DeGrainMedian

Latest revision as of 08:49, 9 February 2023

[edit] Description

DeGrainMedian is a spatio-temporal limited median filter mainly for film grain removal, but may be used for general denoising. For additional information see the official documentation.

[edit] Requirements

• AviSynth 2.5.8 or greater
• Supported color formats: YUY2, YV12
• SSEMMX (Integer SSE) capable CPU

[edit] Limitations

• No scenechange detector in current version. But I do not see any ghosting - filter is switched to spatial pixel pairs.
• First and last line (line pair for interlaced) of every frame are not filtered.
• First and last 8 (YV12) or 4 (YUY2) pixels in every row are filtered with more simple (same columns) method.
• Chroma filtering in YUY2 mode is also in same columns only.
• First and last frames are not filtered.

[edit] Syntax and Parameters

DeGrainMedian (clip, int "limitY", int "limitUV", int "mode", bool "interlaced", bool "norow" )

clip   =

Input clip.

int  limitY = 4

int  limitUV = 6

Limit of pixel luma(Y) and chroma(UV) correction (0 to 255).

int  mode = 1

Operation mode (0 to 5, the more, the weaker)

bool  interlaced = false

Process clip as interlaced.

bool  norow = false

Do not use same row in spatial filter.

[edit] Examples

DeGrainMedian with all default values:

AviSource("Blah.avi")
DeGrainMedian(limitY=4, limitUV=6, mode=1, interlaced=false, norow=false)

[edit] Changelog

Version      Date(D/M/Y)     Changes

v0.8.2       07/10/2006      - Fixed a green right border bug for non-mod 8 width. Thanks to akapuma for report.

V0.8.1       28/07/2006      - Fixed a bug for mode>0, interlaced=true, norow=false, YV12. Thanks to squid_80 for report.

v0.8         09/10/2005      - Changed frame cache range to 3.
                             - Added option norow to disable using same row (horizontal) spatial pair.
                             - Fixed documentation error about mode=1.
                             - Renamed old mode 4 to 5, 3 to 4, 2 to 3, added new mode 2.

v0.7.0       27/07/2005      - Reformatted documentation only.

v0.7         21/04/2005      - Fixed bug with mode=2 for YV12 interlaced; first frame pitch fixed.

v0.6         02/04/2005      - Fixed some bugs with YUY2. Thanks to AVIL for report.

v0.5         23/03/2005      - Use more correct cache settings. Thank to Turyst04 for stability problem report.

v0.4         10/11/2004      - Fixed possible bug with different frame pitches.

v0.3         28/08/2004      - Added interlaced mode, code reorganization

v0.2         21/08/2004      - Added more safe modes=1-4, doc updated. 

v0.1.1       18/08/2004      - Bug fixed with spatial part of YV12 (distance was 2 pixels).

v0.1         13/08/2004      - First public (beta!).

[edit] Archived Downloads

[edit] External Links

• AquilineStudios - DeGrainMedian additional information.

Back to External Filters ←