DeScratch plugin for film line scratch removing

[Fizick]

Dear killer,

1. All scratches marked by Descratch on your example are weak scratches, which will NOT be cleaned.

2. Only strong (with dif > mindif) and long (length > minlen) scratch will be cleaned by Descratch.
It would be marked by deep black.

3. IMHO, I do not see any line on you example for Descratch.
Try DeGrainMedian instead.
or some other filter (fft3d ?).

[killer_jaime11]

Hi Fizick
Thanks for answering that quickly, I've been trying to tune your filter starting off with the parameters on your page but I don't get the right settings, I've tried increasing mindif and minlen to get less detection, also I turned on the modeU and modeV and put mindifUV=0 so it gets mindif. But the problem is that the scratches that I want to be removed don't get removed, scratches like this:



This is the only kind of scratch I need to remove from my clip. What settings do you suggest me to use Fizick?? Also I'm getting detected other parts of the clip which aren't scratches. The Avisynth code used is:

#Fizick's DeSpot
loadplugin("C:\Archivos de programa\AviSynth 2.5\plugins\descratch.dll")
ConvertToYV12(interlaced=true)
crop(0,0,-0,288) # select top part of frame to save screen space
input=last
assumetff()

separatefields() # for analog interlaced source
turnleft()
descratch(mindif=4,maxgap=20,minlen=110,blurlen=50,keep=100,border=0,maxangle=0.0,modeU=1,modeV=1,mindifUV=0, mark=false)
turnright()
weave() # restore fields
# Compare source frame and frame after scratch removing
StackVertical(input,last)

Also, I've noticed a strange image, see what I've got:



No idea why the face of the man is distorted, I thought it could be because of the detection marking but it's turned off.
Thanks in advance

[Fizick]

One user (UFFE) sent to me this e-mail.

Some video sources like Laserdiscs sometime have spots and scratchs that are almost the same size all the time, but if you try to remove them with despot or descratch you often get many false corrections. I would like to know if it is possible to add these functions:
A "maxlen" parameter for descratch to determin the maximum length of a scratch, this could be very usefull if you only want to remove scratches that are almost the same length.
"minpwidth" and "minpheight" parameters for despot to determin the minimum size of a spot, this could be very usefull if you only want to remove spots that are almost the same size.

So, now I release Descratch Version 0.8, March 13, 2005 - added maxlen parameter

[grannyGeek]

Souce clip has many vertical scratches & lines, looks a lot like the screenshot in DeScratch guide.
I tried the small sample script in the guide,

AviSource("whatever.avi")
LoadPlugin("descratch.dll")
ConvertToYV12()
DeScratch(lumadif=2)

Using in VirtualDubMpeg2, and it won't load, gives error message
"DeScratch does not have named argument "lumadif"


Which current parameter replaced lumadif ?
Or is that an obsolete setting now?

what would be the simplest script for DeScratch?

Thanks for any help.

[Fizick]

mindif
I fixed the doc (and released the source code)

[grannyGeek]

Thank you sir!
appreciate your filters more than I can say
I'm still bragging about my good results with DeSpot

[marknyc5]

I've created an avs file, but see no effect at all. I've been trying different scripts and here is the latest. This is for a black and white film with black vertical scratches. What am I doing wrong in the script?

Thanks for any help!

Mark

DirectShowSource("lemonade.avi")
LoadPlugin("descratch.dll")
ConvertToYV12()
DeScratch(mindif=5)
DeScratch(maxgap=55)
DeScratch(keep=0)
DeScratch(mark=true)

[Emulgator]

You will not want to call Descratch 4 times in row with only one parameter.
I guess you will want to call Descratch only once with your 4 parameters separated by commas.

The Descratch.html gives examples. Like

DeScratch(mindif=4, maxgap=20, minlen=300, blurlen=50, keep=100, border=0, maxangle=0)

Besides there are many occasions where Descratch will find nothing. The scratch width is still limited to 1 pixels or 3 pixels.

[Bernardd]

Hello Fizick,

Thanks you for the last release of Descratch. The strach corrections are now very good, it is difficult with a picture tool like Gimp to get faster and better correction.
The new args left and right are genius. With them, it is more easy to find a common tune of values for long frames serial.

I believe it would be more perfect, if the no process area would be between rigth and left, when arg left is superior than arg right.

Thanks

[Transatlantic]

I have been using Descratch for some time on Super 8 mm and 8 mm restoration projects.

I was quite pleased, although there were cases where it was inapplicable, especially if the scene contained a number of vertical objects, such as a fence or vertical posts.

I had noticed that vertical scratches very often appear in the same area of the image. In my case on the right hand side of the image. This is probably due to mechanical friction in movie projectors.
It is only recently that I realized that Descratch was updated to version 1.1 to include “right” and “left” parameters (amongst other improvements).

This is just what I dreamed of! I can now apply more aggressive parameters to the scratched area without risking false detections in other areas.

This is a vast improvement. And setting the right parameters is much easier, because you can concentrate on the area containing scratches, and disregard the area that does not contain scratches…

Other improvements are also welcome, such as more “maxwidth” values… and “more smooth scratch borders removing”.

Thank you very much for this excellent updated version!

By the way, there is one parameter that is still some sort of mystery to me: that is “asym”. I have not been able to make out what it actually does and how to tweak it. Maybe it is difficult to explain in words, but easy with a picture… Can anyone explain, or show this on a picture?

Patrick

from Brittany, France

[kedautinh12]

Latest ver Adds YV16 and YV24 support.
https://github.com/vapoursynth/descratch/releases

[tormento]

Originally Posted by kedautinh12

Latest ver Adds YV16 and YV24 support.

Dues it work for AVS+ too?

[ChaosKing]

"Note that in VapurSynth all arguments are fully lowercased. Also comes with Avisynth support."

[kedautinh12]

Note: "A combined VapourSynth+Avisynth verion of the the DeScratch filter written by Fizick"