Omron V430-F-series User Manual page 303

Morphological Operation and Operator Size
Open (Connect Dark)
Open removes minor light defects of dark cells by performing a Dilate function followed by
an Erode function.
Close (Separate Dark)
Close removed minor dark defects of light cells by performing an Erode function followed
by a Dilate function.
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Auto Focus Multi Code Reader V430-series User's Manual (Z392)