Open AccessMultispectral time-of-flight imaging using light-emitting diodes
Author(s) -
Alexander D. Griffiths,
Haochang Chen,
David Li,
Robert K. Henderson,
Johannes Herrnsdorf,
Martin D. Dawson,
Michael J. Strain
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.035485
Subject(s) - multispectral image , optics , avalanche diode , photon counting , single photon avalanche diode , wavelength , spectral imaging , light emitting diode , image resolution , diode , photon , physics , remote sensing , materials science , detector , optoelectronics , avalanche photodiode , geology , breakdown voltage , quantum mechanics , voltage
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.