Denoise frames using Block-Matching 3D algorithm.

The filter accepts the following options.

sigma

Set denoising strength. Default value is 1. Allowed range is from 0 to 999.9. The denoising algorith is very sensitive to sigma, so adjust it according to the source.

block

Set local patch size. This sets dimensions in 2D.

bstep

Set sliding step for processing blocks. Default value is 4. Allowed range is from 1 to 64. Smaller values allows processing more reference blocks and is slower.

group

Set maximal number of similar blocks for 3rd dimension. Default value is 1. When set to 1, no block matching is done. Larger values allows more blocks in single group. Allowed range is from 1 to 256.

range

Set radius for search block matching. Default is 9. Allowed range is from 1 to INT32_MAX.

mstep

Set step between two search locations for block matching. Default is 1. Allowed range is from 1 to 64. Smaller is slower.

thmse

Set threshold of mean square error for block matching. Valid range is 0 to INT32_MAX.

hdthr

Set thresholding parameter for hard thresholding in 3D transformed domain. Larger values results in stronger hard-thresholding filtering in frequency domain.

estim

Set filtering estimation mode. Can be basic or final. Default is basic.

ref

If enabled, filter will use 2nd stream for block matching. Default is disabled for basic value of estim option, and always enabled if value of estim is final.

planes

Set planes to filter. Default is all available except alpha.