When I started reading the description, I thought: "someone finally delivered on that RFID pitch of just walking out of the store". Was surprised that it's actually computer vision.
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One reason I think the retailers took a step back from EPC was the general fear mongering and misinformation. In addition to the crazies calling them out as "the mark of the beast", there were numerous reports in the media about how walmart was going to start "putting computer tracking chips in all the pants they sold so they could track you wherever you went." I'm pretty sure they were also supposed to give you cancer and kill baby seals, too!