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Sensors 2013, 13(4), 4102-4121; doi:10.3390/s130404102

Frame Synchronization of High-Speed Vision Sensors with Respect to Temporally Encoded Illumination in Highly Dynamic Environments

1
Department of Automation, Shanghai Jiao Tong University, and Key Laboratory of System Controland Information Processing, Ministry of Education of China, Shanghai 200240, China
2
Graduate School of Information Sciences, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku,Sendai 980-8579, Japan
*
Author to whom correspondence should be addressed.
Received: 1 March 2013 / Revised: 21 March 2013 / Accepted: 22 March 2013 / Published: 26 March 2013
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Japan 2012)

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. View Full-Text
Keywords: robot vision; vision chip; camera synchronization; visual feedback control; phase-locked loop; signal normalization; quadrature detection; intelligent coding; Manchester encoding robot vision; vision chip; camera synchronization; visual feedback control; phase-locked loop; signal normalization; quadrature detection; intelligent coding; Manchester encoding
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hou, L.; Kagami, S.; Hashimoto, K. Frame Synchronization of High-Speed Vision Sensors with Respect to Temporally Encoded Illumination in Highly Dynamic Environments. Sensors 2013, 13, 4102-4121.

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