Single-pixel detectors can be used as imaging devices by making use of structured illumination. These systems work by correlating a changing incident light field with signals measured on a photodiode to derive an image of an object. In this work we demonstrate a system that utilizes a digital light projector to illuminate a scene with approximately 1300 different light patterns every second and correlate these with the back scattered light measured by three spectrally-filtered single-pixel photodetectors to produce a full-color high-quality image in a few seconds of data acquisition. We utilize a differential light projection method to self normalize the measured signals, improving the reconstruction quality whilst making the system robust to external sources of noise. This technique can readily be extended for imaging applications at non-visible wavebands.
Welsh, S. S., Edgar, M. P., Bowman, R., Jonathan, P., Sun, B., & Padgett, M. J. (2013). Fast full-color computational imaging with single-pixel detectors. Optics Express, 21(20), 23068-23074. https://doi.org/10.1364/oe.21.023068