Arc Finder ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 389 Object Definition Polarity Mode Selects the type of polarity accepted for finding an entity. Polarity identifies the change in grey-level values from the tool center (inside) towards the outside. Search Mode Specifies the method used to select a hypothesis. Show Results Graphics Specifies if the graphics are drawn in the Vision Window. Tool Links Image Source Defines the image source used for processing by this vision tool. Region of Interest (ROI) Guideline Offset Defines the offset, from the center of the region of interest, for the guideline. Relative To Specifies the tool that will provide the input to this tool.
The tool can be dragged from the Folder pane and dropped into this field. Search Region Defines the Center, Radius, Rotation, Thickness, and Opening of the ROI. The Thickness cannot be set to more than twice the radius, or the inner diameter would become negative. The tool prevents you from doing this. Advanced Properties Arc Must Be Totally Enclosed When true, the start and end points of the arc must be located on the radial bounding sides of the region of interest. When false, the found arc can enter and/or exit the region of interest at the inner or outer annular bounds of the region of interest.
Conformity Tolerance Maximum local deviation between the expected model contours of an instance and the contours actually detected in the input image. Contrast Threshold Defines the minimum contrast needed for an edge to be detected in the input image and used for arc computation.