New Plugin from Kassandro - RemoveGrainHD

Pookie · 2nd September 2007, 23:35

RemoveGrainHD 0.1
A collection of Avisynth 2.5x denoising filters

By Rainer Wittmann

http://www.removegrainhd.de.tf/

HD stands for High Definition, i.e. for high resolution input. For this kind of video RemoveGrain, which changes a pixel in terms of its eight direct neighbours, may be too narrow, because due to the high resolution noise often consists of pixel clusters rather than isolated pixels. Thus instead of RemoveGrain's 3x3 neighbourhood the filter RemoveGrainHD uses a rather arbitrary symmetric rectangle (preferrably but not neccessarily a square) around a pixel to process it. Of course not all the many RemoveGrain modes can be extended to this setting. In fact, the current version of RemoveGrainHD only contains the 4 original modes, with which RemoveGrain was started once. Nevertheless a useful Repair variant, which serves the same purpose as the Repair plugin of the RemoveGrain package, is included as well. There is even a spatio-temporal version called TemporalRemoveGrainHD, which has no counterpart in RemoveGrain at all. While RemoveGrain uses a very high level of parallelism - the SSE2/SSE3 version processes 16 pixels simultaneously - this is unfortunately no more possible for RemoveGrainHD. It is a rather ordinary C/C++ program without any inline assembler code. Nevertheless performance is not that bad thanks to some ideas, which I have taken from Tonny Petersen's (called tsp on the Doom9 forum) medianblur filter. However, there are some subtle changes, which should also improve Medianblur. Thus I have reimplemented Medianblur in this plugin. This filter is called Quantile, because it not only can calculate the median of an arbitrary surrounding rectangle but also arbitrary quantiles of these rectangels. The median then is just a special quantile. RemoveGrainHD can be emulated with an Avisynth script, which involves two instances of the filter Quantile and two Lutxy instances. However, such a script is substantially slower.

Prim3 · 3rd September 2007, 00:23

Nice, I might try it sometime.

Thank-you!

salehin · 3rd September 2007, 01:12

Thanks for the filter. Will give it a try. Have you tried using it on Std Def (SD) content? If so, can you please post some comparisons 9screenshots, small clips and etc). I'm still learning about the usage of filters and so your guides will be very helpful

Cheers

- Salehin

Didée · 3rd September 2007, 02:49

Splendid.

Revgen · 3rd September 2007, 05:19

OT: Is Kassandro still banned from the forums?

Or did he just decide not to post anymore?

Boulder · 3rd September 2007, 07:27

I don't think he's banned, at least I remember him posting after the ban I recall him receiving. He probably just got bored of the D9 forum and decided to set up his own.

Pookie · 29th November 2007, 09:52

Version 0.3 (2007.11.26) : Completely new implementation (hopefully faster) of the RemoveGrainHD and TemporalRemoveGrainHD and a more flexible design with include skeletons of the entire plugin.

2nd September 2007, 23:35	#1 \| Link
Pookie Registered User Join Date: Apr 2005 Posts: 1,341	New Plugin from Kassandro - RemoveGrainHD RemoveGrainHD 0.1 A collection of Avisynth 2.5x denoising filters By Rainer Wittmann http://www.removegrainhd.de.tf/ HD stands for High Definition, i.e. for high resolution input. For this kind of video RemoveGrain, which changes a pixel in terms of its eight direct neighbours, may be too narrow, because due to the high resolution noise often consists of pixel clusters rather than isolated pixels. Thus instead of RemoveGrain's 3x3 neighbourhood the filter RemoveGrainHD uses a rather arbitrary symmetric rectangle (preferrably but not neccessarily a square) around a pixel to process it. Of course not all the many RemoveGrain modes can be extended to this setting. In fact, the current version of RemoveGrainHD only contains the 4 original modes, with which RemoveGrain was started once. Nevertheless a useful Repair variant, which serves the same purpose as the Repair plugin of the RemoveGrain package, is included as well. There is even a spatio-temporal version called TemporalRemoveGrainHD, which has no counterpart in RemoveGrain at all. While RemoveGrain uses a very high level of parallelism - the SSE2/SSE3 version processes 16 pixels simultaneously - this is unfortunately no more possible for RemoveGrainHD. It is a rather ordinary C/C++ program without any inline assembler code. Nevertheless performance is not that bad thanks to some ideas, which I have taken from Tonny Petersen's (called tsp on the Doom9 forum) medianblur filter. However, there are some subtle changes, which should also improve Medianblur. Thus I have reimplemented Medianblur in this plugin. This filter is called Quantile, because it not only can calculate the median of an arbitrary surrounding rectangle but also arbitrary quantiles of these rectangels. The median then is just a special quantile. RemoveGrainHD can be emulated with an Avisynth script, which involves two instances of the filter Quantile and two Lutxy instances. However, such a script is substantially slower.

3rd September 2007, 02:49	#4 \| Link
Didée Registered User Join Date: Apr 2002 Location: Germany Posts: 3,618	Splendid. __________________ We´re at the beginning of the end of mankind´s childhood

3rd September 2007, 05:19	#5 \| Link
Revgen Registered User Join Date: Sep 2004 Location: Near LA, California, USA Posts: 1,409	OT: Is Kassandro still banned from the forums? Or did he just decide not to post anymore? __________________ Pirate: Now how would you like to die? Would you like to have your head chopped off or be burned at the stake? Curly: Burned at the stake! Moe: Why? Curly: A hot steak is always better than a cold chop.

3rd September 2007, 07:27	#6 \| Link
Boulder Pig on the wing Join Date: Mar 2002 Location: Hollola, Finland Posts: 3,486	I don't think he's banned, at least I remember him posting after the ban I recall him receiving. He probably just got bored of the D9 forum and decided to set up his own. __________________ And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon...

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

3rd September 2007, 00:23	#2 \| Link
Prim3 Registered User Join Date: Dec 2006 Posts: 47	Nice, I might try it sometime. Thank-you!

3rd September 2007, 01:12	#3 \| Link
salehin Learning Join Date: Nov 2006 Location: Earth Posts: 88	Thanks for the filter. Will give it a try. Have you tried using it on Std Def (SD) content? If so, can you please post some comparisons 9screenshots, small clips and etc). I'm still learning about the usage of filters and so your guides will be very helpful Cheers - Salehin

29th November 2007, 09:52	#7 \| Link
Pookie Registered User Join Date: Apr 2005 Posts: 1,341	Version 0.3 (2007.11.26) : Completely new implementation (hopefully faster) of the RemoveGrainHD and TemporalRemoveGrainHD and a more flexible design with include skeletons of the entire plugin.