Arc Edge Locator Edge Constraint Editor Window Edge Score The tool scores potential edges according to the specified edge parameters. The scoring method restricts the search so that only results for valid edge pairs are returned. There are two types of parameters that affect the choice of valid edges: Polarity and Edge Score Constraints. 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. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 378