title: Frame synchronization of high-speed vision sensors with respect to temporally encoded illumination in highly dynamic environments.
abstract: The authors propose a Manchester Encoding inspired illumination modulation strategy to properly index the temporally-aligned vision frames, which are successfully synchronized by the LED reference signal. Based on signal normalization, Manchester Encoded reference signals carry temporal information owing to serial communication and thus can timestamp the output vision frame. Both simulated and experimental results show satisfactory robustness to various disturbances, such as dynamic targets, fluctuant optical intensity, and unfixed cameras, etc. The 1,000 Hz vision sensor is locked to 500 Hz temporally modulated LED illumination with only 24 μs jitters. This result is believed to be applicable to low-cost wireless vision sensor network.
authors.affiliation: Department of Automation, Shanghai Jiao Tong University, and Key Laboratory of System Controland Information Processing, Ministry of Education of China, Shanghai 200240, China. lei@ic.is.tohoku.ac.jp
authors.forename: Lei
authors.initials: L
authors.lastname: Hou
authors.forename: Shingo
authors.initials: S
authors.lastname: Kagami
authors.forename: Koichi
authors.initials: K
authors.lastname: Hashimoto
references.citation: Opt Lett. 1986 Mar 1;11(3):123
references.pmid: 19730553
references.citation: Sensors (Basel). 2010;10(9):8719-39
references.pmid: 22163682
references.citation: Sensors (Basel). 2010;10(6):5530-47
references.pmid: 22219674