Blob Analyzer Inertia X and Y axes require that the Extrinsic Inertia Results box be checked in the Data Col- lection property. Rotation of the Principal Axes The counterclockwise angle between the X-axis of a selected coordinate system and the major axis. Intrinsic Bounding Box Results The smallest rectangle enclosing the blob. The width and length of this box define the minor axis and the major axis. Extents measure the distance between a blob's center of mass and the four sides of the bounding box. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 422 Object Definition Inertia X-Axis The moment of inertia about the X-axis of the Tool coordinate system.
Inertia Y-Axis The moment of inertia about the Y-axis of the Tool coordinate system. The intrinsic moments of inertia measure the iner- tial resistance of the blob to rotation about its prin- cipal axes. Because their orientation depends on the coordinate system in which the blob is rep- resented, the principal axes, major and minor, are defined in the section on extrinsic blob properties. Object Definition Principal Axes Rotation The angle of axis of the smallest moment of iner- tia with respect to the X-axis of the selected coordinate system.