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

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

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
29 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)35485-35498
Number of pages14
JournalOptics Express
Issue number24
Publication statusPublished - 25 Nov 2019


  • SPAD
  • light-emitting diode
  • imaging
  • time-of-flight


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