MosquitoNR

Latest revision as of 15:08, 23 March 2022

[edit] Description

MosquitoNR is a noise reduction filter designed for mosquito noise, which is often caused by lossy compression such as MPEG.
This filter works as follows:

1. Compute low frequency components of the image.

2. Apply direction-aware blur (smoothing). This blur effectively reduces compression artifacts, but also breaks detail.

3. Restore the low frequency components to the blurred image.

MosquitoNR processes luma only, to correctly process chroma take a look at the example below.

[edit] Requirements

• [x86] AviSynth+ or AviSynth 2.6.0
• [x64] AviSynth+
• Progressive input only
• Supported color formats: YUY2, YV12, YV16, YV24, YV411, Y8

• CPU with SSE2 support

[edit] Syntax and Parameters

MosquitoNR (clip, int "strength", int "restore", int "radius", int "threads")

clip   =

Input clip

int  strength = 16

Range: 0 - 32

Sets the strength of the blur.

Setting this value higher brings stronger noise reduction effect, but side effect will also become stronger.

int  restore = 128

Range: 0 - 128

Sets the rate of restoring.

If set to 0, no restoring is performed.

If set to 128, low frequency components of the blurred image is completely replaced with those of the original image, and runs slightly faster.

int  radius = 2

Range: 1 - 2

Sets the radius of the blur.

1 is faster, but will have insufficient effect in some cases.

int  threads = 0

Range: 0 - 32

Controls how many threads are used.

By default, threads is set equal to automatically detected number of processors.

Since this filter needs a lot of memory access, thread efficiency is not very good. Setting this value lower might improve overall processing speed.

[edit] Examples

MosquitoNR with default settings:

AviSource("Blah.avi")
MosquitoNR(strength=16, restore=128, radius=2, threads=0)

MosquitoNR processes only luma. If you want to process chroma too, you can write a script like the following, but there might be no noticeable change.

AviSource("Blah.avi")
MosquitoNR()
u = UtoY8().MosquitoNR() 
v = VtoY8().MosquitoNR()
YtoUV(u, v, last)

[edit] Changelog

Version      Date            Changes

v0.20        2022/03/23      - Moved to GitHub: https://github.com/pinterf/MosquitoNR
                             - No longer a cpp 2.5 plugin: update to AviSynth v2.6 interface
                             - Preserve frame properties when AviSynth+
                             - All inline assembly code is converted to SIMD intrinsics: 64 bit build possible
                             - YUY2 support kept but handled as YV16 internally
                             - Requires SSSE3 instead of SSE2
                             - Add DLL version resource

v0.10        2013/11/29      - x64 version
                             - Compiled with Intel C++ Compiler XE 14.

v0.10        2013/03/14      - Fixed a crash with AviSynth MT
                             - Added support for YV16, YV24, Y411, Y8
                             - Some speed optimizations
                             - Added English documentation

v120210      2012/02/10      - Initial release

[edit] Archived Downloads

• v0.10 x64 version compiled with Intel C++ Compiler XE 14.

[edit] Extenal Links

[edit] Acknowledgments

This filter is a combination of flash3kyuu's AviUtl plugin "smoothing filter" and nilpo's AviUtl plugin waveletAF - "low frequency components protection filter".
This combination was proposed by POP@4bit. I thank all of them very much.

• flash3kyuu's web page (Japanese): http://www.geocities.jp/flash3kyuu/
• nilpo's web page (Japanese): http://nilposoft.info/aviutl-plugin/
• POP@4bit's web page (Japanese): http://pop.4-bit.jp/?p=3362

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