As bikes should get a higher priority and also require longer green time to safely cross the signalized intersection, traffic managers are looking for alternative detection systems that can make the distinction between bicycles and other vehicles near the stop bar. In this paper, the drawbacks of a video-based approach are presented, next to the benefits of a thermal-video-based approach for vehicle presence detection with separation of bicycles. Also, the specific technical challenges are highlighted in developing a system that combines thermal image capturing, image processing and output triggering to the traffic light controller in near real-time and in a single housing.
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Robin Collaert, Kristof Maddelein, "Real-time bicycle detection at signalized intersections using thermal imaging technology," Proc. SPIE 8656, Real-Time Image and Video Processing 2013, 865604 (19 February 2013);