Geometrical inspection of designed and acquired surfaces

In this study a series of procedures were implemented to compare acquired surfaces with the nominal data or to directly compare different scanned surfaces. In particular a morphological evaluation algorithm based on the extended Gaussian curvature (EGC) and a method to compare features based on aggregate normal orientation are presented. To perform the comparison between the features a simple procedure for segmentation was developed. The main characteristic of the two methods is a robust behavior referring to the scan orientation. The procedures were implemented as software modules in a graphic environment.