Checkmate

Abstract
Author	mf / prunedtree
Version	2006-03-04
Download	checkmate.dll
Category	Rainbow & Dot Crawl Removal
License	Closed source

Description

Spatial and temporal dot crawl reducer. Checkmate is most effective in static or low motion scenes. When using in high motion scenes (or areas) be careful, it's known to cause artifacts with its default values.

Requirements:

- AviSynth 2.5.8 or later

- Supported color formats: YV12

Syntax and Parameters

checkmate (clip, int "thr", int "max", int "tthr2")

int  thr = 12

Spatial threshold:

Controls the spatial filter, higher values will blend more but cause artifacts if set too high.

If set too low, lines in static scenes where dot crawl was reduced will become slightly more blurry.

int  max = 12

Controls the maximum amount by which a pixel's value may change. Higher values will increase the strength of the filtering but cause artifacts if set too high.

int  tthr2 = 5

Temporal threshold:

Controls the temporal blending; higher values will blend more but cause artifacts if set too high.

Setting this to 0 disables the temporal blending entirely. This may be helpful to reduce temporal artifacts in high motion scenes.

Note: Official documentation was never released. A valid range is unknown for all parameters. It's probably best to set those values not too distant from their defaults.

Examples

Checkmate with default values:

MPEG2Source("DotCrawl.d2v")
checkmate(thr=12, max=12, tthr2=5)

Processing luma with tthr2=0 and chroma with default values. Helps avoid unwanted artifacts in the luma channel (Y).

input  = MPEG2Source("DotCrawl.d2v")
chroma = input.checkmate()
luma   = input.checkmate(tthr2=0)
final  = luma.MergeChroma(chroma)

- Suggested by scharfis_brain and it's also known as DeCrow()

Links

• Scintilla's Guide - Unofficial documentation
• Doom9 Forum - Archived download.
• VideoHelp - Archived download.

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