Next Article in Journal
Design and Analysis of MEMS Based PVDF Ultrasonic Transducers for Vascular Imaging
Previous Article in Journal
Assessment of Human Ambulatory Speed by Measuring Near-Body Air Flow
Sensors 2010, 10(9), 8719-8739; doi:10.3390/s100908719
Article

A Signal Normalization Technique for Illumination-Based Synchronization of 1,000-fps Real-Time Vision Sensors in Dynamic Scenes

* ,
 and
Received: 9 August 2010 / Revised: 9 September 2010 / Accepted: 10 September 2010 / Published: 20 September 2010
(This article belongs to the Section Physical Sensors)

Abstract

To acquire images of dynamic scenes from multiple points of view simultaneously, the acquisition time of vision sensors should be synchronized. In this paper, an illumination-based synchronization derived from the phase-locked loop (PLL) mechanism based on the signal normalization method is proposed and evaluated. To eliminate the system dependency due to the amplitude fluctuation of the reference illumination, which may be caused by the moving objects or relative positional distance change between the light source and the observed objects, the fluctuant amplitude of the reference signal is normalized framely by the estimated maximum amplitude between the reference signal and its quadrature counterpart to generate a stable synchronization in highly dynamic scenes. Both simulated results and real world experimental results demonstrated successful synchronization result that 1,000-Hz frame rate vision sensors can be successfully synchronized to a LED illumination or its reflected light with satisfactory stability and only 28-μs jitters.
Keywords: high-speed vision; robot vision; vision chip; camera synchronization; phase-locked loop; signal processing; visible light communication; signal normalization; quadrature detection high-speed vision; robot vision; vision chip; camera synchronization; phase-locked loop; signal processing; visible light communication; signal normalization; quadrature detection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

Hou, L.; Kagami, S.; Hashimoto, K. A Signal Normalization Technique for Illumination-Based Synchronization of 1,000-fps Real-Time Vision Sensors in Dynamic Scenes. Sensors 2010, 10, 8719-8739.

View more citation formats

Related Articles

Article Metrics

Comments

Citing Articles

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert