This is an adaptive local noise reduction filter. It uses global variance of the noise, local mean and local variance in a moving grid of specified size. It tries to preserve edges as closely as possible.
works in YUY2, Planar and, RGB color spaces and for all bit depths supported by avisynth+. This is thread safe : MT_NICE_FILTER.
The window for computing global variance be located in an area with least image grey level (luma) variations, and as large as possible (10,000+ pixels) so that noise statistics are correctly estimated. Note that window coordinates must be specified
The process tries to retain the sharpness of the image, though some blurring may be unavoidable. The process may be repeated number of times to get desired result. However results depend on window selected.
| Description | Name | Type | Limits | Default |
| Input clip | clip | none | ||
| frame number in which specified window is located | sf | integer | within clip | 0 |
| Number of pixels along x axis in moving grid | xgrid | integer | 3 to 9 | 5 |
| Number of pixels along y axis in moving grid | ygrid | integer | 3 to 9 | xgrid |
| window left x computing global variance | lx | integer | within clip, less than rx | none. Must be specified |
| window top y for computing global variance | ty | integer | within clip, less than by | none. Must be specified |
| window width for computing global variance | wd | integer | lx + wd be within frame | none. Must be specified |
| window height for computing global variance | ht | integer | ty + ht be within frame | none. Must be specified |
| Whether U and V of YUY2 and YUV formats to be processed | uv | boolean | true for uv process, false for not process | true |
| Whether A value of RGB formats to be processed | a | boolean | true yes, false no | false |
| Whether variance values are to be displayed as an error message | show | boolean | true yes, false no | false |
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