Home > CCTV Security Camera & Video Surveillance System Forums > IP Camera Support > IP Camera Capabilities – Facial Recognition > Re: IP Camera Capabilities – Facial Recognition
There is a theory if you need to recognize somebody you know you should have at least 40 pixels/foot (vertical) and you need 60 pixels per foot in case if you want to identify somebody you don't know.
So if you have 1.3 Megapixel camera with 1/2" sensor format and 8 mm lens you are going to have 42 pixels/foot at 40 foot from camera and width of the field of view 31 ft.
If you need more (like 60 pixels/ft) you can put lens with higher lens focal length (12 mm, with 19.9ft) or put 3 Megapixel camera.
In case if you would have a 3Megapixel camera