Quality Evaluation in a 3D Inspection System

Three-dimensional quality control is a common task in industry. These systems are mainly based on 2D technology where overhead/lateral views are the only ones that are inspected. However, these systems cannot deal with complex objects. In this field it is necessary to inspect every part of the object. This is only possible if we have a full 3D representation of the object. In order to get a 3D representation of an object, our system makes use of an octree carving procedure. This technique presents some limitations on certain regions depending on the topology of the object. Thus, it is useful to estimate the implicit error in the entire object as well as to know which areas are good candidates for a precise quality control. Three dimensional global and local metrics are presented for mesh volume and mesh surface as well as for octree volume. An intensity texture that informs about the error is also applied to the reconstructed object. A set of synthetic objects have been created and a virtual reconstruction have been carried out in wide range of positions so as to simulate conditions in a free-falling real system. Finally, a complete set of experiments report the differences between ideal and reconstructed objects.