Dual-projector structured light 3D shape measurement

Ying Yu, Daniel L. Lau, Matthew P. Ruffner, Kai Liu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Structured light illumination is an active three-dimensional scanning technique that uses a projector and camera pair to project and capture a series of stripe patterns; however, with a single camera and single projector, structured light scanning has issues associated with scan occlusions, multi-path, and weak signal reflections. To address these issues, this paper proposes dual-projector scanning using a range of projector/camera arrangements. Unlike previous attempts at dual-projector scanning, the proposed scanner drives both light engines simultaneously, using temporal-frequency multiplexing to computationally decouple the projected patterns. Besides presenting the details of how such a system is built, we also present experimental results demonstrating how multiple projectors can be used to (1) minimize occlusions; (2) achieve higher signal-to-noise ratios having twice a single projector’s brightness; (3) reduce the number of component video frames required for a scan; and (4) detect multi-path interference.

Original languageEnglish
Pages (from-to)964-974
Number of pages11
JournalApplied Optics
Issue number4
StatePublished - Feb 1 2020

Bibliographical note

Publisher Copyright:
© 2020 Optical Society of America.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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