AddGrain

HolyWu · 21st August 2014, 17:29

https://github.com/HomeOfVapourSynth...Synth-AddGrain

foxyshadis · 21st August 2014, 20:24

AddGrain is destructive enough that it probably wouldn't matter if you just zeroed the LSB out or replaced it with the output of the linear congruential generator already built into the filter, unless you have a very, very tiny variance. For future optimization work, you can generate the noise pattern to match the bitdepth, so that you can ignore bitdepth entirely during the getframe and just add them together directly like the Avisynth version. Getting into whether to destroy LSB entirely is a bit trickier, but it'd be even faster.

Looks like it should work as-is though.

Reel.Deel · 24th August 2014, 16:41

@HolyWu

Thanks for all you efforts! I guess is now possible for a native GrainFactory3

HolyWu · 9th June 2015, 18:29

Update r5.

Support 32-bit float input.

HolyWu · 19th June 2020, 14:47

Update r8.

Fix pixel rounding issue in integer formats.
Add SSE2, AVX2 and AVX512 optimizations.

Selur · 19th June 2020, 19:34

Thanks

Cary Knoop · 7th July 2020, 07:04

Did anyone think about using grain applied with motion-compensated vectors, it could improve perceptual resolution.

21st August 2014, 17:29	#1 \| Link
HolyWu Registered User Join Date: Aug 2006 Location: Taiwan Posts: 392	AddGrain https://github.com/HomeOfVapourSynth...Synth-AddGrain Last edited by HolyWu; 31st May 2018 at 11:30.

9th June 2015, 18:29	#4 \| Link
HolyWu Registered User Join Date: Aug 2006 Location: Taiwan Posts: 392	Update r5. Support 32-bit float input.

19th June 2020, 14:47	#5 \| Link
HolyWu Registered User Join Date: Aug 2006 Location: Taiwan Posts: 392	Update r8. Fix pixel rounding issue in integer formats. Add SSE2, AVX2 and AVX512 optimizations.

19th June 2020, 19:34	#6 \| Link
Selur Registered User Join Date: Oct 2001 Location: Germany Posts: 7,424	Thanks __________________ Hybrid here in the forum, homepage

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21st August 2014, 20:24	#2 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,559	AddGrain is destructive enough that it probably wouldn't matter if you just zeroed the LSB out or replaced it with the output of the linear congruential generator already built into the filter, unless you have a very, very tiny variance. For future optimization work, you can generate the noise pattern to match the bitdepth, so that you can ignore bitdepth entirely during the getframe and just add them together directly like the Avisynth version. Getting into whether to destroy LSB entirely is a bit trickier, but it'd be even faster. Looks like it should work as-is though.

24th August 2014, 16:41	#3 \| Link
Reel.Deel Registered User Join Date: Mar 2012 Location: Texas Posts: 1,671	@HolyWu Thanks for all you efforts! I guess is now possible for a native GrainFactory3

7th July 2020, 07:04	#7 \| Link
Cary Knoop Cary Knoop Join Date: Feb 2017 Location: Newark CA, USA Posts: 398	Did anyone think about using grain applied with motion-compensated vectors, it could improve perceptual resolution.