KennyR wrote:
...that webcams can see the IR LED on remote controls light up. Try it yourself - here it shows a whitish-purple. I can even see the LED lighting up nearby objects. It's totally invisible to the naked eye.
So...if I had an IR flashlight, I'd be able to 'see' in the dark with a normal webcam? Surely not...
Video cameras going way back can do that. The CMOS sensors are particularly acute in ir. I've often used the ol' video camera to check if the batteries in the remote are dead!
And indeed, if you had a bright enough IR source, you would be able to shoot in the dark and no-one would be aware how illuminated they are. CMOS detectors are so sensitive to IR, I believe that they usually have some kind of IR filter installed.
