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Yes, this has been under consideration when thinking just how much raw footage would have to be stored for 4 or more self-checkout cameras for every shop. Probably multiple terabytes per day, per chain, just for London. There is also the classic 'plastic camera with blinking LED' CCTV installation, intended to deter theft in a more lo-fi manner.

As an aside, the artist John Baldessari made an installation in the Tate Modern where you were filmed walking into a room and the image was projected on the wall, but with about a 10 second delay, so that the feedback loop between seeing yourself 'on screen' and being able to influence it was completely broken. It was quite interesting to experience.

by Dylan1680713 hours ago|

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Terabytes for an entire chain isn't that much, actually?

Here's a good reference point: if you have one hard drive per camera, and record at 1Mbps, you can store 5 years of footage.

by Normal_gaussian13 hours ago|

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About 8 or 9 years ago I saw a self checkout pos provider demo a camera/screen system that would do basic images processing constantly to try and take pictures when people are clearly visible. A couple of low res, low colour palette, cropped images per user are much much easier to store. This was at a security conference.

by windowliker13 hours ago|

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Fair enough, sounds like a reasonable compromise, but I still question the entire premise of having these cameras in the first place, especially since they do not film the area where items are being handled. Tallying a loss of stock to a specific person would seem to be really quite difficult to do with only a set of photographs of the faces of everyone who utilised the self-checkouts within a certain period.

by Normal_gaussian1 hours ago|

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Which is again, a fair question with a reasonable answer:

Stores have loss 'prevention' (more like tracking) software which the security team can use. They are able to attach images of people stealing, but its hard to identify a person from a camera 15ft away when they are bent over a shelf; so they attach images of them stealing and of them passing through choke points - e.g. checkouts and entrances.

Tying them together is laborious, and is currently in its own little model rush - it's a technique called re-identification.

However, the next question is why doesn't it happen in practice? Well the stores have found police to be uniquely annoying on that they won't arrest and the state won't prosecute despite clear evidence.

by bjourne12 hours ago|

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You only need 3-5 fps SD video and with motion sensing you only record when there is a customer at the self-checkout. Technically, it is absolutely doable.