A signal normalization technique for illumination-based synchronization of 1,000-fps real-time vision sensors in dynamic scenes

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3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)8719-8739
Number of pages21
JournalSensors
Volume10
Issue number9
DOIs
Publication statusPublished - 2010 Sep

Keywords

  • Camera synchronization
  • High-speed vision
  • Phase-locked loop
  • Quadrature detection
  • Robot vision
  • Signal normalization
  • Signal processing
  • Visible light communication
  • Vision chip

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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