A Marker Calibration Method Utilizing A Priori Knowledge on Marker Arrangement
ISMAR '04 Proceedings of the 3rd IEEE/ACM International Symposium on Mixed and Augmented Reality
Outdoor See-Through Vision Utilizing Surveillance Cameras
ISMAR '04 Proceedings of the 3rd IEEE/ACM International Symposium on Mixed and Augmented Reality
Automatic Reconstruction of Wide-Area Fiducial Marker Models
ISMAR '07 Proceedings of the 2007 6th IEEE and ACM International Symposium on Mixed and Augmented Reality
An initialization tool for installing visual markers in wearable augmented reality
ICAT'06 Proceedings of the 16th international conference on Advances in Artificial Reality and Tele-Existence
ICAT'06 Proceedings of the 16th international conference on Advances in Artificial Reality and Tele-Existence
Authoring of mixed reality applications including multi-marker calibration for mobile devices
EGVE'04 Proceedings of the Tenth Eurographics conference on Virtual Environments
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Industrial Augmented Reality (AR) applications require fast, robust, and precise tracking. In environments where conventional high-end tracking systems cannot be applied for certain reasons, marker-based tracking can be used with success as a substitute if care is taken about (1) calibration and (2) run-time tracking fidelity. In out-of-the-laboratory environments multi-marker tracking is needed because the pose estimated from a single marker is not stable enough. The overall pose estimation can be dramatically improved by fusing information from several markers fixed relative to each other compared to a single marker only. To achieveresults applicable in an industrial context relative marker poses need to be properly calibrated. We propose a semi-automatic image-based calibration method requiring only minimal interaction within the workflow. Our method can be used off-line, or preferably incrementally online. When used online, our method shows reasonably good accuracy and convergence with workflow interruption of less than one second per incremental step. Thus, it can be interactively used. We illustrate our method with an industrial application scenario.