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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.


Waveform Creation Software for Tektronix Signal Generators.
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f11-sensors-13-04102: Waveform Creation Software for Tektronix Signal Generators.

Mentions: A temporally modulated Manchester Encoding sequence carries sequential information in every index segment. Due to the irregular waveforms of the reference signal, this time we modulate the LED reference illumination in advance and store the waveform coding within Tectronics AFG3102 with the help of MATLAB. Specific wave data according to different indexes and monitoring lengths can be generated in the format of CSV files by MATLAB beforehand and is then converted to TFW files for the arbitrary waveform generator. The snapshot of a sequence of self-repeating two reference periods (1,0,0,0,0,0,1,0) generated by wave generator is shown in Figure 11.


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)

Waveform Creation Software for Tektronix Signal Generators.
© Copyright Policy
Related In: Results  -  Collection

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

f11-sensors-13-04102: Waveform Creation Software for Tektronix Signal Generators.
Mentions: A temporally modulated Manchester Encoding sequence carries sequential information in every index segment. Due to the irregular waveforms of the reference signal, this time we modulate the LED reference illumination in advance and store the waveform coding within Tectronics AFG3102 with the help of MATLAB. Specific wave data according to different indexes and monitoring lengths can be generated in the format of CSV files by MATLAB beforehand and is then converted to TFW files for the arbitrary waveform generator. The snapshot of a sequence of self-repeating two reference periods (1,0,0,0,0,0,1,0) generated by wave generator is shown in Figure 11.

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.