Hacker Cinema
The Tube
2012 · TV series · documentary · 60 min episodes · 1 season
Created by Rowan Deacon, Danny Horan
The Tube is a 2012 documentary television series produced by Blast! Films for the BBC. It follows the staff and passengers of the London Underground as it underwent the biggest upgrade in its history. It premiered on BBC Two on 20 February 2012 for a six-week run.
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I saw a video / TV program where they talked about it a few years back... possibly in the BBC series called "The Tube"(2012)[0].
As I recall it wasn't doing actual facial recognition, but object / shape recognition, and comparing the objects in an area over time. So you'd have the outline of a person sitting on a bench and if they're still there after all destinations served by that platform (obviously depending on the line) have had at least one train, it'd be flagged up as suspicious as apparently some jumpers like to contemplate first.
Of course there must be a fair few false positives - people waiting to meet friends to either travel together or head out maybe etc, heck - I've even met someone to buy a laptop on a tube platform before... and I don't know how well it would cope if the person moved about between trains - but that didn't seem to matter much for their use case, and I'm sure they must have better tech in place by now.
Sorry I can't be more precise with a source, but I'll let you know if I find anything helpful.
[0] http://www.bbc.co.uk/programmes/b01cmsfd/episodes/guide