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Old 27th May 2011, 07:46   #1  |  Link
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Posts: 218
flash3kyuu_deband 1.5.1 / 2.0pre2 with native VapourSynth support [2012-12-03]

Hi all,

I've ported a deband filter for AviUtl (http://www.geocities.jp/flash3kyuu/auf/banding17.zip) to AviSynth. Its algorithm is simple but it is quite effective for some anime sources.
2.0pre2 with native VapourSynth support: http://nmm.me/tr

Some notes:

* This is still an experimental version, it has not been fully 
  tested, so please use it with caution.
* sample_mode=0 and dither_algo=0 are removed in this 
  version since nobody is using them.
* Document has not been updated yet, please refer to test.vpy 
  for sample usage. All parameters are in lower case.
* Because input_mode/input_depth/output_mode can be 
  implied from clip properties, they are not settable in VS 
  interface. output_depth is still available though.

* Fixes compatibility with XP
* Exports public API, can be used as a standalone library
Change log:
1.5.1 (2012-04-07)
* Supports setting StdDev (sigma) for the Gaussian random number generator

1.5.0 (2012-03-12)
* (There isn't any new feature in this version, only some parameters are modified to reduce user confusion)
* ditherY/ditherC are renamed to grainY/grainC
* dynamic_dither_noise is renamed to dynamic_grain
* precision_mode is renamed to dither_algo, mode 4 and 5 are removed
* random_algo_dither is renamed to random_algo_grain
* enable_fast_skip_plane is removed, this optimization will be enabled mplicitly whenever possible (Filter result won't be changed by this optimization)

1.4.2 (2011-11-10)
* Fixed crash on some non-mod16 videos

1.4.1 (2011-11-05)
* Fixed broken YUY2 support (still slow)
* Improved default value handling of bitdepth-related parameters
* precision_mode 4 / 5 are now deprecated and may be removed in future versions, you can use output_mode 1 / 2 to achieve the same result

1.4.0 (2011-10-30)
* 9 ~ 16 bit-depth input/output
** Related parameters: input_mode/input_depth/output_mode/output_depth
* New random number generator, reference position and dither noise can be generated in uniform or gaussian distribution
** Related parameters: random_algo_ref / random_algo_dither
* diff_seed is replaced with dynamic_dither_noise, when enabled, noise pattern will be different for each frame
* Another new parameter: enable_fast_skip_plane
* Short filter alias: f3kdb
* Now the ICC-compiled DLL should be runnable on pre-SSE2 systems (untested)
* Several bug fixes

1.3.0 (2011-09-07)
* Added x64 version
* Added a downsample filter: f3kdb_dither
* Internal precision is increased to 16bit
* New parameter: keep_tv_range, please see readme.txt for details
* Default sample_mode is changed to 2 as it is better in most cases
* Fixed: Floyd-Steinberg dithering may produce incorrect result for full-range videos
* Fixed: Broken YUY2 debanding
* Minor optimizations

1.2.0 (2011-08-01)
* Added support for YUY2 (not optimized yet)
* Added support for all planar YUV format in AviSynth 2.6
* The filter is now compatible with both AviSynth 2.5 and 2.6
* 16bit output (precision_mode = 4/5)
* Note: The internal processing precision is still 14bit, this will be
improved in future versions

1.1.0 (2011-06-18)
* Fixed a bug that high threshold values would produce incorrect result in high precision modes.
* Threshold values was scaled based on other parameter in previous versions, it is unscaled now to increase flexibility. Using same value has weaker effect in new version. Effect of default parameter set is also changed.
* SSE optimization for high precision mode.
* Rejects some invalid parameter combination instead of silently skips them

* High precision mode
(currently non-optimized, SSE routine will be added later)
* Frame edges are properly processed now
* Fix crash in some cases (unaligned frames are handled correctly)
* Other bug fixes

Binary: x86 / x64 / MSVC
(The MSVC build is slower, use that only if the x86 build has problems)

Documentation: https://raw.github.com/SAPikachu/fla...yuu_deband.txt

Source code: https://github.com/SAPikachu/flash3k...and/tree/1.5.1

Samples: #1 #2 #3 #4 (1st in post #4) #5 (2nd in post #4) All

(Note: I used different image source for samples starting from 1.0.2, the original sources are not very banded indeed.)

Script for generating the samples (changed again on 6-19):
ImageReader("wallorig.png", end=0)

global i=0
StackVertical(last.croppic.subtitle("original"), last.croppic.luma_histogram.subtitle("original"))

addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=3)""") #1
addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=3,y=64,cb=64,cr=64,grainy=32,grainc=32)""") #2
addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=3,y=64,cb=64,cr=64,grainy=16,grainc=16)""") #3
addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=3,y=64,cb=64,cr=64,grainy=0,grainc=0)""") #4
addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=2,y=64,cb=64,cr=64,grainy=32,grainc=32)""") #5
addtest(last,pic,"""flash3kyuu_deband(sample_mode=2,dither_algo=1,y=64,cb=64,cr=64,grainy=32,grainc=32)""") #6
addtest(last,pic,"""gradfun3(smode=1,mask=0)""") #7
addtest(last,pic,"""gradfun3(smode=2,mask=0)""") #8


function luma_histogram(clip c)
    return c.histogram("luma").ColorYUV(levels="PC->TV")

function croppic(clip c)
    return c.crop(100,100,400,400)

function addtest(clip c, clip pic, string expr)
    global i=i+1
    expr="#" + string(i) + " " + expr
    StackVertical(last.subtitle(expr), luma_histogram.subtitle(expr))
    return StackHorizontal(c,last)
Comments are appreciated.

Last edited by SAPikachu; 3rd December 2012 at 13:22.
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avisynth, deband

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