Real-time advertisement based on common point of attraction of different viewers

A system comprising:

• one or more cameras;
• a processor;
• and
• a monitoring apparatus executing at least partially on the processor, the monitoring apparatus comprising
• a focal direction module that uses the one or more cameras to determine a direction of focus of attention of a plurality of persons by determining a direction of the head of each person of the plurality of persons, the plurality of persons located in a vicinity of a plurality of products;
• a focus extrapolation module that extrapolates the direction of focus for each person of the plurality of persons;
• a product focus module that determines, for each product of the plurality of products, a number of persons of the plurality of persons that have a direction of focus on the product, the determination based on the extrapolated direction of focus for each person;
• a ranking module that ranks each product based on the number of persons with a direction of focus on a product of the plurality of products;
• and
• an advertising module that displays an advertisement in view of at least a portion of the one or more persons, content of the advertisement based on the ranking by the ranking module.