1. A graphical user interface (GUI) displayed on a computer display for setup and testing of machine vision systems comprising: an interface screen that includes buttons that allow a user to set up and configure a sensor in a region of interest on an image of an object, the sensor providing a high or low value based upon the presence or absence of predetermined features in the region of interest, the region of interest corresponding to a feature of the object; a ladder logic screen on which the user can configure rungs of ladder logic that uses results provided by the sensors as contacts on the rungs to provide discrete high or low output coils for each of the rungs; and an image window that presents a thumbnail of a subject image of the object including graphical representations of sensors associated with selected of the contacts, wherein highlighting each of the contacts causes the window to display the associated graphical representation of the sensor associated with the contact.