I don't know about small, but the store I usually shop at is owner-operated (though part of a owner-coop in Germany), but they don't do it. I get the point of

I don't know about small, but the store I usually shop at is owner-operated (though part of a owner-coop in Germany), but they don't do it. I get the point of shoplifting watchers not caring about queues, but am I just naive that this should be easy enough to solve with tech? You have lots of images from multiple directions, you know how the store looks empty, you can probably do a decent-enough image discovery to find out roughly where people are. If there are 15 people in front of the checkout, ring a small bell somewhere and have a person check whether it's time to open another checkout. I can shop, scan the products while I walk through the shop with my phone, pay with the app and open a gate to bet let out with my purchased goods, but the computer can't use the camera signal to figure out how where people are?