Patent ID: 8576212

Claim:
A billboard display system comprising: a screen; a plurality of cameras to captured images of a scene near the screen, wherein the scene is divided into a plurality of parts, each of the plurality of cameras captures images in at least one of the parts, one of the plurality of cameras is assigned with a reference line; a processing unit connected between the cameras and the screen; and a storage system connected to the processing unit and storing a plurality of programs to be executed by the processing unit, wherein the storage system comprises: a human detection module to check the images captured by the plurality of cameras to determine whether there is a person nearby the screen; a position detection module to check the images to determine a relative position of the person according to an angle between a line from a center of the person to a center of the screen and the reference line when there is a person nearby the screen; and a controlling module to control a media to be shown at a corresponding position of the screen according to the relative position of the person to the screen.