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Old 11th October 2013, 17:24   #1  |  Link
pancserzso
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How to denoise rendered image sequence

I am trying to filter image sequences rendered by a visualization program. The problem is that the program was not created with animation in mind, and it created an image sequence full of artifacts / temporal noise.

You can see an example of such source here.

Some time ago I was trying to solve the same problem, and I got some help from Didée in this thread however this time some of the samples are worse in quality and the original script didn't really work on them.

Here is the code which I tried to use for filtering:
Code:
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\RemoveGrainSSE3.dll" )
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\mt_masktools-26.dll" )
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\EEDI2.dll" )

o=last 
ox=o.width 
oy=o.height

# round/soften hard corner pixels
o.pointresize(ox*3,oy*3).removegrain(4)
mt_lutxy(last,last.removegrain(11,-1),"x x y - 2.51 * +",U=2,V=2).bilinearresize(ox,oy)
o3=last

bubb0 = o3.eedi2(maxd=8).bicubicresize(ox,oy,0,0,0,0.5).turnleft().eedi2(maxd=8).turnright().bicubicresize(ox,oy,0,0,-0.5,0)
return(bubb0)
And here is the filtered result I got: filteredYV12.mp4

I think my problem is that the code which I'm trying to use is not really strong enough for my source.

Is there any way to create a filter which removes this strong temporal flickering / noise? It's not a big problem if the end result is a bit blurry.

Last edited by pancserzso; 11th October 2013 at 19:31.
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Old 11th October 2013, 20:10   #2  |  Link
raffriff42
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The images are very aliased - is this how the original images are? (crop + 2x blowup)


Can you turn on antialiasing in your render engine? If not, can you render at 4x final size? If so, you can downsample your images with smoothing in Avisynth, or in an image batch processor.

Last edited by raffriff42; 18th March 2017 at 00:24. Reason: (fixed image link)
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Old 11th October 2013, 20:57   #3  |  Link
pancserzso
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Quote:
Originally Posted by raffriff42 View Post
The images are very aliased - is this how the original images are? (crop + 2x blowup)


Can you turn on antialiasing in your render engine? If not, can you render at 4x final size? If so, you can downsample your images with smoothing in Avisynth, or in an image batch processor.
I know, this is the problem. The object in 3D is initially very far from the origin, and the rendering program was not written with this in mind. So when the object is transparent and is far from the origin, these artifacts appear.

The problem with re-rendering is that even in 1.5x resolution it would take me at least 7 days non-stop rendering, and I don't have enough time for that. Also, since its a GPU based program, I might not be able to render some objects, as it'd need >2 GB of GPU memory, and my card only has 2.

Pretty much my only choice is to do filtering in Avisynth.

I've tried a few spatio-temporal denoiser, and so far FFT3DFilter was able to get it really smooth, although very blurry.

I was thinking about using the FFT3D as an input to MVTools and somehow combine it with the original source, but I don't know how to do it. What do you think?
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Old 11th October 2013, 21:37   #4  |  Link
raffriff42
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I'm looking at the script you posted - I like it. Much better than my naive GaussianBlur>Sharpen. The remaining temporal noise is helped by increasing the frame rate from 24 to 60fps with Interframe. This not only adds more temporal smoothing, but the eye is less sensitive to noise at the higher frame rate. Brightening this particular source seems to help as well.

Allowing a small amount of twinkling/shimmering is OK, IMHO- to the uneducated eye it says "sharpness." The added blur of Interframe may allow you to back off some of the smoothing elsewhere.
Code:
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\RemoveGrainSSE3.dll" )
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\mt_masktools-26.dll" )
LoadPlugin( "e:\apps\utils\Video tools\AVSplugins\EEDI2.dll" )
LoadPlugin(pathBase + "mvtools-2.5.11.9-svp\mvtools2.dll")
Import(pathBase + "Interframe\InterFrame2.avsi")
LoadPlugin(pathBase + "SmoothAdjust-2,00\avs-2.5.x\x86\SmoothAdjust.dll")

SmoothLevels(0, 1.0, 160, 0, 255)

o=last 
ox=o.width 
oy=o.height

# round/soften hard corner pixels
o.pointresize(ox*3,oy*3).removegrain(4)
mt_lutxy(last,last.removegrain(11,-1),"x x y - 2.51 * +",U=2,V=2).bilinearresize(ox,oy)
o3=last

bubb0=o3.eedi2(maxd=8).bicubicresize(ox,oy,0,0,0,0.5)
\    .turnleft().eedi2(maxd=8)
\    .turnright().bicubicresize(ox,oy,0,0,-0.5,0)

return bubb0.InterFrame(NewNum=60, NewDen=1)
EDIT - one more thing:
Code:
return bubb0.InterFrame(NewNum=60, NewDen=1).Sharpen(0.4)

Last edited by raffriff42; 11th October 2013 at 22:19. Reason: sharpen
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Old 11th October 2013, 21:52   #5  |  Link
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Do you really need to denoise it? The flickering you see doesn't seem like artifacts to me, but rather like usual 3D->2D projection result. I don't see z-order glitch either, so program has probably sorted the faces too. Though I can not be sure, since the objects look quite small. I too suggest using multisampling or supersampling->downsampling in the rendering program.
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Old 12th October 2013, 00:03   #6  |  Link
pancserzso
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Thanks for the suggestions, but there is nothing I can do with the source at the moment. I am not sure if I need to do denoising or something else, but I would like to make it visually pleasing, without bright points / flickering in brightness.

Here are some filtering I have been trying:

Code:
DeGrainMedian(limitY=10, limitUV=13, mode=1, interlaced=false, norow=false)
DeGrainMedian(limitY=10, limitUV=13, mode=1, interlaced=false, norow=false)
=> result not too bad, handles the extreme noisy part quite well (2-7 sec)

Code:
FFT3DFilter(sigma=3, plane=4, bw=48, bh=48, bt=4, ow=16, oh=16, sharpen=0)
=> result

Code:
tr = 24
FFT3DFilter(sigma=12,bw=tr,bh=tr,ow=tr/2,oh=tr/2,bt=5,plane=0)
=> result

Code:
FFT3DFilter( sigma=6, plane=0, bt=5, bw=32, bh=32, ow=16, oh=16 )
=> result my favourite so far, but may be a bit too blurry

Code:
FluxSmoothST(temporal_threshold=7, spatial_threshold=7)
=> result

Code:
o = last
pre = o.fft3dfilter(sigma=8,sigma2=12,sigma3=10,sigma4=5,bw=24,bh=24,ow=12,oh=12,bt=5).FluxSmoothT(4)

sup1 = o.MSuper(hpad=16, vpad=16, pel=2, levels=1,sharp=2)
sup2 = pre.MSuper(hpad=16, vpad=16, pel=2, levels=0,sharp=0)
bv3  = MAnalyse(sup2,delta=3,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
bv2  = MAnalyse(sup2,delta=2,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
bv1  = MAnalyse(sup2,delta=1,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
fv1  = MAnalyse(sup2,delta=1,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)
fv2  = MAnalyse(sup2,delta=2,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)
fv3  = MAnalyse(sup2,delta=3,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)

o.MDegrain3(sup1,bv1,fv1,bv2,fv2,bv3,fv3,thSAD=360)
=> result really nice looking result at the beginning (0-1 sec) and the end (7-16 sec), but really bad in the middle (2-7 sec)

Last edited by pancserzso; 12th October 2013 at 00:58.
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Old 13th October 2013, 22:23   #7  |  Link
cretindesalpes
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My attempt, similar to the last try of your previous post :
Code:
d     = 2
a1    = RemoveGrain (4).RemoveGrain (12)
a     = a1.TemporalSoften (4, 25, 25, 15, 2)
sup_a = a.MSuper ()
vec   = sup_a.MAnalyse (multi=true, delta=d, blksize=8, overlap=4, search=5, searchparam=4, DCT=5)
sup   = MSuper (levels=1)
MDegrainN (sup, vec, d, thSAD=800)
Quite effective, but a bit blurry at the end.
=> result
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Old 14th October 2013, 03:04   #8  |  Link
pancserzso
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cretindesalpes, thanks a lot! It is almost perfect!! Only a bit too strong / blurry for my taste, because as you can see the most visible fruits in the animation are at the 'end' of their single path.

raffriff42, thanks, but I cannot modify the frame rate nor the brightness, I have to use the clip as it is.

I run the filters on the final clip, which is composed both from flickering fruits and smooth ones.

The challenge here is how to keep the details in the 'big' good examples while filtering the flickering ones out! Cretindesalpes' solution is the best so far, but it's a bit loosing too much details.

Cretindesalpes, would it be possible to either post sharpen or use a bit less filtering?

Here are the results from the final composition:
source-final

cretindesalpes

dgm573
Code:
DeGrainMedian(limitY=5, limitUV=7, mode=3, interlaced=false, norow=false)
DeGrainMedian(limitY=5, limitUV=7, mode=3, interlaced=false, norow=false)
dgm703
Code:
DeGrainMedian(limitY=7, limitUV=0, mode=3, interlaced=false, norow=false)
DeGrainMedian(limitY=7, limitUV=0, mode=3, interlaced=false, norow=false)
Didée old

fft3d-3-48-16
Code:
FFT3DFilter(sigma=3, plane=4, bt=4, bw=48, bh=48, ow=16, oh=16)
fft3d-6-32-16
Code:
FFT3DFilter(sigma=6, plane=0, bt=5, bw=32, bh=32, ow=16, oh=16)
flux
Code:
FluxSmoothST(temporal_threshold=7, spatial_threshold=7)
mdg3
Code:
o = last
pre = o.fft3dfilter(sigma=8,sigma2=12,sigma3=10,sigma4=5,bw=24,bh=24,ow=12,oh=12,bt=5).FluxSmoothT(4)

sup1 = o.MSuper(hpad=16, vpad=16, pel=2, levels=1,sharp=2)
sup2 = pre.MSuper(hpad=16, vpad=16, pel=2, levels=0,sharp=0)
bv3  = MAnalyse(sup2,delta=3,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
bv2  = MAnalyse(sup2,delta=2,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
bv1  = MAnalyse(sup2,delta=1,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=true, dct=5)
fv1  = MAnalyse(sup2,delta=1,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)
fv2  = MAnalyse(sup2,delta=2,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)
fv3  = MAnalyse(sup2,delta=3,truemotion=false,global=true,blksize=16,overlap=16/2,search=5,searchparam=4,isb=false,dct=5)

o.MDegrain3(sup1,bv1,fv1,bv2,fv2,bv3,fv3,thSAD=360)

Last edited by pancserzso; 14th October 2013 at 03:13.
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Old 14th October 2013, 14:34   #9  |  Link
pandy
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MLAA?

http://visual-computing.intel-research.net/publications/papers/2009/mlaa/mlaa.pdf
http://iryoku.com/aacourse/downloads/06-MLAA-on-PS3.pdf

However im not a AVS script guru...
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