As I understand it facial recognition only works that way on tv. Facial recognition is still hugely computationally expensive. In the real world it's used by se

As I understand it facial recognition only works that way on tv. Facial recognition is still hugely computationally expensive. In the real world it's used by security services by having a good picture of known bad guy x and then having the system watch cctv in a couple of zones to try to spot him. Even that takes hella cpu time, but it's still matching only a small fraction of the faces... thousands vs. Hundreds of millions.