My understanding of these systems is that the green box just detects a face to a) make it easier to scan hours of footage later looking for faces b) add a subtle intimidation factor against crime.
Is a picture of a face count as "biometric" information? I strongly doubt it and suspect this case will be thrown out.
Yes I think it is likely security theatre - "smile you're on camera!" type things.
In some stores here in the UK they have CCTV with a sort of attention getting dancing LED light ring around the lens which I assume is there to a) trick you into looking straight at it (and so get a clear shot of your face) and b) remind people that cameras are there doing something.
I highly doubt they stopped there. If they're doing that already, they're taking the time/expense to scan hours of footage later and they would absolutely go further and assign each face a risk score based on what they think happened during your visits. They will flag you next time so the LP person can know to watch you closer in real time. I personally don't think they are sitting on evidence to charge you with a bigger crime later like some comments suggest, but I do think they would like to know which of the 10 busy self-checkout registers are most important to watch in real time at any given moment.
It’s “face detection blocking” built into the camera/display. Otherwise, the video footage is just straight sent as ONVIF to the main DVR for whatever processing is done there (which could be a lot more nefarious).
Wren Solutions / Costar seem to be the main vendors of these “public view monitors” — such as the PVM10-B-2086.
https://6473609.fs1.hubspotusercontent-na1.net/hubfs/6473609...
“Face Detection Boxes (Neon Green, Front and Side Detection)”