Remove Streak noise from an old betamax video with Avisynth+

[banaguitar]

Hello,

is there any chance to remove the vertical nose in this video here?

https://drive.google.com/file/d/1qmyGVAAGZygdbAvoUmv-jRTVNMbpS8SG/view?usp=sharing

And how?

Thanks a lot!

[Selur]

I that highly compressed file your source?
(totally oversharpened, chroma bleeding, ... )
YAHR (or some other dehaloing) + SpotLess + CCD + some chroma shaprening with aWarpSharp2 is probably worth a try,...

Cu Selur

Ps.: I would recommend recapturing if possible, if this is your source.

[banaguitar]

No, it's not the source. I only de-interlaced the avi source, nothing more.

[lollo]

No, it's not the source. I only de-interlaced the avi source, nothing more.

Post the source, and Selur will help for sure...

[banaguitar]

Ok, give me a few days please.

[jagabo]

Downscale to about 440x576 then upscale back to 720,576. The smaller the downscale size the better the noise reduction, but the blurrier the picture gets. You can also combine that with a mask that limits the blurring to areas with obvious vertical stripes or highly saturated areas.

[jagabo]

Here's a script that uses a mask to apply the blurring only to saturated areas:

##########################################################################


function SaturationMask(clip c)
{
    U = UtoY(c)
    V = VtoY(c)
    mt_lutxy(U, V, expr="x 128 - abs 2 * dup *    y 128 - abs 2 * dup *   + 0.5 ^")
    PointResize(c.width, c.height)
}

##########################################################################

LWLibavVideoSource("Sample.mp4") 
src = last
smask = SaturationMask().ColorYUV(gain_y=2000, off_y=-500)

Spline36Resize(360, height).Spline36Resize(width,height)
Sharpen(0.5, 0.0)
Overlay(src, last, mask=smask)