false)" instead
SelectEvery(3,1)

StackHorizontal(o,last)
I like it because it keeps most of the grain, (though it should be tweaked to better distinguish between scenes).
However now I'm working with dpx files (HD, 10 bits) and I'd like to keep the high bit depth. I think I can ingest the dpx into Avisynth with ffms2. With the high bit depth tools, and the available modified plugins, it could be possible to despot and export to 10 bits? I think there is a modified mvtools plugin but I don't think there is a High bit MedianblurT. With what it could be substituted?
Thank you!
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Old 9th November 2012, 00:25   #2  |  Link
cretindesalpes
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MedianBlurT could be replaced with Dither_median16 but the problem is the MVTools, working only with 8-bit input.

Anyway there is an alternative method, not totally equivalent to pure high bitdepth processing, but close enough. Convert to 8 bits, process, and apply the resulting difference to the 16-bit clip:

Code:
FFVideoSource ("blah", enable10bithack=true)	# Or any source outputing stack16 data
o16 = last

DitherPost (mode=-1)

# (insert here the previous script without the final StackHorizontal)

dif = mt_makediff (last, o, y=3, u=3, v=3)
dif16 = dif.Dither_convert_8_to_16 ()
o16.Dither_add16 (dif16, dif=true)
Not tested, but should work in principle.
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Old 9th November 2012, 01:35   #3  |  Link
cobo
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I've found that Clense is more accurate than MedianblurT in that spot removal script when it comes to fast moving objects.
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Old 9th November 2012, 09:14   #4  |  Link
18fps
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@cretindesalpes, Thank you! I'll try it.
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