Hi,
I am trying to design a new system and need to include some externally mounted cameras. How can I determine if the cameras will be good enought for general surveillance without additional lighting without actually visiting the site at night? I am looking to use IP cameras and this is in a city park-like environment. Is there any rule of thumb that can be used?
For example, if a camera has a spec sheet that states the camera has a sensitivity of colour 0.12 lux and B/W 0.03 lux @ f1.2, what kind of performance would I expect in ambient light at night? The camera is a CMOS imager, mechanical IR filter, and the distance to the target image is about 20-m (using a fixed lens). Would I be able to recognise facial features or only that there was a person in the field of view (or worse nothing at all)?
Thanks.
