Median--AE

This effect replaces each pixel with the median pixel value of neighboring pixels within a given radius. At low values, this effect is useful for reducing noise. At higher values, this effect gives a clip a painterly effect.

Radius Specifies how many pixels to examine for the Median effect. For instance, when Radius is set to 1, the Median will be performed on the eight neighboring pixels that are within one pixel of the center pixel.

Operate on Alpha Channel Applies the effect to the alpha channel.

Applying Effects > Video effects included with Premiere > Median--AE