Event-Based high-speed low-latency fiducial marker tracking
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Motion and dynamic environments, especially under challenging lighting conditions, are still an open issue for robust robotic applications. In this paper, we propose an end-to-end pipeline for real-time, low latency, 6 degrees-of-freedom pose estimation of fiducial markers. Instead of achieving a pose estimation through a conventional frame-based approach, we employ the high-speed abilities of event-based sensors to directly refine the spatial transformation, using consecutive events. Furthermore, we introduce a novel two-way verification process for detecting tracking errors by backtracking the estimated pose, allowing us to evaluate the quality of our tracking. This approach allows us to achieve pose estimation at a rate up to 156 kHz, while only relying on CPU resources. The average end-to-end latency of our method is 3 ms. Experimental results demonstrate outstanding potential for robotic tasks, such as visual servoing in fast action-perception loops.
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