Evaluation of Calibration for Optical See-Through Augmented Reality Systems

A crucial aspect in the implementation of an augmented reality (AR) system is determining its accuracy. The accuracy of a system determinies the applications it can be used for. The aim of our research is measuring the overall accuracy of an arbitrary AR system. Once measurements of a system are made, they can be analyzed for structure and used to track down sources of error. From the analysis it may also be possible to improve the methods used to calibrate and register the virtual to the real. This paper describes an online method for measuring the registration accuracy of optical see-through AR systems. By online, we mean that the user can measure the registration error they are experiencing while they are using the system. We overcome the difficulty of not having retinal access by having the user indicate the projection of a perceived object on a planar measurement device. Our method provides information which can be used to analyze the structure of the system error in two or three dimensions. The results of the application of our method to two monocular optical see-through AR systems are shown.

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