A ball-based intermediary target technique is presented to position moving machine vision measurement system and to realize data registration under different positions. Large-sized work-piece measurement based on machine vision faces several problems: limited viewing angle, range and accuracy of measurement inversely proportional. To measure the whole work-piece conveniently and precisely, the idea that using balls as registration target is proposed in this paper. Only a single image of the ball target is required from each camera then the vision system is fully calibrated (intrinsic and extrinsic camera parameters). When the vision system has to be moved to measure the whole work-piece, one snapshot of the ball target in the common view can position the system. Then data registration can be fulfilled. To achieve more accurate position of ball’s center, an error correction model is established.

Date Published: 24 May 2013
PDF: 9 pages
Proc. SPIE 8791, Videometrics, Range Imaging, and Applications XII; and Automated Visual Inspection, 87911Q (24 May 2013); doi: 10.1117/12.2020431

Published in SPIE Proceedings Vol. 8791:
Videometrics, Range Imaging, and Applications XII; and Automated Visual Inspection
Fabio Remondino; Jürgen Beyerer; Fernando Puente León; Mark R. Shortis, Editor(s)