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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.


Jitters of different modulated ratio in total illumination of Manchester Encoding synchronization.
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f18-sensors-13-04102: Jitters of different modulated ratio in total illumination of Manchester Encoding synchronization.

Mentions: The LED intensity is measured by a luminometer, with the minimum jitter being 24 μs. In the first test, when the modulated illumination is 9 lx within the total 411 lx illumination, 2.2%, synchronization is lost. Jitter is 24 μs at minimum and can increase up to 52 μs. In the second test, when the modulated illumination is 18 lx within the total 174 lx illumination, 10.3%, the synchronization is lost. Jitter is 24 μs at minimum and can increase up to 52 μs. The minimum jitters are the same according to different background lights in Figure 18.


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)

Jitters of different modulated ratio in total illumination of Manchester Encoding synchronization.
© Copyright Policy
Related In: Results  -  Collection

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

f18-sensors-13-04102: Jitters of different modulated ratio in total illumination of Manchester Encoding synchronization.
Mentions: The LED intensity is measured by a luminometer, with the minimum jitter being 24 μs. In the first test, when the modulated illumination is 9 lx within the total 411 lx illumination, 2.2%, synchronization is lost. Jitter is 24 μs at minimum and can increase up to 52 μs. In the second test, when the modulated illumination is 18 lx within the total 174 lx illumination, 10.3%, the synchronization is lost. Jitter is 24 μs at minimum and can increase up to 52 μs. The minimum jitters are the same according to different background lights in Figure 18.

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.