A method of simultaneously displaying a passing person and his/her message on the same screen space

The widespread use of smartphones has prompted the provision of a variety of services that exploit sensors installed in the smartphones, such as GPS, and augmented reality (AR). This paper proposes a method in which a user of such a smart terminal receives a message from a person passing by, and has the message displayed alongside the image of that person on the screen of the camera installed in the user´s terminal. Specifically, the paper proposes a gravity center method that calculate the positions of the user and the passing person taking errors in the GPS measurements into consideration, and a method of displaying the message sent by the other person at a position on the camera screen calculated from the position data sent by the other person´s terminal. These methods have been implemented in Android terminals, and the effectiveness of these methods has been evaluated.