One part of my current project involves some kind of "surveillance awareness", so I'd like to implement a camera detector.
Since this is for an artistic project, it doesn't need to be EXTREMELY precise or accurate...
So I've been thinking about possibilities to detect the presence of a camera. So far I've come with two ideas:
1) Use en EMF detector with a filter for the frequencies of the CCDs, which are more or less the same in the short wave band spectrum (from 15 to 20 MHz I suppose) and then use the amplitude (probably measured via proximity to the detector) to trigger something out of Arduino (blink an LED, for instance. This doesn't matter for now)
2) Use a visual-oriented detection: if you shoot a beam of red light in a room while observing it through a red color filter, the CCDs/lenses tend to blink in response (there are a few commercial gadgets that do exactly this). But this would get complicated, since I would have to calibrate a color sensor precisely to retrieve accurate data, i.e. distinguish between different red brightness (the filter and the blinking).
one alternative to solution 2 would be without any Arduino board, just by hooking up a webcam to a computer and doing the point detection via Processing or PD/GEM. This would be my last try, since I'd like to keep things disconnected from a computer.
so far the number one, although quite tricky, would be the best possibility. I'm trying to keep the complexity to a minimum in this project.
would you have any other interesting and/or more feasible suggestions?