Whereas advertisers were once happy simply to place posters for doughnuts near police stations, they now insist on knowing who is viewing their adverts. Companies such as Quividi, a French marketing technology firm, are happy to oblige.
Quividi installs camera systems in billboards and a computer analyses passers-by. “We know this many people have walked in front of the screen, how many turned to face the ad, and how long they looked at it,”
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