Digital Signage Federation has adopted privacy standards for its members and affiliates. RFID and Bluetooth are other commons ways for digital signage systems to increase the effectiveness of targeting ads. One type of vending machine uses facial recognition software to suggest a drink after identifying customers by age and gender. Microsoft and Intel showed off a 7-foot-6-inch billboard with a camera and two displays at CES. Microsoft, Intel and Intel have shown off a billboard with two displays and a camera at CES. It can recognize consumers as male or female to present products and send a map to the store and a coupon to that consumer’s smartphone.”]
Source: https://www.csoonline.com/article/2228525/digital-signage–privacy-in-a–one-way-mirror-society-.html