Retinex

[FranceBB]

Originally Posted by kedautinh12

Avisynth-retinex
https://github.com/Asd-g/AviSynth-Retinex

Not bad, considering it's doing everything automatically...

Here's a test with a v210 losslessly captured tape:

AVISource("Q:\00_INGEST_MAM\A.R.C.A\00_FILE_DA_ENCODARE\CALCIO SERIE A 1999 2000 TORINO VS ROMA SUPERSLOMO 991024 7769614.avi")
Bob()
ConvertBits(16)
ConvertToPlanarRGB()
original=Subtitle("Original")

filtered=MSRCR(sigma=250, lower_thr=0.001, upper_thr=0.001, fulls=true, fulld=true, restore=125.0).Subtitle("MSRCR")

StackHorizontal(original, filtered)

[Emulgator]

FranceBB, did you swap pictures by any chance ?

[FranceBB]

Originally Posted by Emulgator

FranceBB, did you swap pictures by any chance ?

This is what happens when I have a break at work, go to doom9, find something interesting and then people interrupt me halfway through 'cause they call me at my phone xD
The text doesn't match the picture in the script I wrote, so now I don't know which one is which. Dang it.

[Selur]

Usually the brighter one is the Retrinex output,...
Using Retinex in Vapoursynth with "clip = core.retinex.MSRCP(input=clip, sigma=[25,80,250], fulls=True, fulld=True)"
gives for example:


So I think the labeling is correct and the right side (like in my screenshots) is the filtered side.

Cu Selur

[FranceBB]

Originally Posted by Selur

I think the labeling is correct and the right side (like in my screenshots) is the filtered side.

Good!

Originally Posted by Selur

Ah, that's funny, it's a Sky Deutschland feed eheheheh

[StainlessS]

So, it's supposed to make them look too bright ?

[wonkey_monkey]

Originally Posted by StainlessS

So, it's supposed to make them look too bright ?

Seems to be a left-right gradient on them (FranceBB's) too.

Edit: it seems like we've polluted the "New Plugins and Utilities" thread quite a bit here, by the way...

[kedautinh12]

I think it's same HDR

[Selur]

Can't really say what it should do, since I only used it to brighten up some way to dark indoor captures, where it really helped.
Looks like it's main effect is to brighten up dark areas and even out the general brightness of an image, so it might not be that suited for movies but more for single to dark scenes.

Here's another example (also using the default settings):

Edit: it seems like we've polluted the "New Plugins and Utilities" thread quite a bit here, by the way...

Argh, may be a mod could split the retinex discussion into a different thread,...

I think it's same HDR

Hmm, to me it seems more like the complete opposite to high dynamic range,...

Cu Selur

[FranceBB]

Originally Posted by Selur

Hmm, to me it seems more like the complete opposite to high dynamic range...

It's pretty much the same as "fake HDR" when in mobile phones you choose "HDR" and you bump the slide to the maximum so it exasperates the shadows ehehehehe

Anyway, yes, it makes everything brighter.

[wonkey_monkey]

The rocks in Selur's example have got darker.

[Selur]

It's pretty much the same as "fake HDR" when in mobile phones you choose "HDR" and you bump the slide to the maximum so it exasperates the shadows ehehehehe

I mainly use my phone for navigation and checking mail, never really used it for anything video related.

Anyway, yes, it makes everything brighter.

I agree with wonkey_monkey, that does not seem to be the case.

For the fun of it I tool your first screenshot cropped by 720 on the right and then applied Retinex (Vapoursynth):


Cu Selur

[wonkey_monkey]

Is that gradient due to the NAB bars on the sides?

[Selur]

This is what it looks like if I crop all the black bars (CropRel(clip=clip, left=12, right=732, top=0, bottom=2)) and then apply Retinex:

so I would say: Yes
-> when using Retinex one should crop first.

Cu Selur

[Sharc]

For black, unfiltered (noisy) VHS frames I am getting this ugly patchwork out of retinex. Happens for example with fade-in/fade out.

[IMG][/IMG]

[wonkey_monkey]

Originally Posted by Selur

This is what it looks like if I crop all the black bars

so I would say: Yes

Hmm. Can't help thinking it's indicative of a bug, even if it goes away when cropped. The bars are fairly equal, so why does the left get bright but the right doesn't? Odd.

[tormento]

I am trying to use Retinex to remove color cast from a old film movie, unfortunately it has the tendency to brighten too much the dark photograms and cast sort of halo around objects.

Is there a way to limit it?

My script

SetMemoryMax()
SetFilterMTMode("DEFAULT_MT_MODE", 2)
LoadPlugin("D:\Eseguibili\Media\DGDecNV\DGDecodeNV.dll")
DGSource("F:\In\1_48 Fantozzi\fantozzi.dgi",ct=24,cb=24,cl=0,cr=0)
ConvertBits(16)
SMDegrain (tr=6, thSAD=600, refinemotion=true, contrasharp=false, PreFilter=4, plane=4, chroma=true)
ConvertToPlanarRGB()
MSRCR(sigma=250, lower_thr=0.001, upper_thr=0.001, fulls=true, fulld=true, restore=125.0)
ConvertToYUV420()
fmtc_bitdepth (bits=8,dmode=8)
Prefetch(6)

Results:

[kedautinh12]

If your old film movie have black bars, just cut before use retinex and add border again

[tormento]

Originally Posted by kedautinh12

If your old film movie have black bars, just cut before use retinex and add border again

I always crop black bars.

[StvG]

Originally Posted by tormento

I am trying to use Retinex to remove color cast from a old film movie, unfortunately it has the tendency to brighten too much the dark photograms and cast sort of halo around objects.

Is there a way to limit it?

Try with very high sigma. For example sigma=2500.