文章基本信息

标题：Application of Time-Delay Estimation to Mixed Reality Multisensor Tracking
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作者：Manuel Huber ; Michael Schlegel ; Gudrun Klinker 等
期刊名称：Journal of Virtual Reality and Broadcasting
印刷版ISSN：1860-2037
出版年度：2014
卷号：11
期号：3
DOI：10.20385/1860-2037/11.2014.3
出版社：University of Applied Sciences Dusseldorf
摘要：Spatial tracking is one of the most challenging and important parts of Mixed Reality environments. Many applications, especially in the domain of Augmented Reality, rely on the fusion of several tracking systems in order to optimize the overall performance. While the topic of spatial tracking sensor fusion has already seen considerable interest, most results only deal with the integration of carefully arranged setups as opposed to dynamic sensor fusion setups. A crucial prerequisite for correct sensor fusion is the temporal alignment of the tracking data from several sensors. Tracking sensors are typically encountered in Mixed Reality applications, are generally not synchronized. We present a general method to calibrate the temporal offset between different sensors by the Time Delay Estimation method which can be used to perform on-line temporal calibration. By applying Time Delay Estimation on the tracking data, we show that the temporal offset between generic Mixed Reality spatial tracking sensors can be calibrated. To show the correctness and the feasibility of this approach, we have examined different variations of our method and evaluated various combinations of tracking sensors. We furthermore integrated this time synchronization method into our UBITRACK Mixed Reality tracking framework to provide facilities for calibration and real-time data alignment.
关键词：calibration;sensor fusion;synchronization;tracking;ubiquitous tracking