View source for UnDot

{{FilterCat4|External_filters|Plugins|Restoration_filters|Spatial_denoisers}}
{{Filter3
|{{Author/Tom Barry}}
|v0.0.1.1
|[http://web.archive.org/web/20130207143129/http://neuron2.net/trbarry/UnDot.zip UnDot.zip]
|Spatial denoisers
|[http://www.gnu.org/licenses/gpl-2.0.txt GPLv2]
|6=[http://forum.doom9.org/showthread.php?s=&postid=205442#post205442 Doom9 Thread]}}
== Description ==
UnDot is a simple median filter for removing dots, that is stray orphan pixels and mosquito noise. It basicly just clips each pixel value to stay within min and max of its eight surrounding neighbors.
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<span style="color:red">'''Note: [[RgTools]] is recommended as a modern replacement for Undot. [[RgTools/RemoveGrain|RemoveGrain(mode=1)]] is identical to <code>Undot()</code>'''</span>
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== Requirements ==
* AviSynth 2.5.8 or later 
* Supported color formats: [[YUY2]], [[YV12]]

* [[SSE]] / [[MMX]] compatible CPU
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== [[Script variables|Syntax and Parameters]] ==
:{{Template:FuncDef|UnDot (clip)}}
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::{{Par2| |clip| }}
:::Input clip; In YV12 mode, UnDot filters both luma and chroma; however, in YUY2 mode, it only filters luma. 
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::UnDot's theory of operation is very simple: it clips each pixel to stay within the minimum and maximum values of its eight spatial neighbors (pure minmax clipping, therefore identical to <code>RemoveGrain(mode=1)</code>). This doesn't produce a very visible effect at all, but it helps compressibility. Because UnDot can be used without losing any details* and with hardly any speed penalty, it's a good filter to use before other smoothers.
::*  * '''Exception''': Do NOT use UnDot if your video contains any dither dissolves. Since these rely on single isolated pixels being from a different clip than those around them, UnDot will destroy the effect by whipping those deviant pixels into line with their surroundings. 
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== Examples ==
 [[AviSource]]("Blah.avi")
 UnDot()
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== Changelog ==
 Version       Date            Changes<br>
 v0.0.1.1      2003/01/18      - Use AviSynthPluginInit2
 v0.0.1.0      2002/11/03      - Initial test release for AviSynth 2.5 alpha only
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== Archived Downloads ==
{| class="wikitable" border="1"; width="600px"
|-
!!width="100px"| Version
!!width="150px"| Download
!!width="150px"| Mirror
!!width="150px"| Mirror 2
|-
!v0.0.1.1
|[http://web.archive.org/web/20130207143129/http://neuron2.net/trbarry/UnDot.zip UnDot.zip]
|[http://web.archive.org/web/20050305060602/http://mywebpages.comcast.net/trbarry/UnDot.zip UnDot.zip]
|[http://avisynth.nl/users/warpenterprises/files/undot_5F25_dll_20030118.zip undot_25_dll_20030118.zip]
|}
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== External Links ==
*[http://web.archive.org/web/20101228041140/http://neuron2.net/trbarry/Readme_UnDot.txt Archive.org] -  Original archived documentation.<br>
*[http://www.aquilinestudios.org/avsfilters/spatial.html#undot AquilineStudios] - UnDot additional information.

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'''Back to [[External_filters#Spatial_Denoisers|External Filters]] &larr;'''