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Old 4th September 2004, 15:03   #1  |  Link
scharfis_brain
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temporal & spatial super resolution experiments

I have a lot of low-resolution digicam videos flying around here.

they are mostly 160x120pixels and 15 fps

so I searched for ways improving them.

I found a very good solution for panning-only shots.

It kills all noise and enhances resolution a LOT:



this is the script, I've used:

Code:
loadplugin("D:\x\depan.dll")

avisource("Mvi_0073.avi")

# for comparision
i=lanczos4resize(480,360).converttoyv12()

# for rendering
j=pointresize(480,360).converttoyv12()

data=i.depanestimate(pixaspect=1.0,zoommax=1,improve=false,trust=0)
r=4
j.depaninterleave(data,pixaspect=1.0,prev=r,next=r,mirror=15)
temporalsoften(r,255,255)
selectevery(2*r+1,r)

stackhorizontal(last.subtitle("temporal super resolution"),i.subtitle("original (160x120)"))
but there are downsides:

- differential motion will completely mess up with that script
- if depan doesn't catch the motion, you'll get a super-motion-blurrer
- it is slow.
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Last edited by scharfis_brain; 4th September 2004 at 15:26.
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Old 4th September 2004, 16:03   #2  |  Link
Fizick
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It is interesting, yes. I will try.
BTW, i almost finished coding more fast version of depanestimate.
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Old 4th September 2004, 18:29   #3  |  Link
Chainmax
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Perfect, this is just what I need for those digicam videos I posted about a while ago. I have a suggestion though: since we're talking about a 900% upsize, wouldn't it be a better idea to use somethinglike SharpResize instead of Lanczos?
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Old 4th September 2004, 19:50   #4  |  Link
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Hmm, didn't work as well for me. Here's a comparison screenshot:



Also, here's the result of the script sh0dan recommended me to use on my thread:



and the script itself:
loadplugin("wherever\EDIUpsizer.dll")
loadplugin("wherever\MVTools.dll")
loadplugin("wherever\AddGrain.dll")
DirectShowSource(something)
converttoyv12()
selectevery(3,0)
mvback=mvanalyse(isb=true, fth=60, pel=2,sx=4, sy=4)
mvforw=mvanalyse(isb=false, fth=60, pel=2, sx=4, sy=4)
mvconvertfps(last, mvback, mvforw, fps=25.0, fbw=2, thSCD2=255, thSCD1=500)
EDIUpsizer(method=7, window=8)
addgrain(10,0,0)
EDIUpsizer(method=7, window=8)
addgrain(10,0,0)
lanczosresize(480,336)



Maybe the blocking has something to do with the fact that this is the very first frame of the clip?

Last edited by Chainmax; 4th September 2004 at 19:53.
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Old 4th September 2004, 20:41   #5  |  Link
scharfis_brain
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chainmax: the first & last frames aren't improved with my method, also I said:

- differential motion will completely mess up with that script
- if depan doesn't catch the motion, you'll get a super-motion-blurrer


so, it won't help much with your kind of clip.

it only helps with clips that
-are not that shaky (your is shaking heavily)
-have a very short shutter speed (your does)
-have no differential motion (yours has a huge amount of diff. motion)
-had been point-downscaled by the cam (yours is better scaled -> unfortunately not that suited for my algo....)

handling your clip with my method will result in an ultra-mess: 9 frames blended into another...

also:

wouldn't it be a better idea to use somethinglike SharpResize instead of Lanczos?

I only have used lanczos for the comparision.
my method internally uses pointresize as working clip
and lanczos as estimation clip.
It was the best combination


EDIT:

the result of the video, I used to build this script:
http://home.arcor.de/scharfis_brain/samples/SR1.avi


hint hint hint....

feed it with fieldseparated true interlaced video...

hint hint hint....
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Last edited by scharfis_brain; 4th September 2004 at 21:58.
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Old 4th September 2004, 23:04   #6  |  Link
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Well, I didn't know what differential motion was . While we're at it, would you want to give my clip a go?
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Old 5th September 2004, 10:30   #7  |  Link
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the only thingI could think of improving your clip a little bit, would be using depan to denoise it

you can youe my superresolution-script, if you set f=1 and r=3 and temporalsoften(r,12,20) or any other values for 12 and 20 this should remove the blockyness....

but I cannot think of more improvement

maybe a scientist with fundamental mathematical and programming knowledge could help further with this....
(I am everytime astonished by the universitary papers showing extreme improvements but not publicating binaries for testing ourselves...)
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Old 5th September 2004, 14:46   #8  |  Link
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So, technically this should make it possible to take a standard PAL/NTSC clip, and blow it up to full HD-resolution, as long as it's an panning-only shot, right?
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Old 5th September 2004, 14:50   #9  |  Link
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@Janbing: No.
a normal PAL or NTSC video is (beside the interlacing) soft scaled.
this means the moving shot has no flickering pixels (like my AVI-sample shows on its right) inside.
the pixel-flickering (due to nearest neighbor downscaling inside the cam) iscondition for using the super resolution script.

but your may use it for GMC-deinterlacing of interlaced video...
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Old 5th September 2004, 15:38   #10  |  Link
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what exactly is GMC? Apart from General Motors, of course...
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Old 5th September 2004, 19:12   #11  |  Link
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GMC = Global Motion Compensation:

depan searches for the larges moving object within the video
then depan moves the prev. and next frames, so the object of the current frame is overlaid exactly.

'normal' motion compensation is not moving thewhole frame, it either moves blocks of defined size to synthetisize a new frame or it is warping the frame as if it would be as flexible as a rubber...
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Old 6th September 2004, 09:14   #12  |  Link
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Amazing results!!!!!
Can't something "simillar" be made using MVTOOLS ???
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Old 6th September 2004, 09:39   #13  |  Link
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Sure it can. Wanted to give it a go today evening. However, for the reasons scharfis_brain mentioned, for general content the result will be more about noise reduction and artefact removal, than about "resolution enhancing".
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Old 6th September 2004, 23:15   #14  |  Link
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morsa, the script that sh0dan cooked up for me uses MVTools among other stuff. If you have any digicam videos lying around, give it a go and report back.

Didée, will your MVTools-based filter be similar to this one then?
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Old 7th September 2004, 07:46   #15  |  Link
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Quote:
Originally posted by Chainmax
Didée, will your MVTools-based filter be similar to this one then?
Hah, that was an optimist speaking.

I ran into the same problem as before, I just had "forgotten" a little about it:

I don't get clean enough temporal interpolations from the MVTools, whatever ME and other parameters I set. Problems with revealing areas, problems with vector coherence - lambda>1500 misses on contradicting motion, lambda<2000 may give vector salad, sometimes, problems with ... lots of things.

Anyone with good parameter suggestions for mvanalyse, mvconvertfps and mvcompensate, aiming for "average natural content"?
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Old 7th September 2004, 13:54   #16  |  Link
morsa
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@Didee

Yeah, I have the same problems all the time, that's why I posted this:

http://forum.doom9.org/showthread.php?s=&threadid=82015

This ugly mess gives me improved results (it is my one-track-mind way of doing an image segmentation)

vec_back = mvanalyse(last.VagueDenoiser(threshold=4,method=1,nsteps=6,chromaT=0.8,percent=100).convertToYUY2._2DCleanYUY2(0,6,3,3,0,4,4).sharpen(1.0,1.0)._2DCleanYUY2(0,6,3,3,0,4,4).convertToYV12, isb=true, pel=1)

vec_forw = mvanalyse(last.VagueDenoiser(threshold=4,method=1,nsteps=6,chromaT=0.8,percent=100).convertToYUY2._2DCleanYUY2(0,6,3,3,0,4,4).sharpen(1.0,1.0)._2DCleanYUY2(0,6,3,3,0,4,4).convertToYV12, isb=false, pel=1)

MVConvertFPS(last, vec_back, vec_forw, nb=1,fps=50.0, fbw=2,bvt=35000, thSCD1=50)

Last edited by morsa; 7th September 2004 at 15:42.
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Old 7th September 2004, 14:00   #17  |  Link
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Didée, the script I posted uses mvanalyse and mvconvertfps, why don't you try those values?
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Old 7th September 2004, 16:14   #18  |  Link
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Chainmax:
Amongst others, I tried them ...
BTW, those settings are a little obsolete. "fth" has no effect in latest version(s) (and so hasn't "sadt"). These were replaced by the "lambda" parameter (vector field coherence).

morsa:
Right method. The more artefacts the source has, the more important cleaning & enhancing major image features becomes, to give the motion engine a reasonable clean playground.

Perhaps that was the reason why I got so bad results yesterday - I was working with an overcompressed mpeg-2 source of a music concert (DVB ... )
I remember to have made some 50fps test clips of some chapters of LOTR-TTT some time ago, with quite nice results.

However, having to set up dedicated cleaning for each single source individually can't be the way eiter.
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Old 7th September 2004, 16:23   #19  |  Link
morsa
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I know....
It's just I'm a sucker with this scripting things...
Could you test this method and give an improved version?
May be some other filter does the job easier....
Anyway I hope manao read this and implements some kind of internal preprocessing (may be a bilateral filter with strong settings could do the job)

That thing I've posted above is giving me perfect results, not even a block!!!!!!!
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Old 7th September 2004, 16:52   #20  |  Link
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A little bird flew along and sang the song of "Manao is overbusy with other important things these days"

(And I'm sure we all will love ... it )
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