Locator The scale of objects to be located can be set at a fixed nominal value, or as a range of scale val- ues. The default setting for the scale factor is a nominal value of 1, which applies to most situ- ations. If objects have a slight variation in scale, the objects may be recognized and positioned with reduced quality because their true scale factor will not be measured. In such a case, it is preferable to configure a narrow scale range, instead of a nominal value. NOTE : Using a large scale factor can significantly slow down the search process. This range should be configured to include only the scale factors that are actually expected for a given application.
The scale factor range is one of the parameters that has the most sig- nificant impact on search speed. Use Nominal Search for a specific scale factor. Note that when a nominal value is used, the Locator does not compute the actual scale of instances; instead, the instances are positioned using the Nominal scale value. When Nominal is checked, the Nominal scale factor is applied. Disable the Use Nominal checkbox to specify the range of scale the Locator will search for. If you want to search for an instance at a nominal scale factor, but need to compute its actual scale, disable the Nominal checkbox and enter a small range, such as 0.99 to 1.01. Nominal A value, from 0.1 to 10.
A Nominal scale factor of 1 is set by default. Maximum The maximum scale factor that the Locator will look for. This must be less than or equal to 10, and greater than or equal to Minimum. Minimum The minimum scale factor that the Locator will look for. This must be greater than or equal to 0.1, and less than or equal to Maximum. Positioning Level Allows you to modify the positioning accuracy. The default setting of 5 is the optimized and recommended setting for typical applications. Positioning Level can be from 0 to 10. A value of 0 will provide coarser positioning and faster execution time. Conversely, a value of 10 will provide high-accuracy positioning of object instances.
ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 570