Omron V430-F-series User Manual page 304

Operator Size
Definition: Operator Size determines the size of the area or "pixel neighborhood"
(measured in pixels) in which the morphological operation is being performed.
Serial Cmd: <K551,0,morphological operation,operator size>
Default: Small
Options: 3 = Small (3 pixels by 3 pixels)
5 = Medium (5 pixels by 5 pixels)
7 = Large (7 pixels by 7 pixels)
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