Filter Plugins/Filter Dnr

Capabilities

Introduction

The filter analyses every pixel of a frame broken down by Luma- and Chroma-parts (YUV-Mode), respectively Red, Green, Blue (RGB-Mode), so that brightness- as well as color-noise can be treated separately.

The levels of Luma-Pixellock and Chroma-Pixellock specify to which difference of a pixel between to frames a displacement through the last pixel should take place, that is wether the pixel value should be locked. Luma-Pixellock is applied to the luma-part (Red) and Chroma-Pixellock is applied to chroma-part (Green/Blue). But a pixel is refreshed at the latest of 30 locks.

As a basic principle the threshold values should be greater lock values to give a balanced ratio between locking and crossfade. The levels are compared to the differences (biased) of pixels, that is greater levels amplify the filter effect due to the fact that greater differences are filtered.

The default values of the parameters should give a usable result. The filter has then, despite the nois-reduction, a soft-focus effect. With noisy material, this filter can reduce the needed bitrate up to 25% (highly depends on the material).

Parameters

 -J "dnr=<lt>:<ll>:<ct>:<cl>:<sc>"

Default values are shown in [green] in square brackets.

<lt> Luma-Threshold (1-128) [10]

<ll> Luma-Pixellock (1-128) [4]

<ct> Chroma-Threshold (1-128) [16]

<cl> Chroma-Pixellock (1-128) [8]

<sc> Scene-Change-Detection (1-90) [30]

Values outside the allowed ranges and omitted values fallback to the default.

Usage Examples

• Luma-Threshold value to 20 (remainder fallbacks to default)

 -J dnr=20

• Scene-Change-Detection to 60 (remainder fallbacks to default)

 -J dnr=::::60

• Luma-Threshold to 20 and Chroma-Threshold to 32 (remainder fallbacks to default)

 -J dnr=20::32