People normally do this by scanning a 10mW 832nm laser with a mirror, according to Dan Gelbart in <a href="https://www.youtube.com/watch?v=0MtRxX0crjU" rel="nofollow">https://www.youtube.com/watch?v=0MtRxX0crjU</a>. The lecture is 77 minutes, covering nonlinear junction detectors, digital calipers, the US-embassy bug in Russia, laser microphones bounced off windows, and geometric errors from material relaxation. The bit about camera detectors is close to the end. Works for eyeballs too.<p>Lensless sensors (for example, using compressed sensing, or Hadamard shadow masks) can presumably defeat this, but also, watching from far enough away should defeat it. Hard to do that inside a pervert's AirBNB, though.
Until someone develops hidden cameras with AI that will be auto turned on couple of hours later after detecting presence at that time a scan was already performed and nothing was found.....
If this worked with IR, and so non visible, it might be even more useful.<p>Great idea though.
Walk around your neighborhood and see who has security cameras.<p>Security camera through PVS14
<a href="https://youtu.be/gEWniEhtE2k" rel="nofollow">https://youtu.be/gEWniEhtE2k</a>
But then you would need an IR camera instead of using the phone's camera. An IR camera should be able to find some hidden cameras passively by detecting a heat source.
Pining for the days when phones had IR blasters (e.g. galaxy s6); that would work perfectly for this
Why would that be more useful?
Perhaps to avoid tipping off the entity recording you by blasting their hidden cameras with bright lights. Granted, the PoC device in the article is not exactly subtly looking, but if you could turn it into a sleek device it would be more useful. Not playing your hand while you're under surveillance lets you control the information they're receiving.<p>Though the bigger issue with my theory is that while most cell phone and webcam devices have IR filters, many surveillance cameras intentionally do not.
If you're being surveilled in a way that you don't want to tip the observers is one thing, but if you're in an AirBnB type place, fuck 'em. I'd even be fine with running some lasers in the place that ruins the sensor.
Unless the hidden camera has IR capabilities.
I wonder if it works with smart glasses.
Cool, but we need that for microphones.
Yeah I don’t think this will be effective, cameras can be put in certain angles that it can see with being seen, or how police do it, entirely behind clothes or similar fabric where it can see through and identify but not seen even if you’re looking straight at it.