Arc Finder Related Topics Arc Edge Locator Configuring Arc Edge Locator Properties Configuring Arc Edge Locator Properties - Advanced Arc Finder The Arc Finder tool identifies circular features on objects and returns the coordinates of the center of the arc, the angle between the two ends, and the radius. To create an Arc Finder tool, right-click in the Tree structure, then select: New > Vision > Tool > Arc Finder ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 387 Object Definition Projection Magnitude The Edge Locator processes data within the region of interest along pixel-wide lines, called projection paths, parallel to the Rectangle's Y-axis.
The aver- age grey-level value for each projection path is stored in a one-dimensional signal that can be used in the edge location process. The Projection Magnitude can range between - 255 and 255. Positive and negative peaks in the value indicate potential edges. Sharp peaks indic- ate strong, well-defined edges whereas dull peaks may indicate noise or poorly-defined edges. Projection Average The average grey-level value for all projection paths within the physical area bounded by the region of interest. This minimizes variations in pixel values caused by non-edge features or noise.