View source for SmoothD

{{FilterCat4|External_filters|Plugins|Restoration_filters|Deblockers}}
{{Filter3
|Tobias Bergmann
|0.0.9pre2
|3=[http://www.funknmary.de/bergdichter/projekte/video/SmoothD/releases/SmoothD009pre2_src.zip SmoothD009pre2_src.zip]
|4=Deblocker
|5=[http://www.gnu.org/licenses/gpl-2.0.txt GPLv2]
|6=[http://forum.doom9.org/showthread.php?t=84355 Doom9 Thread]}}

==Description==
[[SmoothD]] filters the input stream by repeated application of a DCT-quant-iDCT on shifted copies of each frame. By doing so it reduces blocks while keeping high frequency detail intact.
Ideally it should be used with exactly the same quant matrix as the stream was produced with. In order to keep the list of parameters small and usage simple Didée's 6-of-9 matrix is used. This matrix offers very light filtering at low quants. See [http://www.funknmary.de/bergdichter/projekte/video/SmoothD/ official documentation] for more information.
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== Requirements ==
* AviSynth 2.5.8 or [http://sourceforge.net/projects/avisynth2/ greater]
* [[FAQ_different_types_content#How_do_I_recognize_progressive.2C_interlaced.2C_telecined.2C_hybrid_and_blended_content.3F|Progressive]] input only 
* Supported color formats: [[YV12]]
*[[MMX]] capable CPU
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== [[Script variables|Syntax and Parameters]] ==
:{{FuncDef|SmoothD (clip clip, int "quant", int "num_shift", int "adaptive_shift", int "zero_weight")}}
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::{{Par2| |clip| }}
:::Input clip.
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::{{Par2|quant|int|3}}
:::This parameter specifies the quantizer value used (1 to 31). A higher value means stronger filtering. It should be set according to the quality of the stream. The value should be chosen to match the stream quality with an (imaginary) Didée's 6-of-9 constant quant encode.
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::{{Par2|num_shift|int|4}}
:::Specifies the number of shifted versions used for filtering (1 to 8). A higher value is both more accurate and time consuming.
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::{{Par2|adaptive_shift|int|0}}
:::Selects if adaptive shifting is used (0 or 1). Zero means off. Adaptive shifting varies num_shift depending on quant.
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::{{Par2|zero_weight|int|1}}
:::Defines relative weight of non-shifted original (1 to 8). A higher value counteracts filtering but keeps more detail.
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==Examples==
SmoothD with default settings:
 MPEG2Source("Blocky.dv2")
 SmoothD(quant=3, num_shift=4, adaptive_shift=0, zero_weight=1)

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==External Links==
*[http://forum.doom9.org/showthread.php?t=84355 Doom9 Forum] - SmoothD discussion.
*[http://www.aquilinestudios.org/avsfilters/spatial.html#smoothd Aquiline Studios] - SmoothD additional information.
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