Real-time, composite pattern, demodulation using optical correlators

Daniel L. Lau, Laurence G. Hassebrook, Thomas Lu, Tien Hsin Chao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Structured light illumination refers to a technique of acquiring 3-D surface scans through triangulation between a camera and a projector. Because traditional structured-light systems use multiple patterns projected sequentially in time, SLI is not typically associated with applications involving moving surfaces. To address this problem, the authors have introduced a technique referred to as composite pattern projection which involves the combining of a set of standard SLI patterns into a continuously projected pattern such that depth can be recovered from a single, captured image. As such, composite patterns can be used for tracking moving objects in 3-D space. The problem with composite patterns, though, is the added computational complexity associated with demodulating the captured image and extract the component SLI patterns. So in this paper, we introduce a means of achieving real-time pattern demodulation through the use of optical correlators with demonstrated results achieving a processing rate of over 100 frames per second.

Original languageEnglish
Title of host publicationSpaceborne Sensors III
StatePublished - 2006
EventSpaceborne Sensors III - Kissimmee, FL, United States
Duration: Apr 18 2006Apr 18 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceSpaceborne Sensors III
Country/TerritoryUnited States
CityKissimmee, FL


  • Multi-spectral color
  • Recording
  • Video

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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