Adept AdeptSight User Guide - Manual (Page 266)

Configuring Arc Edge Locator Properties
Polarity
Polarity corresponds to the change in light values, moving from left to right in
the display, along the X-Axis in the region of interest. The tool applies the Polar-
ity constraint before applying edge-score Constraints.
Polarity does not affect the Edge Score, but only edges that meet the selected
Polarity are output as valid edges, regardless of their scores.
l
Dark to Light will only accept edges occurring at transitions from a dark
area to a light area.
l
Light to Dark will only accept edges occurring at transitions from a light
area to a dark area.
l
Either will accept any edge, regardless of polarity.
Edge Polarity
Edge Score Constraints
There are two types of constraints: Position and Magnitude. You can set the
tool to use only one constraint or both. A graphical function editor is provided
for viewing and setting each type of constraint.
l If only one constraint is selected, edges are scored based on the selected
constraint.
l If both constraints are selected, each constraint accounts for 50% of the
edge score.
Magnitude Constraint
The Magnitude constraint is based on edge values relative to the Magnitude
Threshold. Edges having a magnitude equal to or exceeding the Magnitude
Threshold are given a score of 1. Edges with values below the Magnitude
Threshold receive a score ranging from 0 to 0.999, according to a manually set
AdeptSight User's Guide, Version 3.2.x, Updated: 8/23/2012
Page 266