Getting enough resolution for face recognition gets very expensive very quickly
http://www.axis.com/academy/identification/resolution.htm
You're looking at multi-megapixel cameras at least, potentially even higher resolution if the cameras need to cover a wide area.
http://www.axis.com/academy/identification/resolution.htm
You're looking at multi-megapixel cameras at least, potentially even higher resolution if the cameras need to cover a wide area.