Abstract: A system for authenticating a purchaser, collecting data of purchasers, and displaying personalized advertisements. The system uses video cameras to capture an initial image of the customer upon entry and/or at the register prior to checkout. The image is then sent via LAN or wireless LAN to a computer with image recognition software. The computer is connected to a credit card reader and to an in-store database where it can then be checked for a matching image. The database will then choose from a pool of advertisements to find one that matches the current customers shopping habits most accurately. The advertisement will then be projected onto a monitor in the customer's field of vision. At checkout, if the customer pays with a credit card, the information on the card will be sent to the computer where it will also be checked for a match in the database. The in-store database is connected with a larger central database which shares all recorded information with all stores.