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for the understanding
In the production of image sensors, each sensor Day-light and IR-light(with little wavelengh spektrum).
In the last step, a filter decides whether Day-light or IR-light sensor.
Many of the security surveillance cameras (PTZ IP-Cams) have a mechanical filter, which is controlled by a light-resistant.
Day = IR filter (IR-Cut)
Night = Daylight filters
see here
see also Aunt Google: DIY modify webcam as ir-cam
by the way, i have an old WiFi PTZ Cam, time to destroy it an look inside ...
have a nice day/night
Mike
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