No fixturing of the part is required. Visual tracking is used to guide the probe to the piston edge. We fuse information generated by the vision system with data generated by the machine scales and the probe. The fused information is used to guide the movement of the touch probe as it performs a raster scan inspection across the surface of a piston part. The probe data provide displacement from the part surface, and, in conjunction with the machine scales, the probe position.
Visual tracking is terminated after n scans of the surface are complete.
Path of raster scan. Extraction of pixels representing edge or perimeter points. Fitting edge pixels to lines or curves. Defining the initial probe position in image coordinates via a human-machine interface. Tracking the probe as it moves along the part's surface.