Abstract: A public advertising system uses sensors at each public display to gather characteristics of audiences at each of multiple locations. In one implementation, the system compiles the audience characteristics into an audience distribution model. The audience distribution model matches advertising content to audiences and also selects locations, times, and durations for creating distribution strategies. Such distribution strategies provide advertisers with a cost-effective business tool. The system can also match advertising to target features of an audience in real time. In one implementation, computer vision and speech recognition provide rigorous analysis of audience characteristics.