Fast laser stripe extraction for 3D metallic objects
Résumé
Dimensional control of metallic objects is challenging since their surfaces present strong specular properties. The 3D measurement systems based on laser-camera triangulation project the laser on to the surface of the object and do not always provide satisfying results for metallic object. In this paper, we analyze images of metallic objects that are corrupted by speckle noise as a result of their surface aspect problems. The performance reached by those systems depends on the accuracy of extraction of the coordinates of pixels that correspond to the center of the laser line projected on the object. We have developed a column-wise laser stripe extraction method that can be used for industrial application in real-time. To qualify this system, we have made various experiments on synthetic images of these objects, and compare the accuracy of the proposed stripe extraction methods.