Outdoor ads were banned for the industry in 2007, while tobacco ads on TV and radio have been outlawed since 1996.

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The world of digital outdoor ads is finite, unlike online ads.

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Once they had such a wealth of story to work with, Coca-Cola and its partners built the Happiness Factory into a franchise that includes videogames, apps and social networking campaigns, as well as TV, radio, online, outdoor and mobile ads.

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These kinds of quality images have disappeared over the last 10 years as newspapers and magazines, print ads and outdoor billboards have fallen apart and given way to digital platforms.

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Beyond just bringing metrics to outdoor advertisements, facial detection technology can tailor ads to people based on their features.

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It's smaller than Clear Channel Outdoor, now a separate company, which puts ads on 5, 000 taxicabs in New York City.

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