August 2018
Spotlight Summary by Achuta Kadambi
Eavesdropping of display devices by measurement of polarized reflected light
Imagine you could eavesdrop on someone's cell phone by looking at subtle reflections off a nearby wall. This creative paper from the University of Arizona shows how one can form non-line-of-sight reconstructions of a polarized display. The Arizona researchers repurpose the edge overlap function in the new context of Stokes and Mueller calculus to efficiently separate multiple bounces of light. This work sets a foundation for future approaches that could implement advanced optimization or regularization strategies. While the technique does make assumptions on the polarization state of the occluded display, it turns out that displays used in cell phones, televisions, or computer monitors are typically polarized. It is not hard to envision future generalizations of this technique to reflection removal, eavesdropping, and—with continued progress—even non-line-of-sight imaging or localization.
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Article Information
Eavesdropping of display devices by measurement of polarized reflected light
Yitian Ding, Ronan Kerviche, Amit Ashok, and Stanley Pau
Appl. Opt. 57(19) 5483-5491 (2018) View: Abstract | HTML | PDF