VerticalCleaner

Abstract
Author	Kassandro
Version	v0.1
Download	VericalCleaner.rar
Category	Spatial Denoisers
License	GPLv2
Discussion	VideoProcessing Forum

Description

A fast vertical median plugin which comes in 4 versions:

Name	Comments
VerticalCleanerS.dll	Statically linked SSE version.
VerticalCleaner.dll	Dynamically linked SSE version.
VerticalCleanerSSE2.dll	Dynamically linked SSE2 version.
VerticalCleanerSSE2.dll	Dynamically linked SSE3 version. [NOT RECOMMENDED]
*VerticalCleanerSSE2.dll is highly recommended as it's considered to be the most compatible and stable.

Requirements

• AviSynth 2.5.8 or later
• Progressive input only
• Supported color formats: YUY2, YV12

• MSVCR80.DLL

Syntax and Parameters

VerticalCleaner (clip, int "mode", bool "planar")

clip   =

Input clip.

int  mode = 2

Modes:

• 0 : copy input
• 1 : vertical median
• 2 : relaxed vertical median (preserves more detail)
  

bool  planar = false

See SSETools Interleaved2Planar.

Description of Modes

Written by Kassandro

Let b1, b2, c, t1, t2 be a vertical sequence of pixels. The center pixel c is to be modified in terms of the 4 neighbours. For simplicity let us assume that b2 <= t1. Then in mode 1, c is clipped with respect to b2 and t1, i.e. c is replaced by max(b2, min(c, t1)). In mode 2 the clipping intervall is widened, i.e. mode 2 is more conservative than mode 1. If b2 > b1 and t1 > t2, then c is replaced by max(b2, min(c, max(t1,d1) )), where d1 = min(b2 + (b2 - b1), t1 + (t1 - t2)). In other words, only if the gradient towards the center is positive on both clipping ends, then the upper clipping bound may be larger. If b2 < b1 and t1 < t2, then c is replaced by max(min(b2, d2), min(c, t1)), where d2 = max(b2 - (b1 - b2), t1 - (t2 - t1)). In other words, only if the gradient towards the center is negative on both clipping ends, then the lower clipping bound may be smaller.
In mode 1 the top and the bottom line are always left unchanged. In mode 2 the two first and the two last lines are always left unchanged.

Examples

VerticalCleaner with default values:

AviSource("Blah.avi")
VerticalCleaner(mode=2, planar=false)

Changelog

2008-02-28 :
 - Initial release

Links

• VideoProcessing Forum - Parameter description by Kassandro.
  
• VideoProcessing Forum - Mode 2 explanation by Kassandro.

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