Image: The New York Times
The New York Times ran an experiment using a public video stream from Bryant Park in Midtown Manhattan. They collected publicly available photos of people that worked near the park and then ran one day's worth of footage from the public video stream through Amazon's commercial facial recognition service at the cost of approx $60. Over a nine hour period it detected 2,750 faces, including an 89% match of a college professor from his employer's website headshot.
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