As the electronic advance techniques, computing machines have been matured and smart phones are equipped with powerful processors and large memories. In the consequence, various services become available on smart phones. Since a smart phone is a personal belonging, it is an excellent candidate device on which a context-aware service is provided. As an example context-aware service on smart phones, we have picked the campus guide. The campus guide consists of the server and the client. The main features of the client include determining the object and the user will get the complete information related to that object.
The service scenario of our campus guide is summarized as follows:
1) When the application is first downloaded by a user, the application takes the user’s personal information and saves it in the database.
2) When the user starts running the application, it renders the campus map.
3) When the photo of any object taken, it recognizes it.
4) It displays the picture along with a text showing some information about the picture.
5) It plays the video to give information of the object.
6) After playing a video, it goes back to step 2.