Not sure how it will work on the Apple platform, but on the Microsoft Surface platform, it works like this.
Windows Hello uses face recognitions and falls back to a PIN.
You walk up to a Surface, sit down and you're already logged in. It doesn't remove the splash screen though so anything you were working on is still private. You hit a key or swipe up to remove the splash screen. If you are not recognised, you just have to enter the PIN. You can train it for different light conditions, if you have glasses on etc. It seems to work by detecting IRIS and blood vessel patterns in and around the eyes. Sunglasses don't work.
On a Windows 10 Phone, it's similar in that you point the phone to your face and it logs you in. It can take a second or so - so that's one of the issues if time is a problem. Also - if the phone is on a desk, it can be awkward to look over the phone. This is why PIN is still available (and fingerprint on HP Elite x3).
After having used it for a couple of years, it's frankly, not that amazing. It works, you do get used to it but it seems to blend in. It is weird when I come back to the Mac - to have to enter a full password every time I want to log in but with Touch ID, I don't get that issue on iPad.
Windows Hello uses face recognitions and falls back to a PIN.
You walk up to a Surface, sit down and you're already logged in. It doesn't remove the splash screen though so anything you were working on is still private. You hit a key or swipe up to remove the splash screen. If you are not recognised, you just have to enter the PIN. You can train it for different light conditions, if you have glasses on etc. It seems to work by detecting IRIS and blood vessel patterns in and around the eyes. Sunglasses don't work.
On a Windows 10 Phone, it's similar in that you point the phone to your face and it logs you in. It can take a second or so - so that's one of the issues if time is a problem. Also - if the phone is on a desk, it can be awkward to look over the phone. This is why PIN is still available (and fingerprint on HP Elite x3).
After having used it for a couple of years, it's frankly, not that amazing. It works, you do get used to it but it seems to blend in. It is weird when I come back to the Mac - to have to enter a full password every time I want to log in but with Touch ID, I don't get that issue on iPad.