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Multispectral time-of-flight imaging using light-emitting diodes

Research output: Contribution to journalArticle

  • Alexander D. Griffiths
  • Haochang Chen
  • David Day-Uei Li
  • Robert Henderson
  • Johannes Herrnsdorf
  • Martin D. Dawson
  • Michael Strain

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Original languageEnglish
Pages (from-to)35485-35498
Number of pages14
JournalOptics Express
Issue number45
Publication statusPublished - 20 Nov 2019


Multispectral and 3-D imaging are useful for a wide variety of applications, adding valuable spectral and depth information for image analysis. Single-photon avalanche diode (SPAD) based imaging systems provide photon time-of-arrival information, and can be used for imaging with time-correlated single photon counting techniques. Here we demonstrate an LED based synchronised illumination system, where temporally structured light can be used to relate time-of-arrival to specific wavelengths, thus recovering reflectance information. Cross-correlation of the received multi-peak histogram with a reference measurement yields a time delay, allowing depth information to be determined with cm-scale resolution despite the long sequence of relatively wide (~10 ns) pulses. Using commercial LEDs and a SPAD imaging array, multispectral 3-D imaging is demonstrated across 9 visible wavelength bands.

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