Strong halos (black/white)

[Mounir]

I can't seem to get rid off these black/white halos due to oversharpening. I've tried various dehalo filters without much success (unless i missed something ?). Thanks for your inputs

video sample DL Here (https://mega.co.nz/#!A9ZVnAjS!5V9kjgjeqdowGmPt0IWh-_i5Ym4-3ixd5Kc8NC5FcE4)

[Mounir]

anyone ? please. I've tried finedehalo, it's not bad but not quite enough and only work on dark parts

[StainlessS]

Is this any good, http://avisynth.nl/index.php/UnFilter

UnFilter is a simple and reasonably fast Avisynth Soften/Sharpen filter.

It implements 5-tap user adjustable horizontal and vertical filters designed to (slightly) reverse previous efforts at softening or edge enhancement that are common (but ugly) in DVD mastering. Since DVDs were intended originally for interlaced displays this has caused content providers to vertically filter them even a bit more to hide interlacing artifacts. They sometimes overdo the edge enhancement.

When softening it will attempt to approximate the inverse of a simple 3-tap edge enhancement filter. When sharpening it will attempt to approximate the inverse of a simple 3-tap softening filter. For the math and logic involved see the comments in the UnFilterALL.inc member included in zip file.

The effects are fairly mild but be aware that excessive sharpening makes things harder to compress and may bring about the dreaded "edge enhancement artifacts" the people complain about in DVDs from some studios. And while excessive softness may hide noise it loses detail and generally just looks ugly. So it is probably best to just try to reverse whatever has already been done to your source.

Have never tried it. Dont know of any other 'reverse sharpeners'.

[Mounir]

Unfilter essentially blur the whole image on the x or y axis and i only want to blur black/white lines along the edges.
Can i achieve that with some other filter maybe (unfilter+masks or something ?)

[EHarlen]

Have you tried HaloBuster?

http://forum.doom9.org/showthread.php?t=172599

[Dreamland]

I think Halobuster is great for halos and to preserve quality video!

[feisty2]

Have you tried HaloBuster?

http://forum.doom9.org/showthread.php?t=172599

that version is obsolete..
I have stopped support to all my avisynth stuff
I'm 100% vaporsynth now

[Mounir]

I've tried with edges masks but frankly it's not worth it:

avisource()
main=last
main
Halobuster() #(or whatever dehalo filter)
filtered=last
main
mt_edge().mt_expand
mymask=last
mt_merge(main, filtered, mymask)

[feisty2]

...
#code from halobuster
mask = TCannyMod (converttoyv12 (clean.ditherpost (mode=-1)), sigma=1.5, mode=1, gmmax=50)
...


tell me it isn't edge masking

[Reel.Deel]

I can't seem to get rid off these black/white halos due to oversharpening. I've tried various dehalo filters without much success (unless i missed something ?).]

No surprise there, these are not your typical halos. Have you tried any of the ghost removal (http://avisynth.nl/index.php/External_filters#Ghost_Removal) filters? WarpSharp (http://avisynth.nl/index.php/WarpSharp) includes a ghost removal filter also.

[cretindesalpes]

Quick & dirty halo removal. Will introduce some blurriness, but the halos are so huge you can’t avoid it.
h = Height ()
w = Width ()
cy = BicubicResize (w / 8, h, 1, 0).BicubicResize (w, h, 1, 0)
cmd = mt_makediff (cy)
cm = cmd.mt_lut ("x 134 > 255 x 122 < 255 0 ? ?")
cr = last.Merge (cy, 0.8)
mt_merge (last, cr, cm, y=3, u=2, v=2)
You can play with the blur radius (w / 8), thresholds (122 for dark halos and 134 for bright halos) and blur mix (0.8)

[Mounir]

hmm yeah that's very blurry.

What about a repaint filter ?
Detect the real edges, Detect the halos (black/white) use the colours outside the halos to repaint inward

[sephirotic]

Some experienced encoders use a technique of strong dehalo, producing whiteish/bright secondary halo artifacts. To remove these secondary halos, they them use a prefilter technique of comparing a blured prefilter image of the picture and masking the brighter differences. I have no idea how to implement that, tough, but the results I saw, were amazing.

[EHarlen]

Some experienced encoders use a technique of strong dehalo, producing whiteish/bright secondary halo artifacts. To remove such halos, they them use a prefilter technique of comparing a blured prefilter image of the picture and masking the brighter differences. I have no idea how to implement that, tough, but the results I saw, were amazing.

What encoders do this?

[StainlessS]

Some experienced encoders

What encoders do this?

Perhaps sephirotic is referring to 'people' (the word 'experienced' might suggest that he means persons rather than software).

EDIT: And sephirotic post looked to me just like script posted by cretindesalpes.

[sephirotic]

What encoders do this?

Fussoir and Yurasyk.

[feisty2]

To remove these secondary halos, they them use a prefilter technique of comparing a blured prefilter image of the picture and masking the brighter differences.


mt_lut(mt_makediff(blur(1),last),"x 128 > 255 0 ?")

no sweat