The visual processor supplies the proper input signals to the DRFSM DEDS as the inspection takes place. These signals are dependent upon the state of the scene and are triggered by discrete events that are observed by the camera.
The visual processor layer is made up of several filters that are applied to each image as it is captured. Several pieces of information must be known about the scene before a signal is produced. The location of the part, the location of the probe, the distance between them, the number of features on the part, and the distance to the closest feature.
Once this information is known, we are able to supply the correct signal that will drive the DRFSM DEDS. The machine, will then switch states appropriately and wait for the next valid signal. This process is a recursive one, in that, the machine will be applied recursively to the closed features. As the probe enters a closed region, another machine will be activated, that will inspect the smaller closed region with the same strategy that was used on the enclosing region.