DeHalo alpha

Abstract
Author	Didée
Version	MT2
Download	DeHalo_alpha_MT2.avsi
Category	Dehalo
License
Discussion	Doom9 Thread

Description

Reduce halo artifacts that can occur when sharpening.

Requirements

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

Required Plugins

Latest versions of the following filters are recommended unless stated otherwise.

• MaskTools2
• Repair - part of the RemoveGrain v1.0b package.
• RgTools - recommended drop-in replacement for Repair!

Syntax and Parameters

DeHalo_alpha (clip clp, float "rx", float "ry", float "darkstr", float "brightstr", float "lowsens", float "highsens", float "ss")

clip  clp =

Input clip.

float  rx = 2.0

float  ry = 2.0

As usual, the radii for halo removal.

Note: This function is rather sensitive to the radius settings. Set it as low as possible! If radius is set too high, it will start missing small spots.

Range: 1.0 to 3.0

float  darkstr = 1.0

float  brightstr = 1.0

The strength factors for processing dark and bright halos. Default 1.0 both for symmetrical processing.

On Comics/Anime, darkstr=0.4~0.8 sometimes might be better ... sometimes. In general, the function seems to preserve dark lines rather well.

Range: 0.0 to 1.0 [<0.0 and >1.0 possible]

int  lowsens = 50

int  highsens = 50

Sensitivity settings, not that easy to describe them exactly ...

In a sense, they define a window between how weak an achieved effect has to be to get fully accepted, and how strong an achieved effect has to be to get fully discarded.

Defaults are 50 and 50 ... try and see for yourself.

Range: 0 to 100

float  ss = 1.5

Supersampling factor, to avoid creation of aliasing. ss=1.0 -> no supersampling.

Range: 1.0 to ???

Examples

DeHalo_alpha with default values.

AviSource("Blah.avi")
DeHalo_alpha(rx=2.0, ry=2.0, darkstr=1.0, brightstr=1.0, lowsens=50, highsens=50, ss=1.5)

Changelog

 Changes 2006-01-31:
     - Changed syntax to use MaskTools2

 Changes 2005-11-15:
     - Initial release

External Links

• Doom9 Forum - DeHalo_alpha discussion.
• Doom9 Forum - Modified DeHalo_alpha: here with increased search-radius for validation.
• Doom9 Forum - DeHalo_alpha with contra-sharpening. DeHalo_alpha_cs.avsi by Desbreko.

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