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Frame synchronization of high-speed vision sensors with respect to temporally encoded illumination in highly dynamic environments.

Hou L, Kagami S, Hashimoto K - Sensors (Basel) (2013)

Bottom Line: 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.This result is believed to be applicable to low-cost wireless vision sensor network.

View Article: PubMed Central - PubMed

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

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.

No MeSH data available.


Conceptual diagram of the illumination-based camera synchronization system.
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f1-sensors-13-04102: Conceptual diagram of the illumination-based camera synchronization system.

Mentions: Figure 1 illustrates the conceptual diagram of the proposed synchronized camera system. Incident light to cameras serves as the reference signal. Internal functions of cameras, such as the analog photo integration process in the imager and the digital computation executed outside the imager, constitute a PLL to synchronize the output signal, which is the vision frame timing. In this way the camera frame timing is locked to the reference illumination.


Frame synchronization of high-speed vision sensors with respect to temporally encoded illumination in highly dynamic environments.

Hou L, Kagami S, Hashimoto K - Sensors (Basel) (2013)

Conceptual diagram of the illumination-based camera synchronization system.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673073&req=5

f1-sensors-13-04102: Conceptual diagram of the illumination-based camera synchronization system.
Mentions: Figure 1 illustrates the conceptual diagram of the proposed synchronized camera system. Incident light to cameras serves as the reference signal. Internal functions of cameras, such as the analog photo integration process in the imager and the digital computation executed outside the imager, constitute a PLL to synchronize the output signal, which is the vision frame timing. In this way the camera frame timing is locked to the reference illumination.

Bottom Line: 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.This result is believed to be applicable to low-cost wireless vision sensor network.

View Article: PubMed Central - PubMed

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

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.

No MeSH data available.