An Automated Inspection System

Development of a Quality Inspection System Using Laser Based Scanner

“…The method of (Osada et al, 2002) creates an abstraction of the 3D model as a probability distribution of samples from a shape function acting on the model. The method introduced in (Prieto et al, 2002) conducted visual inspections of common mechanical parts and made comparisons between measurement surfaces and their CAD models. (Novotni & Klein, 2004) demonstrated the use of 3D Zernike descriptors.…”

“…Registration is the process that involves the alignment of two or more point data sets in different coordinate systems to each other, resulting into one coordinate system for both. In the laser scanning systems, the process is achieved by transforming the coordinate system of one of the points sets to the other point set coordinate system by applying specific translations and rotations (Prieto et al, 2002) in means of rigid body transformations(six degrees of freedom), where the shape and size are preserved(Scale factor is unity -orthogonal transformation).…”

Automatic evaluation of form errors in high-density acquired surfaces

“…In this work nominal references are classified into two main categories: explicit and intrinsic. The explicit reference can be given by a specification, also by using a CAD model (Prieto et al 2002, Gao et al 2006. Intrinsic references are nominal entities that can be recognized in the scanned object, independently of the tolerance specification.…”

“…A great number of the methodologies proposed in literature require the knowledge of the CAD model of the workpiece under inspection, which provides the nominal references in the form of the analytical surface describing the geometric model (Prieto et al 2002, Li and Gu 2004, Gao et al 2006. Since tolerance specifications usually refer to some features of the workpiece, the mapping between one surface (or feature) of the CAD model and the corresponding scanned point sub -cloud has to be performed.…”

“…Nowadays no standard language able to specify tolerances and suited to automatic verification has yet been defined. Prieto et al in (Prieto et al 2002) propose and implement a methodology for the automated inspection of manufactured parts. This methodology is able to verify both dimensional and geometric tolerances.…”