Our graduate student Chuan Qin and Prof. Srihari Nelakuditi in collaboration with Systems and Networking Research Group at Duke University developed a system called TagSense for tagging photos taken with smartphones. TagSense leverages multiple sensors on smartphones carried by people to identify them in a picture and tag it with their names and activities. Articles about TagSense appeared in media outlets such as Popular Science. Visit here for more information on TagSense.