Cameras are getting smaller and we are all getting more paranoid, so you may want to do this one thing before checking into your short term rental. Using a phone and some inexpensive parts, researchers at KAIST [Korea Advanced Institute of Science and Technology] have developed a system for finding hidden cameras. Dubbed SweepLED, the hidden camera detector relies on the unique reflection from a camera lens. So far, the researchers report a 94% accuracy.
SweepLED works by keeping the smartphone camera fixed while changing only the direction of the LED illumination, then analyzing the patterns of reflected light that appear on object surfaces. Reflections from ordinary glossy objects tend to move or disappear depending on the direction of the light. In contrast, camera lenses show distinctive deformation patterns in their reflections due to their internal lens, aperture, and sensor structures.
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