Robust and Accurate 3D Measurement of Formed Tube Using Trinocular Stereo Vision

Abstract

We describe a system for inspection of formed tube using stereo vision. Model-based methods are used for robust and accurate location of tube edges. Tube centrelines are matched for stereo reconstruction by trinocular correspondence, and the complete 3D configuration of the tube confirmed by route following. Precision and repeatability values of the order of 0.1mm are obtained. There is no requirement for a prior CAD description of the tube, so that the system can be used both for process control and reverse engineering.