@item r
Set research radius duration. Allowed range is from 2 to 300 milliseconds.
Default value is 6 milliseconds.
+
+@item o
+Set the output mode.
+
+It accepts the following values:
+@table @option
+@item i
+Pass input unchanged.
+
+@item o
+Pass noise filtered out.
+
+@item n
+Pass only noise.
+
+Default value is @var{o}.
+@end table
@end table
@section anull
@item reset
Set number of frame after which stats are going to be recalculated.
Default is disabled.
+
+@item measure_perchannel
+Select the entries which need to be measured per channel. The metadata keys can
+be used as flags, default is @option{all} which measures everything.
+@option{none} disables all per channel measurement.
+
+@item measure_overall
+Select the entries which need to be measured overall. The metadata keys can
+be used as flags, default is @option{all} which measures everything.
+@option{none} disables all overall measurement.
+
@end table
A description of each shown parameter follows:
this value will not alter source pixel. Default is 10.
Allowed range is from 0 to 65535.
+@item tolerance
+Set tolerance for difference amplification. Any difference lower to
+this value will not alter source pixel. Default is 0.
+Allowed range is from 0 to 65535.
+
@item low
Set lower limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
This option controls maximum possible value that will decrease source pixel value.