20 Sep 2013
trevista is a patented machine vision tool for the automated inspection of technical and decorative surfaces. It has been developed for the reliable inspection of a range of surfaces from glossy components to diffusely scattering surfaces. trevista is available from STEMMER IMAGING as a complete system with lens, camera, software and PC.
trevista Cylinder, developed for the inspection of cylindrical surfaces, is based on a patented "shape from shading" technology, just like trevista Surface, which has been developed for the inspection of flat and static surfaces. Information on the three-dimensional shape of an object can hereby be deduced from the shading of its surfaces.
The cylindrical objects inspected by trevista Cylinder are rotated along their longitudinal axis under the dome-shaped diffuser. During the rotation the line scan camera surveys the object with a scanning speed up to 4x. The profile data obtained are planar images of the uncoiled material surface. These synthetic images contain topographic information and allow inspection for characteristics such as scratches, dents, discoloration and stress marks according to their inclination, curvature and texture.
Topographical defects which are relevant for the function of a part can be
distinguished from irrelevant stains caused by lubricants for example. A
structured diffuse illumination of the part and a special calculation
algorithm guarantee high-quality images for the subsequent automatic
evaluation. The three-dimensional surface shape is displayed using topographic
images which make defects of just a few micrometers depth visible. These
defects can be located quickly, reliably and free of interference.
Thanks to the integration of software packages from Teledyne DALSA’s Sherlock and the in-house software library Common Vision Blox, STEMMER IMAGING offers trevista users a powerful and easy-to-handle complete solution.
The main benefits for trevista users lie in the early detection of manufacturing defects in the value chain and thus in the reduction of costs for quality assurance, as well as in the high precision and easy integration in production processes. The variety of surfaces and materials that can be tested with trevista is another great advantage of this vision system, which is also used for the inspection of rotated, milled, polished and galvanised components, even made from black plastic. trevista is ideally suited for glossy surfaces where conventional vision systems have reached their physical limits.
STEMMER IMAGING has been one of the leaders in the machine vision market since 1987. It is one of Europe's largest technology providers in this field. In 1997 STEMMER IMAGING presented Common Vision Blox (CVB), a powerful programming library for fast and reliable development and implementation of vision solutions, which has been deployed successfully throughout the world in more than 40,000 imaging applications in various industries.