Sushi Train Interface: Passive and Interactive Information Sharing
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We proposed sushi train interface as a novel information sharing method to have users notice everyday information in a natural manner. In the interface, information rails are projected on ceilings or walls, and information dishes go around on the rails. Users interact with the information rails using remote pointing devices. We constructed a prototype as a proof-of-concept and implemented pointing methods by a camera device and a smart laser pointer. The both methods are expected to be used for interacting information rails.
KeywordsSushi train Information sharing Pointing method Passive attitude Smart laser pointer
Up until a decade ago, physical bulletin boards had been a primary information sharing method for groups at offices, schools, and so on. Now it is changing to digital information sharing systems as their alternatives. Their primary advantage is that people can access information from everywhere. However, their chances are limited to the time when people operate computers or electric devices. Moreover, people must check them intentionally. This is disadvantage as compared to physical bulletin boards usually installed in such places that people naturally notice.
Therefore, there is the necessity of a new information sharing method which can be used by users with a passive attitude. Watanabe proposed a new visual interface focusing the advantage of passiveness . It is intended to show useful information in idle times on a PC. However, it might be a small amount of time to look such information on PCs considering the whole time of their daily life.
Our proposal is to share information with the style of sushi train (or rotating sushi bar) in real space. One reason of sushi train’s popularity is that people can find their favorite dishes easily in a passive attitude by watching moving showcase (i.e. sushi trains). So we applied the model of sushi train to information sharing and constructed a prototype as a proof-of-concept. In the prototype, information rails are projected on ceiling and walls, and information dishes go around there. People interact with the information rails using remote pointing devices.
2 Sushi Train Interface
We constructed the prototype of sushi train interface. The prototype consists of two projectors, two PCs, a digital still camera (Android-powered COOLPIX S800c), a high-speed camera (DITECT HAS-L2), and two smart laser pointers developed by us. As for the software modules of the prototype, SushiController displays information rails and dishes with projectors, InteractionManager deals with ‘put’ and ‘get’ interaction by exchanging messages using network, and RailEditor designs the rail layout based on 3D measurement of ceilings and walls.
3.1 Interaction Using Cameras
3.2 Interaction Using Smart Laser Pointers
The interaction method with cameras is a little awkward because people usually don’t aim cameras at ceilings. As a more intuitive pointing method, we employ smart laser pointers, which has the ability to encode ID with blinking pattern. A global high-speed camera recognizes the gesture and identifies the device. We combined some methodologies for laser pointer interaction proposed so far, such as .
By making a circular stroke, a user can select an information dish inside the circle. Then InteractionManager detects the gesture and the ID, and sends the selected dish to the digital device linked with the ID.
We proposed sushi train interface as a novel interaction method to share information in a group. The method can effectively utilize huge display areas of ceilings and walls. Users can feel a sense of unity of the environment by sharing same information presentation through real space. We also proposed two pointing methods to interact such information. We haven’t any quantitative evaluation, but smart laser pointer has more natural style to point information and it is also advantageous to know which information others have interests in. As for future work, it is useful to employ some concepts of real sushi train and reflect them to the interface (e.g. changing contents color based on the freshness of information).
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