DeScratch
| Abstract | |
|---|---|
| Author | Fizick, Myrsloik |
| Version | r1 |
| Download | descratch-r1.7z |
| Category | Film Restoration |
| License | GPLv2 |
| Discussion | Doom9 Forum |
Contents |
Description
This plugin removes vertical scratches from films. Also it can be used for removing of horizontal noise lines such as drop-outs from analog VHS captures (after image rotation).
- See official documentation: http://www.avisynth.nl/users/fizick/descratch/descratch.html
Requirements
Syntax and Parameters
- descratch (clip, int "mindif", int "asym", int "maxgap", int "maxwidth", int "minlen", int "maxlen", float "maxangle", int "blurlen", int "keep", int "border", int "modeY", int "modeU", int "modeV", int "mindifUV", bool "mark", int "minwidth", int "left", int "right")
- clip =
- Input clip.
- clip =
- int mindif = 5
- Minimal difference of pixel value in scratch from neighbours pixels for luma plane.
- Range: from 1 to 255, default 5
- int mindif = 5
- int asym = 10
- Maximal asymmetry of neighbors pixels
- Range: from 0 to 255, default 10
- int asym = 10
- int maxgap = 3
- Maximal vertical gap to be closed.
- Range: from 0 to 255, default 3
- int maxgap = 3
- int maxwidth = 3
- Maximal scratch width.
- Range: odd numbers from 1 to 15, default=3
- int maxwidth = 3
- int minlen = 100
- minimal scratch length, (default = 100).
- int minlen = 100
- int maxlen = 2048
- Maximal scratch length, (default = 2048).
- int maxlen = 2048
- float maxangle = 5.0
- Maximal angle to vertical (in degrees, default = 5.0).
- float maxangle = 5.0
- int blurlen = 15
- Radius of vertical blur for frame analysis (default = 15).
- int blurlen = 15
- int keep = 100
- Percent of scratch detail to keep (default = 100).
- int keep = 100
- int border = 2
- Thickness of border near scratch for partial restoration (default = 2).
- int border = 2
- int modeY = 1
- Processing mode for luma plane (0 - no, 1 - low(black), 2 - high(white), 3 - both, default=1).
- int modeY = 1
- int modeU = 0
- Processing mode for chroma U plane (0 - no, 1 - low(green), 2 - high(red), 3 - both, default=0).
- int modeU = 0
- int modeV = 0
- Processing mode for chroma V plane (0 - no, 1 - low(yellow), 2 - high(blue), 3 - both, default=0).
- int modeV = 0
- int mindifUV = 0
- Minimal difference of pixel value in scratch from neighbours pixels for chroma planes.
- Range: from 0 to 255, default 0:
- if = 0, then internal
mindifUVvalue is same asmindif.
- if = 0, then internal
- int mindifUV = 0
- bool mark = false
- Mark scratch in debug mode (true or false, default = false).
- (set rejected extrems pixels to grey, set scratches pixels to white or black)
- bool mark = false
- int minwidth = 1
- Minimal scratch width.
- Range: odd numbers from 1 to 15, default=1
- int minwidth = 1
- int left = 0
- Left margin of processing window (inclusive), default=0.
- int left = 0
- int right =
- Right margin of processing window (exclusive), default=frame width or 4096.
- int right =
- Parameters
maxgap, maxwidth, minwidth, minlen, blurlen, border, left, rightshould be given in pixels.
- Parameters
How It Works
The plugin firstly detects scratches, then removes them.
It uses spatial information only from current frame.
I adapt it to restoration of my old 8 mm films, may be it will be useful to somebody else.
Scratch detecting
Apply some vertical blur to frame copy, for suppression of image thin structure, inclined lines and noise.
Search for local extremes of luma in every row with luma difference criterion for scratches with width not above a max.
Put these extremes in some map (frame). Search and deactivate extrems for width below a min (optional).
Optionally close vertical gaps in extrems by vertical expanding of extreme points.
Test the extremes map with length and angle criterions, so select real long scratches only.
Scratch removing
Scratches may be either partially transparent, smooth (with image details), or opaque (with no details or almost destroyed).
In the first case, plugin can subtract smooth (blurred) part of luma scratches variation from original image. Therefore, image details are kept.
In the second case, plugin replaces scratched pixels by mean luma values from some neighbours pixels (in same row).
We have also intermediate case by setting some percent of detail to keep.
In all cases, some nearest neighbours pixels may be also partially changed for smooth transition.
Examples
descratch default settings:
AviSource("Blah.avi") descratch ()
You MUST tune parameters for your video.
Use AviSynth commands Greyscale(), UtoY(), VtoY(), and mark parameter for debug and tuning.
Archived Downloads
| Version | Download | Mirror |
|---|---|---|
| v1.1.0 (x86/x64) | DeScratch110.7z | DeScratch110.7z /// MediaFire |
| v1.1.0 | descratch110.zip | descratch110.zip |
- x86/x64 version compiled by Groucho2004.
External Links
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